Equipment and Calibration

Equipment history at Vaira

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SELECT a.recno, a.eh_date, a.eh_loc1, a.eh_loc2, IF(a.eh_loc2=:loc, a.eh_locref2, a.eh_locref1) AS ref, a.eh_locref2, a.eh_title, a.eh_notes, a.eh_id, b.serialno, b.equip, b.modelno FROM equiphist a INNER JOIN equiplist b ON a.eh_id=b.recno WHERE (a.eh_loc1=:loc1 OR a.eh_loc2=:loc2) AND b.equip=:eq ORDER BY b.serialno, a.eh_date

Date	Serial No.	Model	Action	Ref	Notes
Gas Analyzer
2000-11-04	0035	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira tower to replace sn 0042 for calibration: H2O = 0-1000mmol/m3, CO2 = 10-25mmol/m3
2004-04-07	0035	LI-7500A	Calibration	Lab	Calibrated in the lab after being recently returned from Licor. There is a change in the power wiring. Red/white is positive, green is negative. They also changed the delay to 240 ms.
2000-11-04	0035	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira tower to replace existing 7500 sn 0042 for calibration: H2O = 0-1000mmol/m3, CO2 = 10-25mmol/m3
2004-04-07	0035	LI-7500A	Calibration	Lab	Calibrated in the lab after being recently returned from Licor. There is a change in the power wiring. Red/white is positive, green is negative. They also changed the delay to 240 ms.
2002-02-28	0035	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0065 for calibration.
2004-04-07	0035	LI-7500A	Calibration	Lab	Calibrated in the lab after being recently returned from Licor. There is a change in the power wiring. Red/white is positive, green is negative. They also changed the delay to 240 ms.
2003-10-02	0035	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0073 for calibration.
2004-04-07	0035	LI-7500A	Calibration	Lab	Calibrated in the lab after being recently returned from Licor. There is a change in the power wiring. Red/white is positive, green is negative. They also changed the delay to 240 ms.
2014-03-18	0035	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira tower to replace sn 0041 for calibration.
2014-09-09	0035	LI-7500A	Calibration	Lab	Last calibration: 2014-03-17 AGC=50 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.49kPa, Tair=23.33C, Tdew=13.88C Zero Air at 1000psi, God CO2 421.22 at 1300 Tdewspan=15.25 CO2 zero 0.9389 -> 0.9386 Offset: -1.05ppm CO2 span 1.0139 -> 1.0181 Offset: -3.02ppm H2O zero 0.8932 -> 0.8957 Offset: 20ppm H2O span 0.9462 -> 0.9838 Offset: -0.79ppm Notes: The signal seems a little noisy: +-1ppm CO2 and +-20mmol/m3 H2O
2014-06-25	0035	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira tower for calibration. Replaced by sn 0073.
2014-09-09	0035	LI-7500A	Calibration	Lab	Last calibration: 2014-03-17 AGC=50 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.49kPa, Tair=23.33C, Tdew=13.88C Zero Air at 1000psi, God CO2 421.22 at 1300 Tdewspan=15.25 CO2 zero 0.9389 -> 0.9386 Offset: -1.05ppm CO2 span 1.0139 -> 1.0181 Offset: -3.02ppm H2O zero 0.8932 -> 0.8957 Offset: 20ppm H2O span 0.9462 -> 0.9838 Offset: -0.79ppm Notes: The signal seems a little noisy: +-1ppm CO2 and +-20mmol/m3 H2O
2014-09-11	0035	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira tower to replace sn 0073 for calibration.
2015-04-06	0035	LI-7500A	Calibration	Lab	Last calibration: 2014-09-09 AGC=49 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.34kPa, Tair=18.40C, Tdew=4.37C Zero Air at 900psi, God CO2 421.22 at 1200 Tdewspan=15.97 CO2 zero 0.9386 -> 0.9389 Offset: 1.0ppm CO2 span 1.0181 -> 1.0257 Offset: -4.02ppm H2O zero 0.8957 -> 0.8939 Offset: -10.0ppm H2O span 0.9838 -> 0.9664 Offset: 0.33ppm Notes: The H2O span was unstable. Adding water to the dew point generator seemed to improve the situation but still variable.
2015-01-07	0035	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removes from the Vaira Tower for calibration. Replaced by sn 0976
2015-04-06	0035	LI-7500A	Calibration	Lab	Last calibration: 2014-09-09 AGC=49 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.34kPa, Tair=18.40C, Tdew=4.37C Zero Air at 900psi, God CO2 421.22 at 1200 Tdewspan=15.97 CO2 zero 0.9386 -> 0.9389 Offset: 1.0ppm CO2 span 1.0181 -> 1.0257 Offset: -4.02ppm H2O zero 0.8957 -> 0.8939 Offset: -10.0ppm H2O span 0.9838 -> 0.9664 Offset: 0.33ppm Notes: The H2O span was unstable. Adding water to the dew point generator seemed to improve the situation but still variable.
2017-05-11	0035	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 75H-2150.
2017-09-05	0035	LI-7500A	Calibration	Lab	Last calibration: 2017-05-08 AGC=99.8 SDM=0 DAC1=0 DAC2=0 Ambient P=100.4kPa, Tair=29.1C, Tdew=18.4C Zero Air at 1000psi, AMP Air 408.97 at 2100 Tdewspan=16.00 CO2 zero 0.9381 -> .9373 Offset: -3.34ppm CO2 span 1.023 -> 1.0084 Offset: 7.67ppm H2O zero 0.8974 -> .8976 Offset: .8ppm H2O span 1.0261 -> 1.0141 Offset: .25ppm Notes:
2017-08-17	0035	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira Tower for calibration. Replaced by sn 75H-2514.
2017-09-05	0035	LI-7500A	Calibration	Lab	Last calibration: 2017-05-08 AGC=99.8 SDM=0 DAC1=0 DAC2=0 Ambient P=100.4kPa, Tair=29.1C, Tdew=18.4C Zero Air at 1000psi, AMP Air 408.97 at 2100 Tdewspan=16.00 CO2 zero 0.9381 -> .9373 Offset: -3.34ppm CO2 span 1.023 -> 1.0084 Offset: 7.67ppm H2O zero 0.8974 -> .8976 Offset: .8ppm H2O span 1.0261 -> 1.0141 Offset: .25ppm Notes:
2019-11-19	0035	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 75H-2180 for calibration.
2020-02-19	0035	LI-7500A	Calibration	Lab	Last calibration: 2019-11-18 AGC=100 SDM= DAC1= DAC2= Ambient P=100.95kPa, Tair=25.6C, Tdew=8.3C Zero Air at 800psi, AMP CA4396 408.97 at 550 Tdewspan=16.00 CO2 zero 0.9374 -> .9373 Offset: -.29ppm CO2 span 1.017 -> 1.0158 Offset: .43ppm H2O zero 0.898 -> .8981 Offset: .4ppm H2O span 1.0314 -> 1.0246 Offset: .14ppm Notes:
2020-02-12	0035	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0073.
2020-02-19	0035	LI-7500A	Calibration	Lab	Last calibration: 2019-11-18 AGC=100 SDM= DAC1= DAC2= Ambient P=100.95kPa, Tair=25.6C, Tdew=8.3C Zero Air at 800psi, AMP CA4396 408.97 at 550 Tdewspan=16.00 CO2 zero 0.9374 -> .9373 Offset: -.29ppm CO2 span 1.017 -> 1.0158 Offset: .43ppm H2O zero 0.898 -> .8981 Offset: .4ppm H2O span 1.0314 -> 1.0246 Offset: .14ppm Notes:
2024-01-02	0035	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0065 for calibration
2024-04-15	0035	LI-7500A	Calibration	Lab	Last calibration: 2024-01-02 AGC=100.7 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.96kPa, Tair=22.82C, Tdew=9.50C Zero Air at 300psi, AMP CA04119 524.77 at 550 Tdewspan=20.00 CO2 zero 0.9372 -> .9377 Offset: -.4ppm CO2 span 1.0267 -> 1.0226 Offset: .98ppm H2O zero 0.9006 -> .8987 Offset: -11.1ppm H2O span 1.04 -> 1.0279 Offset: -.16ppm Notes: H2O zero was drifting up after stabilizing, but CO2 zero ok. Maybe we need to change the internal chemicals next time? I redid the H2O zero point after finishing the rest of the calibration. The offset changed from 0.8969 to 0.8987 (tiny change). Used 524.65 as span point in the software for post-span CO2 value to be around 524.77.
2024-03-26	0035	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0042.
2024-04-15	0035	LI-7500A	Calibration	Lab	Last calibration: 2024-01-02 AGC=100.7 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.96kPa, Tair=22.82C, Tdew=9.50C Zero Air at 300psi, AMP CA04119 524.77 at 550 Tdewspan=20.00 CO2 zero 0.9372 -> .9377 Offset: -.4ppm CO2 span 1.0267 -> 1.0226 Offset: .98ppm H2O zero 0.9006 -> .8987 Offset: -11.1ppm H2O span 1.04 -> 1.0279 Offset: -.16ppm Notes: H2O zero was drifting up after stabilizing, but CO2 zero ok. Maybe we need to change the internal chemicals next time? I redid the H2O zero point after finishing the rest of the calibration. The offset changed from 0.8969 to 0.8987 (tiny change). Used 524.65 as span point in the software for post-span CO2 value to be around 524.77.
2001-03-22	0041	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0065 for calibration.
2009-04-02	0041	LI-7500A	Calibration	Lab	AGC = 56%, T = 24.1C, P = 100.0kPa N2 tank 1200psi, CO2 tank 1400psi 344.95ppm CO2 Last Calibration 1/7/2009 CO2 zero = 1.0024 -> 1.0026 CO2 span = 0.9868 -> 0.9872 H2O zero = 1.1031 -> 1.0377 H2O span = 0.7331 -> 0.7316
2001-11-10	0041	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Tonzi-Tower for calibration. Replaced by sn 0042.
2009-04-02	0041	LI-7500A	Calibration	Lab	AGC = 56%, T = 24.1C, P = 100.0kPa N2 tank 1200psi, CO2 tank 1400psi 344.95ppm CO2 Last Calibration 1/7/2009 CO2 zero = 1.0024 -> 1.0026 CO2 span = 0.9868 -> 0.9872 H2O zero = 1.1031 -> 1.0377 H2O span = 0.7331 -> 0.7316
2004-04-07	0041	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0065 for calibration
2009-04-02	0041	LI-7500A	Calibration	Lab	AGC = 56%, T = 24.1C, P = 100.0kPa N2 tank 1200psi, CO2 tank 1400psi 344.95ppm CO2 Last Calibration 1/7/2009 CO2 zero = 1.0024 -> 1.0026 CO2 span = 0.9868 -> 0.9872 H2O zero = 1.1031 -> 1.0377 H2O span = 0.7331 -> 0.7316
2009-01-08	0041	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira tower to replace sn 0073 for calibration
2009-04-02	0041	LI-7500A	Calibration	Lab	AGC = 56%, T = 24.1C, P = 100.0kPa N2 tank 1200psi, CO2 tank 1400psi 344.95ppm CO2 Last Calibration 1/7/2009 CO2 zero = 1.0024 -> 1.0026 CO2 span = 0.9868 -> 0.9872 H2O zero = 1.1031 -> 1.0377 H2O span = 0.7331 -> 0.7316
2012-07-25	0041	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira Tower to replace sn 0042 for calibration.
2013-01-29	0041	LI-7500A	Calibration	Lab	Last calibration: 2012-07-24 AGC=52 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=101.65kPa, Tair=25.10C, Tdew=4.63C Zero air at 1700psi, CO2 in air 392.3 at 2000 Tdewspan=15.07 CO2 zero 1.0008 -> 1.0012 Offset: 1.35ppm CO2 span 1.0084 -> 1.0080 Offset: 0.3ppm H2O zero 0.8201 -> 0.8220 Offset: 10.8ppm H2O span 0.9947 -> 0.9980 Offset: 0.0ppm Notes: Very tight correspondence with last calibration
2012-10-24	0041	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira Tower for calibration. Replaced by 0418
2013-01-29	0041	LI-7500A	Calibration	Lab	Last calibration: 2012-07-24 AGC=52 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=101.65kPa, Tair=25.10C, Tdew=4.63C Zero air at 1700psi, CO2 in air 392.3 at 2000 Tdewspan=15.07 CO2 zero 1.0008 -> 1.0012 Offset: 1.35ppm CO2 span 1.0084 -> 1.0080 Offset: 0.3ppm H2O zero 0.8201 -> 0.8220 Offset: 10.8ppm H2O span 0.9947 -> 0.9980 Offset: 0.0ppm Notes: Very tight correspondence with last calibration
2013-11-27	0041	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira tower to replace sn 0418 for calibration
2014-06-04	0041	LI-7500A	Calibration	Lab	Last calibration: 2013-11-20 AGC=51 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.11kPa, Tair=21.17C, Tdew=11.50C Zero Air at 1250psi, God CO2 421.22 at 1500 Tdewspan=15.27 CO2 zero 0.9984 -> 1.0009 Offset: 8.18ppm CO2 span 1.0139 -> 1.0101 Offset: 2.03ppm H2O zero 0.8224 -> 0.8235 Offset: 6.5ppm H2O span 0.9991 -> 1.0013 Offset: -0.05ppm Notes: Both the CO2 and H2O span seemed a little less stable that usual - CO2 +-0.2ppm, H2O +-0.5C
2014-03-18	0041	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira tower for calibration. Replaced by sn 0035.
2014-06-04	0041	LI-7500A	Calibration	Lab	Last calibration: 2013-11-20 AGC=51 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.11kPa, Tair=21.17C, Tdew=11.50C Zero Air at 1250psi, God CO2 421.22 at 1500 Tdewspan=15.27 CO2 zero 0.9984 -> 1.0009 Offset: 8.18ppm CO2 span 1.0139 -> 1.0101 Offset: 2.03ppm H2O zero 0.8224 -> 0.8235 Offset: 6.5ppm H2O span 0.9991 -> 1.0013 Offset: -0.05ppm Notes: Both the CO2 and H2O span seemed a little less stable that usual - CO2 +-0.2ppm, H2O +-0.5C
2015-04-21	0041	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira tower to replace sn 0976 for calibration.
2015-10-28	0041	LI-7500A	Calibration	Lab	Last calibration: 2015-04-20 AGC=51 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.68kPa, Tair=21.33C, Tdew=13.66C Zero Air at 750psi, God CO2 421.22 at 750 Tdewspan=11.08 CO2 zero 1.0002 -> 1.0004 Offset: 0.68ppm CO2 span 1.0115 -> 1.0107 Offset: 0.38ppm H2O zero 0.8243 -> 0.8247 Offset: 2.3ppm H2O span 0.9991 -> 0.8836 Offset: 1.96ppm Notes:
2015-07-20	0041	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0976
2015-10-28	0041	LI-7500A	Calibration	Lab	Last calibration: 2015-04-20 AGC=51 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.68kPa, Tair=21.33C, Tdew=13.66C Zero Air at 750psi, God CO2 421.22 at 750 Tdewspan=11.08 CO2 zero 1.0002 -> 1.0004 Offset: 0.68ppm CO2 span 1.0115 -> 1.0107 Offset: 0.38ppm H2O zero 0.8243 -> 0.8247 Offset: 2.3ppm H2O span 0.9991 -> 0.8836 Offset: 1.96ppm Notes:
2015-11-03	0041	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira Tower to replace sn 0976 for calibration.
2016-05-05	0041	LI-7500A	Calibration	Lab	Last calibration: 2015-10-28 AGC=50 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.03kPa, Tair=19.99C, Tdew=9.10C Zero Air at 600psi, God CO2 421.22 at 500 Tdewspan=11.09 CO2 zero 1.0004 -> 1.0002 Offset: -0.7ppm CO2 span 1.0107 -> 1.0128 Offset: -1.12ppm H2O zero 0.8247 -> 0.8257 Offset: 5.0ppm H2O span 0.8836 -> 1.0037 Offset: -2.5ppm Notes: Large offset in H2O span. I think a mistake was made last time when the dew point was set to the H2O mmol/mol value.
2016-02-23	0041	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira tower for calibration. Replaced by sn 0976.
2016-05-05	0041	LI-7500A	Calibration	Lab	Last calibration: 2015-10-28 AGC=50 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.03kPa, Tair=19.99C, Tdew=9.10C Zero Air at 600psi, God CO2 421.22 at 500 Tdewspan=11.09 CO2 zero 1.0004 -> 1.0002 Offset: -0.7ppm CO2 span 1.0107 -> 1.0128 Offset: -1.12ppm H2O zero 0.8247 -> 0.8257 Offset: 5.0ppm H2O span 0.8836 -> 1.0037 Offset: -2.5ppm Notes: Large offset in H2O span. I think a mistake was made last time when the dew point was set to the H2O mmol/mol value.
2016-12-07	0041	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira Tower to replace sn 0042 for calibration.
2017-05-05	0041	LI-7500A	Calibration	Lab	Last calibration: 2016-12-05 AGC=99.9 SDM= DAC1= DAC2= Ambient P=100.2kPa, Tair=22.7C, Tdew=9.22C Zero Air at 1600psi, LBL Air 513.22 at 400 Tdewspan=16.00 CO2 zero 1.0004 -> .9969 Offset: -11.7ppm CO2 span 1.0124 -> 1.0177 Offset: -3.72ppm H2O zero 0.8255 -> .8210 Offset: -25.0ppm H2O span 1 -> 1.0320 Offset: -.69ppm Notes: First calibration since upgrade from LI-7500 to LI-7500A
2017-04-10	0041	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0073.
2017-05-05	0041	LI-7500A	Calibration	Lab	Last calibration: 2016-12-05 AGC=99.9 SDM= DAC1= DAC2= Ambient P=100.2kPa, Tair=22.7C, Tdew=9.22C Zero Air at 1600psi, LBL Air 513.22 at 400 Tdewspan=16.00 CO2 zero 1.0004 -> .9969 Offset: -11.7ppm CO2 span 1.0124 -> 1.0177 Offset: -3.72ppm H2O zero 0.8255 -> .8210 Offset: -25.0ppm H2O span 1 -> 1.0320 Offset: -.69ppm Notes: First calibration since upgrade from LI-7500 to LI-7500A
2000-10-07	0042	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed with the initial set up of the Vaira site. D/A settings: H2O 0-1000 mmol/m3, CO2 13-20 mmol/m3
2000-10-12	0042	LI-7500A	Calibration	Lab	Zero with N2 was 2.0, after running several weeks in the lab.Cal gas 402.25 read 411.1 ppm at P=101.31 kPa and T 23.17 C. Licor Dewpoint sensor read 14.57 Tdew. Vaisala standard read 13.9 C. We are using the Vaisala as the standard for the experiment. Rezeroed and spanned D/A #1, H2O mmol m-3 0v=0 5 v=1000 D/A #2, CO2 mmol m-3 0v=13 mmol m-3 5v=20 mmol m-3
2000-11-05	0042	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed for calibration. Replaced by sn 0035
2004-04-07	0042	LI-7500A	Calibration	Lab	Calibrated in the lab after being recently returned from Licor. There is a change in the power wiring. Red/white is positive, green is negative. They also changed the delay to 240 ms.
2000-11-19	0042	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira tower to replace existing 7500 sn 0035 for calibration: H2O 0-1000 mmol/m3, CO2 13-20 mmol/m3
2004-04-07	0042	LI-7500A	Calibration	Lab	Calibrated in the lab after being recently returned from Licor. There is a change in the power wiring. Red/white is positive, green is negative. They also changed the delay to 240 ms.
2000-12-14	0042	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira tower to replace sn 0035 for calibration: H2O = 0-1000mmol/m3, CO2 = 13-20mmol/m3.
2004-04-07	0042	LI-7500A	Calibration	Lab	Calibrated in the lab after being recently returned from Licor. There is a change in the power wiring. Red/white is positive, green is negative. They also changed the delay to 240 ms.
2001-11-10	0042	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Tonzi to replace sn 0041 for calibration.
2004-04-07	0042	LI-7500A	Calibration	Lab	Calibrated in the lab after being recently returned from Licor. There is a change in the power wiring. Red/white is positive, green is negative. They also changed the delay to 240 ms.
2002-04-18	0042	LI-7500A	Location	Gas Analyzer CO2/H2O	Tried to swap out for calibration but replacement (sn 0073) was reading out of range. Left in place
2004-04-07	0042	LI-7500A	Calibration	Lab	Calibrated in the lab after being recently returned from Licor. There is a change in the power wiring. Red/white is positive, green is negative. They also changed the delay to 240 ms.
2002-05-09	0042	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0065.
2004-04-07	0042	LI-7500A	Calibration	Lab	Calibrated in the lab after being recently returned from Licor. There is a change in the power wiring. Red/white is positive, green is negative. They also changed the delay to 240 ms.
2002-07-19	0042	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0073 for calibration.
2004-04-07	0042	LI-7500A	Calibration	Lab	Calibrated in the lab after being recently returned from Licor. There is a change in the power wiring. Red/white is positive, green is negative. They also changed the delay to 240 ms.
2002-08-15	0042	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0418.
2004-04-07	0042	LI-7500A	Calibration	Lab	Calibrated in the lab after being recently returned from Licor. There is a change in the power wiring. Red/white is positive, green is negative. They also changed the delay to 240 ms.
2002-09-20	0042	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0418 for calibration.
2004-04-07	0042	LI-7500A	Calibration	Lab	Calibrated in the lab after being recently returned from Licor. There is a change in the power wiring. Red/white is positive, green is negative. They also changed the delay to 240 ms.
2002-11-05	0042	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0418.
2004-04-07	0042	LI-7500A	Calibration	Lab	Calibrated in the lab after being recently returned from Licor. There is a change in the power wiring. Red/white is positive, green is negative. They also changed the delay to 240 ms.
2003-04-06	0042	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0418 for calibration.
2004-04-07	0042	LI-7500A	Calibration	Lab	Calibrated in the lab after being recently returned from Licor. There is a change in the power wiring. Red/white is positive, green is negative. They also changed the delay to 240 ms.
2003-05-09	0042	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0073.
2004-04-07	0042	LI-7500A	Calibration	Lab	Calibrated in the lab after being recently returned from Licor. There is a change in the power wiring. Red/white is positive, green is negative. They also changed the delay to 240 ms.
2003-06-20	0042	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0065 for calibration.
2004-04-07	0042	LI-7500A	Calibration	Lab	Calibrated in the lab after being recently returned from Licor. There is a change in the power wiring. Red/white is positive, green is negative. They also changed the delay to 240 ms.
2011-09-29	0042	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on Vaira tower to replave sn 0073 for calibration.
2011-12-13	0042	LI-7500A	Calibration	Lab	Last calibration: 2011-09-27 AGC=73 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.67kPa, Tair=23.42C, Tdew=4.10C Zero Air at 800psi, CO2 in Air 436.53 at 1900 Tdewspan=10.08 CO2 zero 0.9592 -> 0.9597 Offset: 2.0ppm CO2 span 0.9758 -> 0.9840 Offset: 5.23ppm H2O zero 0.7852 -> 0.7828 Offset: -6.0ppm H2O span 0.9532 -> 0.9341 Offset: 0.32ppm Notes: The signal from this IRGA seems noisey and the AGC is pretty high.
2011-10-13	0042	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira Tower due to no signal and reporting 100% AGC even with clean lenses.
2011-12-13	0042	LI-7500A	Calibration	Lab	Last calibration: 2011-09-27 AGC=73 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.67kPa, Tair=23.42C, Tdew=4.10C Zero Air at 800psi, CO2 in Air 436.53 at 1900 Tdewspan=10.08 CO2 zero 0.9592 -> 0.9597 Offset: 2.0ppm CO2 span 0.9758 -> 0.9840 Offset: 5.23ppm H2O zero 0.7852 -> 0.7828 Offset: -6.0ppm H2O span 0.9532 -> 0.9341 Offset: 0.32ppm Notes: The signal from this IRGA seems noisey and the AGC is pretty high.
2012-05-18	0042	LI-7500A	Installed	Gas Analyzer CO2/H2O	Swapped onto the to tower to replace sn 0073 for calibration
2012-08-02	0042	LI-7500A	Calibration	Lab	Last calibration: 2012-05-17 AGC=53 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.49kPa, Tair=21.28C, Tdew=11.87C Zero Air at 1900psi, CO2 in air 436.53 at 1400 Tdewspan=15.08 CO2 zero 0.9546 -> 0.9513 Offset: -12.72ppm CO2 span 1.0182 -> 1.0044 Offset: 7.97ppm H2O zero 0.8346 -> 0.8472 Offset: 72.5ppm H2O span 0.8284 -> 0.9696 Offset: -3.2ppm Notes: Relatively large offsets seem to counter similar large offsets seen at last calibration. H2O zero offset may be a typo.
2012-07-25	0042	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira tower for calibration. Replaced by sn 0041.
2012-08-02	0042	LI-7500A	Calibration	Lab	Last calibration: 2012-05-17 AGC=53 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.49kPa, Tair=21.28C, Tdew=11.87C Zero Air at 1900psi, CO2 in air 436.53 at 1400 Tdewspan=15.08 CO2 zero 0.9546 -> 0.9513 Offset: -12.72ppm CO2 span 1.0182 -> 1.0044 Offset: 7.97ppm H2O zero 0.8346 -> 0.8472 Offset: 72.5ppm H2O span 0.8284 -> 0.9696 Offset: -3.2ppm Notes: Relatively large offsets seem to counter similar large offsets seen at last calibration. H2O zero offset may be a typo.
2013-04-24	0042	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira tower to swap out sn 0976 for calibration
2013-08-20	0042	LI-7500A	Calibration	Lab	Last calibration: 2013-04-23 AGC=54 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.28kPa, Tair=24.51C, Tdew=13.40C Zero Air at 1700psi, God CO2 421.22 at 1600 Tdewspan=15.19 CO2 zero 0.9504 -> 0.9503 Offset: -0.16ppm CO2 span 1.0033 -> 1.0 Offset: 1.23ppm H2O zero 0.8499 -> 0.8499 Offset: -0.06ppm H2O span 0.9779 -> 0.9929 Offset: -0.33ppm Notes:
2013-08-13	0042	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira tower for calibration. Replaced by sn0418
2013-08-20	0042	LI-7500A	Calibration	Lab	Last calibration: 2013-04-23 AGC=54 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.28kPa, Tair=24.51C, Tdew=13.40C Zero Air at 1700psi, God CO2 421.22 at 1600 Tdewspan=15.19 CO2 zero 0.9504 -> 0.9503 Offset: -0.16ppm CO2 span 1.0033 -> 1.0 Offset: 1.23ppm H2O zero 0.8499 -> 0.8499 Offset: -0.06ppm H2O span 0.9779 -> 0.9929 Offset: -0.33ppm Notes:
2016-08-23	0042	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira tower to replace sn 0073 for calibration.
2017-05-05	0042	LI-7500A	Calibration	Lab	Last calibration: 2016-08-15 AGC=99.9 SDM= DAC1= DAC2= Ambient P=100.2kPa, Tair=25.5C, Tdew=7.8C Zero Air at 1600psi, LBL Air 513.22 at 350 Tdewspan=16.00 CO2 zero 0.9504 -> .9847 Offset: -6.7ppm CO2 span 1.001 -> 1.0244 Offset: -15.52ppm H2O zero 0.8519 -> .8434 Offset: -54.8ppm H2O span 1.003 -> 1.1404 Offset: -2.72ppm Notes: First calibration since upgrade from LI-7500 to LI-7500A
2016-12-07	0042	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira Tower for calibration. Replaced by sn 0041.
2017-05-05	0042	LI-7500A	Calibration	Lab	Last calibration: 2016-08-15 AGC=99.9 SDM= DAC1= DAC2= Ambient P=100.2kPa, Tair=25.5C, Tdew=7.8C Zero Air at 1600psi, LBL Air 513.22 at 350 Tdewspan=16.00 CO2 zero 0.9504 -> .9847 Offset: -6.7ppm CO2 span 1.001 -> 1.0244 Offset: -15.52ppm H2O zero 0.8519 -> .8434 Offset: -54.8ppm H2O span 1.003 -> 1.1404 Offset: -2.72ppm Notes: First calibration since upgrade from LI-7500 to LI-7500A
2021-09-01	0042	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0065 for calibration.
2021-12-09	0042	LI-7500A	Calibration	Lab	Last calibration: 2021-08-31 AGC=100.7 SDM= DAC1= DAC2= Ambient P=100.4kPa, Tair=25.9C, Tdew=5.9C Zero Air at 100psi, AMP CA04119 524.77 at 1700 Tdewspan=20.00 CO2 zero 0.9479 -> .9481 Offset: .73ppm CO2 span 1.0063 -> 1.0091 Offset: -1.82ppm H2O zero 0.8448 -> .8452 Offset: 2.4ppm H2O span 1.0163 -> 1.0123 Offset: -.11ppm Notes: <100psi of air left in the zero air tank, but the zero was stable for 2+ min after setting the zeros, so I feel comfortable the calibration was good.
2021-12-02	0042	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 75H-2182.
2021-12-09	0042	LI-7500A	Calibration	Lab	Last calibration: 2021-08-31 AGC=100.7 SDM= DAC1= DAC2= Ambient P=100.4kPa, Tair=25.9C, Tdew=5.9C Zero Air at 100psi, AMP CA04119 524.77 at 1700 Tdewspan=20.00 CO2 zero 0.9479 -> .9481 Offset: .73ppm CO2 span 1.0063 -> 1.0091 Offset: -1.82ppm H2O zero 0.8448 -> .8452 Offset: 2.4ppm H2O span 1.0163 -> 1.0123 Offset: -.11ppm Notes: <100psi of air left in the zero air tank, but the zero was stable for 2+ min after setting the zeros, so I feel comfortable the calibration was good.
2024-03-26	0042	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0035 for calibration.
2024-07-12	0042	LI-7500A	Calibration	Lab	Last calibration: 2024-03-23 AGC=101.5 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=99.9kPa, Tair=23.17C, Tdew=13.9C Zero Air at 1750psi, AMP CA04119 524.77 at 350 Tdewspan=20.00 CO2 zero 0.9483 -> .9482 Offset: -.53ppm CO2 span 1.0098 -> 1.0114 Offset: -1.07ppm H2O zero 0.8451 -> .8455 Offset: 2.1ppm H2O span 1.02 -> 1.0264 Offset: -.14ppm Notes:
2024-06-19	0042	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 75H-2182.
2024-07-12	0042	LI-7500A	Calibration	Lab	Last calibration: 2024-03-23 AGC=101.5 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=99.9kPa, Tair=23.17C, Tdew=13.9C Zero Air at 1750psi, AMP CA04119 524.77 at 350 Tdewspan=20.00 CO2 zero 0.9483 -> .9482 Offset: -.53ppm CO2 span 1.0098 -> 1.0114 Offset: -1.07ppm H2O zero 0.8451 -> .8455 Offset: 2.1ppm H2O span 1.02 -> 1.0264 Offset: -.14ppm Notes:
2001-03-22	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0041.
2009-12-03	0065	LI-7500A	Calibration	Lab	AGC = 62, Pressure = 99.73kPa, Temperature = 21.63C span CO2 = 594.7ppm, span H2O = 16.7C from dewpoint generator Last calibration Aug 26, 2009 Last CO2 zero = 0.8738, span = 0.9939 Last H2O zero = 0.6414, span = 1.0055 New CO2 zero = 0.8739, span = 0.9931 New H2O zero = 0.6378, span = 0.9992 Configuration downloaded and saved
2002-02-28	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0035.
2009-12-03	0065	LI-7500A	Calibration	Lab	AGC = 62, Pressure = 99.73kPa, Temperature = 21.63C span CO2 = 594.7ppm, span H2O = 16.7C from dewpoint generator Last calibration Aug 26, 2009 Last CO2 zero = 0.8738, span = 0.9939 Last H2O zero = 0.6414, span = 1.0055 New CO2 zero = 0.8739, span = 0.9931 New H2O zero = 0.6378, span = 0.9992 Configuration downloaded and saved
2002-05-09	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0042 for calibration.
2009-12-03	0065	LI-7500A	Calibration	Lab	AGC = 62, Pressure = 99.73kPa, Temperature = 21.63C span CO2 = 594.7ppm, span H2O = 16.7C from dewpoint generator Last calibration Aug 26, 2009 Last CO2 zero = 0.8738, span = 0.9939 Last H2O zero = 0.6414, span = 1.0055 New CO2 zero = 0.8739, span = 0.9931 New H2O zero = 0.6378, span = 0.9992 Configuration downloaded and saved
2002-06-20	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0073.
2009-12-03	0065	LI-7500A	Calibration	Lab	AGC = 62, Pressure = 99.73kPa, Temperature = 21.63C span CO2 = 594.7ppm, span H2O = 16.7C from dewpoint generator Last calibration Aug 26, 2009 Last CO2 zero = 0.8738, span = 0.9939 Last H2O zero = 0.6414, span = 1.0055 New CO2 zero = 0.8739, span = 0.9931 New H2O zero = 0.6378, span = 0.9992 Configuration downloaded and saved
2002-12-23	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0418 for calibration.
2009-12-03	0065	LI-7500A	Calibration	Lab	AGC = 62, Pressure = 99.73kPa, Temperature = 21.63C span CO2 = 594.7ppm, span H2O = 16.7C from dewpoint generator Last calibration Aug 26, 2009 Last CO2 zero = 0.8738, span = 0.9939 Last H2O zero = 0.6414, span = 1.0055 New CO2 zero = 0.8739, span = 0.9931 New H2O zero = 0.6378, span = 0.9992 Configuration downloaded and saved
2003-05-30	0065	LI-7500A	Moved	Gas Analyzer CO2/H2O	Moved from Tonzi-Floor to Vaira because the Floor sonic was dead and the Vaira 7500 box had a bad power connector
2009-12-03	0065	LI-7500A	Calibration	Lab	AGC = 62, Pressure = 99.73kPa, Temperature = 21.63C span CO2 = 594.7ppm, span H2O = 16.7C from dewpoint generator Last calibration Aug 26, 2009 Last CO2 zero = 0.8738, span = 0.9939 Last H2O zero = 0.6414, span = 1.0055 New CO2 zero = 0.8739, span = 0.9931 New H2O zero = 0.6378, span = 0.9992 Configuration downloaded and saved
2003-06-20	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0042.
2009-12-03	0065	LI-7500A	Calibration	Lab	AGC = 62, Pressure = 99.73kPa, Temperature = 21.63C span CO2 = 594.7ppm, span H2O = 16.7C from dewpoint generator Last calibration Aug 26, 2009 Last CO2 zero = 0.8738, span = 0.9939 Last H2O zero = 0.6414, span = 1.0055 New CO2 zero = 0.8739, span = 0.9931 New H2O zero = 0.6378, span = 0.9992 Configuration downloaded and saved
2004-04-07	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0041
2009-12-03	0065	LI-7500A	Calibration	Lab	AGC = 62, Pressure = 99.73kPa, Temperature = 21.63C span CO2 = 594.7ppm, span H2O = 16.7C from dewpoint generator Last calibration Aug 26, 2009 Last CO2 zero = 0.8738, span = 0.9939 Last H2O zero = 0.6414, span = 1.0055 New CO2 zero = 0.8739, span = 0.9931 New H2O zero = 0.6378, span = 0.9992 Configuration downloaded and saved
2005-01-27	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira replacing current IRGA presumably for calibration
2009-12-03	0065	LI-7500A	Calibration	Lab	AGC = 62, Pressure = 99.73kPa, Temperature = 21.63C span CO2 = 594.7ppm, span H2O = 16.7C from dewpoint generator Last calibration Aug 26, 2009 Last CO2 zero = 0.8738, span = 0.9939 Last H2O zero = 0.6414, span = 1.0055 New CO2 zero = 0.8739, span = 0.9931 New H2O zero = 0.6378, span = 0.9992 Configuration downloaded and saved
2011-01-19	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	This sensor was installed on the Vaira tower after laboratory calibration. sn 1597 was removed.
2011-05-24	0065	LI-7500A	Calibration	Lab	Last calibration: 2011-04-21 AGC=62 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=99.67kPa, Tair=23.61C, Tdew=9.06C zero air at 1450psi, CO2 in air 597.4 at 0 Tdewspan=14.2 CO2 zero 0.8741 -> 0.8748 Offset: 2.56ppm CO2 span 1.0093 -> 0.9939 Offset: 13.41ppm H2O zero 0.7366 -> 0.6408 Offset: -7.5ppm H2O span 0.9749 -> 1.014 Offset: -0.58ppm Notes:
2011-03-30	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Swapped off the Vaira tower for calibration. Replaced by sn 0418.
2011-05-24	0065	LI-7500A	Calibration	Lab	Last calibration: 2011-04-21 AGC=62 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=99.67kPa, Tair=23.61C, Tdew=9.06C zero air at 1450psi, CO2 in air 597.4 at 0 Tdewspan=14.2 CO2 zero 0.8741 -> 0.8748 Offset: 2.56ppm CO2 span 1.0093 -> 0.9939 Offset: 13.41ppm H2O zero 0.7366 -> 0.6408 Offset: -7.5ppm H2O span 0.9749 -> 1.014 Offset: -0.58ppm Notes:
2017-11-29	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira tower to replace sn 75H-2514 for calibration.
2018-04-04	0065	LI-7500A	Calibration	Lab	Last calibration: 2017-11-28 AGC=100.4 SDM=0 DAC1=0 DAC2=0 Ambient P=100.8kPa, Tair=22.5C, Tdew=9.3C Zero Air at 100psi, LBL Air 408.97 at 1700 Tdewspan=16.00 CO2 zero 0.8906 -> .8905 Offset: -.52ppm CO2 span 1.0163 -> 1.0231 Offset: -3.35ppm H2O zero 0.7083 -> .7082 Offset: -.7ppm H2O span 1.0126 -> 1.0185 Offset: -.13ppm Notes: Calibrated on LI-7550 sn 674 with 8.5.0 embedded software version
2018-03-06	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed for calibration and replaced by sn 75H-2182.
2018-04-04	0065	LI-7500A	Calibration	Lab	Last calibration: 2017-11-28 AGC=100.4 SDM=0 DAC1=0 DAC2=0 Ambient P=100.8kPa, Tair=22.5C, Tdew=9.3C Zero Air at 100psi, LBL Air 408.97 at 1700 Tdewspan=16.00 CO2 zero 0.8906 -> .8905 Offset: -.52ppm CO2 span 1.0163 -> 1.0231 Offset: -3.35ppm H2O zero 0.7083 -> .7082 Offset: -.7ppm H2O span 1.0126 -> 1.0185 Offset: -.13ppm Notes: Calibrated on LI-7550 sn 674 with 8.5.0 embedded software version
2018-09-27	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira Tower to replace sn 1594 for calibration.
2019-02-11	0065	LI-7500A	Calibration	Lab	Last calibration: 2018-09-26 AGC= SDM= DAC1= DAC2= Ambient P=kPa, Tair=C, Tdew=C at psi, at Tdewspan=12.00 CO2 zero 0.8903 -> .8920 Offset: ppm CO2 span 1.0184 -> 1.0073 Offset: ppm H2O zero 0.7086 -> 07263 Offset: ppm H2O span 1.0155 -> 1.0104 Offset: ppm Notes: CX=34338.1, WX=34091.7. Calibrated at Licor factory after source/chopper replacement.
2018-10-17	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira due to no CO2, H2O or Signal Strength - maybe bad source or detector. Replaced by sn 0418
2019-02-11	0065	LI-7500A	Calibration	Lab	Last calibration: 2018-09-26 AGC= SDM= DAC1= DAC2= Ambient P=kPa, Tair=C, Tdew=C at psi, at Tdewspan=12.00 CO2 zero 0.8903 -> .8920 Offset: ppm CO2 span 1.0184 -> 1.0073 Offset: ppm H2O zero 0.7086 -> 07263 Offset: ppm H2O span 1.0155 -> 1.0104 Offset: ppm Notes: CX=34338.1, WX=34091.7. Calibrated at Licor factory after source/chopper replacement.
2021-06-02	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 75H-2667 for calibration.
2021-09-08	0065	LI-7500A	Calibration	Lab	Last calibration: 2021-06-01 AGC=102 SDM= DAC1= DAC2= Ambient P=100.3kPa, Tair=27.75C, Tdew=15.5C Zero Air at 1875psi, AMP CA04119 524.77 at 1700 Tdewspan=20.00 CO2 zero 0.8913 -> .8911 Offset: -1.15ppm CO2 span 1.0201 -> 1.0211 Offset: .7ppm H2O zero 0.7305 -> .7313 Offset: 5.7ppm H2O span 1.0158 -> 1.0143 Offset: .03ppm Notes: Showing Carlos how to calibrate 7500s
2021-09-01	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0042.
2021-09-08	0065	LI-7500A	Calibration	Lab	Last calibration: 2021-06-01 AGC=102 SDM= DAC1= DAC2= Ambient P=100.3kPa, Tair=27.75C, Tdew=15.5C Zero Air at 1875psi, AMP CA04119 524.77 at 1700 Tdewspan=20.00 CO2 zero 0.8913 -> .8911 Offset: -1.15ppm CO2 span 1.0201 -> 1.0211 Offset: .7ppm H2O zero 0.7305 -> .7313 Offset: 5.7ppm H2O span 1.0158 -> 1.0143 Offset: .03ppm Notes: Showing Carlos how to calibrate 7500s
2022-09-14	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 75H-2667 for calibration.
2023-01-04	0065	LI-7500A	Calibration	Lab	Last calibration: 2022-09-12 AGC=101.1 SDM=0 DAC1=- DAC2=- Ambient P=99.5kPa, Tair=18.1C, Tdew=10.7C Zero Air at 1650psi, AMP CA04119 524.77 at 1250 Tdewspan=15.0 CO2 zero 0.8918 -> 0.8915 Offset: -1.5ppm CO2 span 1.0227 -> 1.0227 Offset: 0.03ppm H2O zero 0.7316 -> 0.7323 Offset: 5.1ppm H2O span 1.0167 -> 1.0226 Offset: -0.12ppm Notes:
2022-12-06	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 75H-2176.
2023-01-04	0065	LI-7500A	Calibration	Lab	Last calibration: 2022-09-12 AGC=101.1 SDM=0 DAC1=- DAC2=- Ambient P=99.5kPa, Tair=18.1C, Tdew=10.7C Zero Air at 1650psi, AMP CA04119 524.77 at 1250 Tdewspan=15.0 CO2 zero 0.8918 -> 0.8915 Offset: -1.5ppm CO2 span 1.0227 -> 1.0227 Offset: 0.03ppm H2O zero 0.7316 -> 0.7323 Offset: 5.1ppm H2O span 1.0167 -> 1.0226 Offset: -0.12ppm Notes:
2023-09-19	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 1594 for calibration.
2024-01-03	0065	LI-7500A	Calibration	Lab	Last calibration: 2023-09-18 AGC=100 SDM=0 DAC1=- DAC2=- AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.8kPa, Tair=22.7C, Tdew=7.3C Zero Air at 550psi, AMP CA04119 524.77 at 700 Tdewspan=20.0 CO2 zero 0.8919 -> 0.8918 Offset: -0.27ppm CO2 span 1.024 -> 1.0255 Offset: -1.3ppm H2O zero 0.7322 -> 0.7329 Offset: 4.9ppm H2O span 1.0226 -> 1.0238 Offset: -0.02ppm Notes: Signal strength rest from 107 to 100 before calibration. Used CO2 span pt of 524.67
2024-01-02	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0035.
2024-01-03	0065	LI-7500A	Calibration	Lab	Last calibration: 2023-09-18 AGC=100 SDM=0 DAC1=- DAC2=- AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.8kPa, Tair=22.7C, Tdew=7.3C Zero Air at 550psi, AMP CA04119 524.77 at 700 Tdewspan=20.0 CO2 zero 0.8919 -> 0.8918 Offset: -0.27ppm CO2 span 1.024 -> 1.0255 Offset: -1.3ppm H2O zero 0.7322 -> 0.7329 Offset: 4.9ppm H2O span 1.0226 -> 1.0238 Offset: -0.02ppm Notes: Signal strength rest from 107 to 100 before calibration. Used CO2 span pt of 524.67
2002-06-20	0073	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0065 for calibration.
2010-03-18	0073	LI-7500A	Calibration	Lab	Calibrated in the lab 100.46kPa, 17.08C, 58% AGC 12.8C Td N2 tank 0.0 @ 700psi, CO2 tank 597.4ppm @ 200psi Last cal 11-4-2009 CO2 zero 0.9587 -> 0.9576 offset -6.4ppm CO2 span 0.9973 -> 0.9960 offset +0.6ppm H2O zero 0.7325 -> 0.7346 offset +0.238g/m3 H2O span 0.9865 -> 1.0007 offset -0.2C SDM address 7
2002-07-19	0073	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0042.
2010-03-18	0073	LI-7500A	Calibration	Lab	Calibrated in the lab 100.46kPa, 17.08C, 58% AGC 12.8C Td N2 tank 0.0 @ 700psi, CO2 tank 597.4ppm @ 200psi Last cal 11-4-2009 CO2 zero 0.9587 -> 0.9576 offset -6.4ppm CO2 span 0.9973 -> 0.9960 offset +0.6ppm H2O zero 0.7325 -> 0.7346 offset +0.238g/m3 H2O span 0.9865 -> 1.0007 offset -0.2C SDM address 7
2003-05-09	0073	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0042 for calibration.
2010-03-18	0073	LI-7500A	Calibration	Lab	Calibrated in the lab 100.46kPa, 17.08C, 58% AGC 12.8C Td N2 tank 0.0 @ 700psi, CO2 tank 597.4ppm @ 200psi Last cal 11-4-2009 CO2 zero 0.9587 -> 0.9576 offset -6.4ppm CO2 span 0.9973 -> 0.9960 offset +0.6ppm H2O zero 0.7325 -> 0.7346 offset +0.238g/m3 H2O span 0.9865 -> 1.0007 offset -0.2C SDM address 7
2003-05-30	0073	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira due to bad power connector on the box.
2010-03-18	0073	LI-7500A	Calibration	Lab	Calibrated in the lab 100.46kPa, 17.08C, 58% AGC 12.8C Td N2 tank 0.0 @ 700psi, CO2 tank 597.4ppm @ 200psi Last cal 11-4-2009 CO2 zero 0.9587 -> 0.9576 offset -6.4ppm CO2 span 0.9973 -> 0.9960 offset +0.6ppm H2O zero 0.7325 -> 0.7346 offset +0.238g/m3 H2O span 0.9865 -> 1.0007 offset -0.2C SDM address 7
2003-10-02	0073	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0035.
2010-03-18	0073	LI-7500A	Calibration	Lab	Calibrated in the lab 100.46kPa, 17.08C, 58% AGC 12.8C Td N2 tank 0.0 @ 700psi, CO2 tank 597.4ppm @ 200psi Last cal 11-4-2009 CO2 zero 0.9587 -> 0.9576 offset -6.4ppm CO2 span 0.9973 -> 0.9960 offset +0.6ppm H2O zero 0.7325 -> 0.7346 offset +0.238g/m3 H2O span 0.9865 -> 1.0007 offset -0.2C SDM address 7
2009-01-08	0073	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira Tower for calibration. Replaced by sn 0041.
2010-03-18	0073	LI-7500A	Calibration	Lab	Calibrated in the lab 100.46kPa, 17.08C, 58% AGC 12.8C Td N2 tank 0.0 @ 700psi, CO2 tank 597.4ppm @ 200psi Last cal 11-4-2009 CO2 zero 0.9587 -> 0.9576 offset -6.4ppm CO2 span 0.9973 -> 0.9960 offset +0.6ppm H2O zero 0.7325 -> 0.7346 offset +0.238g/m3 H2O span 0.9865 -> 1.0007 offset -0.2C SDM address 7
2011-07-06	0073	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira tower after laboratory calibration. Replaced sn 0418.
2011-10-17	0073	LI-7500A	Calibration	Lab	Last calibration: 2011-10-17 AGC=56 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100kPa, Tair=21.8C, Tdew=5.6C dry air at 600psi, CO2 436.53 at 1900 Tdewspan=13.6 CO2 zero 0.9584 -> 0.9578 Offset: -2.00ppm CO2 span 1.0022 -> 1.0000 Offset: 1.09ppm H2O zero 0.7390 -> 0.7381 Offset: -0.12ppm H2O span 0.9873 -> 0.9940 Offset: 0.09ppm Notes: operated by Siyan Ma
2011-09-29	0073	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration - replaced by sn 0042
2011-10-17	0073	LI-7500A	Calibration	Lab	Last calibration: 2011-10-17 AGC=56 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100kPa, Tair=21.8C, Tdew=5.6C dry air at 600psi, CO2 436.53 at 1900 Tdewspan=13.6 CO2 zero 0.9584 -> 0.9578 Offset: -2.00ppm CO2 span 1.0022 -> 1.0000 Offset: 1.09ppm H2O zero 0.7390 -> 0.7381 Offset: -0.12ppm H2O span 0.9873 -> 0.9940 Offset: 0.09ppm Notes: operated by Siyan Ma
2012-01-04	0073	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira tower to swap out sn 1594 for calibration.
2012-07-24	0073	LI-7500A	Calibration	Lab	Last calibration: 2012-01-03 AGC=60 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.3kPa, Tair=25.6C, Tdew=11.5C dry air at 1900psi, CO2 436.53 at 1500 Tdewspan=15.0 CO2 zero 0.9578 -> 0.9581 Offset: 1.01ppm CO2 span 1 -> 1.0042 Offset: 1.35ppm H2O zero 0.7381 -> 0.7305 Offset: -1.12ppm H2O span 0.994 -> 1.0154 Offset: 0.4ppm Notes: calibrated by Siyan
2012-05-18	0073	LI-7500A	Removed	Gas Analyzer CO2/H2O	Swapped off the tower for calibration, replaced by sn 0042
2012-07-24	0073	LI-7500A	Calibration	Lab	Last calibration: 2012-01-03 AGC=60 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.3kPa, Tair=25.6C, Tdew=11.5C dry air at 1900psi, CO2 436.53 at 1500 Tdewspan=15.0 CO2 zero 0.9578 -> 0.9581 Offset: 1.01ppm CO2 span 1 -> 1.0042 Offset: 1.35ppm H2O zero 0.7381 -> 0.7305 Offset: -1.12ppm H2O span 0.994 -> 1.0154 Offset: 0.4ppm Notes: calibrated by Siyan
2014-06-25	0073	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira tower to replace sn 0035 for calibration.
2014-09-23	0073	LI-7500A	Calibration	Lab	Last calibration: 2014-06-24 AGC=59 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.46kPa, Tair=25.61C, Tdew=17.80C Zero Air at 1050psi, God CO2 421.22 at 1350 Tdewspan=15.80 CO2 zero 0.958 -> 0.9586 Offset: 2.05ppm CO2 span 1.0018 -> 1.0023 Offset: -0.37ppm H2O zero 0.7389 -> 0.7382 Offset: -3.9ppm H2O span 1.0138 -> 1.0109 Offset: 0.06ppm Notes:
2014-09-11	0073	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira tower for calibration. Replaced by sn 0035.
2014-09-23	0073	LI-7500A	Calibration	Lab	Last calibration: 2014-06-24 AGC=59 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.46kPa, Tair=25.61C, Tdew=17.80C Zero Air at 1050psi, God CO2 421.22 at 1350 Tdewspan=15.80 CO2 zero 0.958 -> 0.9586 Offset: 2.05ppm CO2 span 1.0018 -> 1.0023 Offset: -0.37ppm H2O zero 0.7389 -> 0.7382 Offset: -3.9ppm H2O span 1.0138 -> 1.0109 Offset: 0.06ppm Notes:
2016-05-10	0073	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira tower to replace sn 0976 for calibration.
2016-12-05	0073	LI-7500A	Calibration	Lab	Last calibration: 2016-05-05 AGC=59 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.65kPa, Tair=20.82C, Tdew=8.53C Zero Air at 400psi, God CO2 421.22 at 450 Tdewspan=16.00 CO2 zero 0.9579 -> 0.9576 Offset: ppm CO2 span 1.0029 -> 1.0707 Offset: -0.30ppm H2O zero 0.7385 -> 0.7391 Offset: 0.09ppm H2O span 1.0159 -> 1.0255 Offset: -0.02ppm Notes:
2016-08-23	0073	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira tower for calibration, replaced by sn 0042
2016-12-05	0073	LI-7500A	Calibration	Lab	Last calibration: 2016-05-05 AGC=59 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.65kPa, Tair=20.82C, Tdew=8.53C Zero Air at 400psi, God CO2 421.22 at 450 Tdewspan=16.00 CO2 zero 0.9579 -> 0.9576 Offset: ppm CO2 span 1.0029 -> 1.0707 Offset: -0.30ppm H2O zero 0.7385 -> 0.7391 Offset: 0.09ppm H2O span 1.0159 -> 1.0255 Offset: -0.02ppm Notes:
2017-04-10	0073	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira tower to replace sn 0041 for calibration.
2017-06-13	0073	LI-7500A	Calibration	Lab	Last calibration: 2017-04-07 AGC=100.3 SDM= DAC1= DAC2= Ambient P=100.2kPa, Tair=21.9C, Tdew=11.2C Zero Air at 1500psi, NOAA Air 402.69 at 1600 Tdewspan=16.00 CO2 zero 0.9578 -> .9567 Offset: -3.62ppm CO2 span 1.0036 -> 1.0065 Offset: -1.63ppm H2O zero 0.7388 -> .7342 Offset: -26.9ppm H2O span 1.0096 -> 1.0251 Offset: -0.36ppm Notes: First calibration since upgrade from 7500 to 7500A. Copied coefficients for CO2 (A, B, C, D, E, XS, Z) and H2O (A, B, C, XS, Z) from sn0073_20170118post.l75 before calibration. Took about 9-10 minutes for H2O to go down to 0, took about 1-2 minutes for CO2 to reach span, and took ~9 minutes for H2O to reach span. Set span T to 15.99 in software for a 16.00 Span Dew Point.
2017-05-24	0073	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira Tower. Replaced by the new Licor GHG system from Ameriflux.
2017-06-13	0073	LI-7500A	Calibration	Lab	Last calibration: 2017-04-07 AGC=100.3 SDM= DAC1= DAC2= Ambient P=100.2kPa, Tair=21.9C, Tdew=11.2C Zero Air at 1500psi, NOAA Air 402.69 at 1600 Tdewspan=16.00 CO2 zero 0.9578 -> .9567 Offset: -3.62ppm CO2 span 1.0036 -> 1.0065 Offset: -1.63ppm H2O zero 0.7388 -> .7342 Offset: -26.9ppm H2O span 1.0096 -> 1.0251 Offset: -0.36ppm Notes: First calibration since upgrade from 7500 to 7500A. Copied coefficients for CO2 (A, B, C, D, E, XS, Z) and H2O (A, B, C, XS, Z) from sn0073_20170118post.l75 before calibration. Took about 9-10 minutes for H2O to go down to 0, took about 1-2 minutes for CO2 to reach span, and took ~9 minutes for H2O to reach span. Set span T to 15.99 in software for a 16.00 Span Dew Point.
2020-02-12	0073	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0035 for calibration.
2020-08-20	0073	LI-7500A	Calibration	Lab	Last calibration: 2020-02-11 AGC=100.8 SDM= DAC1= DAC2= Ambient P=100.0kPa, Tair=28.7C, Tdew=13.9C Zero Air at 700psi, AMP CA4396 408.97 at 500 Tdewspan=20.00 CO2 zero 0.9572 -> 0.9575 Offset: 0.96ppm CO2 span 1.0096 -> 1.0092 Offset: -0.11ppm H2O zero 0.7313 -> .7312 Offset: -0.3ppm H2O span 1.0091 -> 1.0118 Offset: -0.07ppm Notes: Air quality bad inside from wildfire smoke leaking in through windows
2020-05-23	0073	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 75H-2669.
2020-08-20	0073	LI-7500A	Calibration	Lab	Last calibration: 2020-02-11 AGC=100.8 SDM= DAC1= DAC2= Ambient P=100.0kPa, Tair=28.7C, Tdew=13.9C Zero Air at 700psi, AMP CA4396 408.97 at 500 Tdewspan=20.00 CO2 zero 0.9572 -> 0.9575 Offset: 0.96ppm CO2 span 1.0096 -> 1.0092 Offset: -0.11ppm H2O zero 0.7313 -> .7312 Offset: -0.3ppm H2O span 1.0091 -> 1.0118 Offset: -0.07ppm Notes: Air quality bad inside from wildfire smoke leaking in through windows
2002-08-15	0418	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0042 for calibration.
2010-03-18	0418	LI-7500A	Calibration	Lab	Calibrated in the lab 100.70kPa, 18.36C, 49% AGC 13.9C Td N2 tank 0.0 @ 700psi, CO2 tank 597.4ppm @ 200psi Last cal 11-4-2009 CO2 zero 0.9020 -> 0.9011 offset -3.18ppm CO2 span 1.0000 -> 1.0042 offset +3.5ppm H2O zero 0.8486 -> 0.8524 offset +0.410g/m3 H2O span 0.9807 -> 1.0097 offset 0.45C SDM address 3
2002-09-20	0418	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0042.
2010-03-18	0418	LI-7500A	Calibration	Lab	Calibrated in the lab 100.70kPa, 18.36C, 49% AGC 13.9C Td N2 tank 0.0 @ 700psi, CO2 tank 597.4ppm @ 200psi Last cal 11-4-2009 CO2 zero 0.9020 -> 0.9011 offset -3.18ppm CO2 span 1.0000 -> 1.0042 offset +3.5ppm H2O zero 0.8486 -> 0.8524 offset +0.410g/m3 H2O span 0.9807 -> 1.0097 offset 0.45C SDM address 3
2002-11-05	0418	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0042 for calibration.
2010-03-18	0418	LI-7500A	Calibration	Lab	Calibrated in the lab 100.70kPa, 18.36C, 49% AGC 13.9C Td N2 tank 0.0 @ 700psi, CO2 tank 597.4ppm @ 200psi Last cal 11-4-2009 CO2 zero 0.9020 -> 0.9011 offset -3.18ppm CO2 span 1.0000 -> 1.0042 offset +3.5ppm H2O zero 0.8486 -> 0.8524 offset +0.410g/m3 H2O span 0.9807 -> 1.0097 offset 0.45C SDM address 3
2002-12-23	0418	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0065.
2010-03-18	0418	LI-7500A	Calibration	Lab	Calibrated in the lab 100.70kPa, 18.36C, 49% AGC 13.9C Td N2 tank 0.0 @ 700psi, CO2 tank 597.4ppm @ 200psi Last cal 11-4-2009 CO2 zero 0.9020 -> 0.9011 offset -3.18ppm CO2 span 1.0000 -> 1.0042 offset +3.5ppm H2O zero 0.8486 -> 0.8524 offset +0.410g/m3 H2O span 0.9807 -> 1.0097 offset 0.45C SDM address 3
2003-04-06	0418	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0042.
2010-03-18	0418	LI-7500A	Calibration	Lab	Calibrated in the lab 100.70kPa, 18.36C, 49% AGC 13.9C Td N2 tank 0.0 @ 700psi, CO2 tank 597.4ppm @ 200psi Last cal 11-4-2009 CO2 zero 0.9020 -> 0.9011 offset -3.18ppm CO2 span 1.0000 -> 1.0042 offset +3.5ppm H2O zero 0.8486 -> 0.8524 offset +0.410g/m3 H2O span 0.9807 -> 1.0097 offset 0.45C SDM address 3
2010-08-14	0418	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on Vaira tower by Siyan after lab calibration.
2010-11-16	0418	LI-7500A	Calibration	Lab	Last cal 2010-08-13, SMD 7 DAC1 H2O 0-1000 DAC2 CO2 10-25 AGC = 49%, T = 24.35C, P = 100.92kPa, Td = 12C Zero Air 1700psi, CO2 597.4ppm 200psi, Td = 9.6C CO2 zero = 0.9038-> 0.9017, offset -8.3ppm CO2 span = 1.0047-> 0.9983, offset +5.6ppm H2O zero = 0.8467-> 0.8479, offset +7.2mmol/m3 H2O span = 0.9841-> 0.9644, offset +0.43C
2010-10-07	0418	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira Tower for calibration. sn 1594 swapped in.
2010-11-16	0418	LI-7500A	Calibration	Lab	Last cal 2010-08-13, SMD 7 DAC1 H2O 0-1000 DAC2 CO2 10-25 AGC = 49%, T = 24.35C, P = 100.92kPa, Td = 12C Zero Air 1700psi, CO2 597.4ppm 200psi, Td = 9.6C CO2 zero = 0.9038-> 0.9017, offset -8.3ppm CO2 span = 1.0047-> 0.9983, offset +5.6ppm H2O zero = 0.8467-> 0.8479, offset +7.2mmol/m3 H2O span = 0.9841-> 0.9644, offset +0.43C
2011-03-30	0418	LI-7500A	Installed	Gas Analyzer CO2/H2O	Swapped on to the Vaira tower to replace sn 0065 for calibration.
2011-10-17	0418	LI-7500A	Calibration	Lab	Last calibration: 2011-07-05 AGC=61 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.48kPa, Tair=30.7C, Tdew=16.56C dry air at 700psi, CO2 2000 at 2000 Tdewspan=18.3 CO2 zero 0.9588 -> 0.9584 Offset: -1.13ppm CO2 span 1 -> 1.0022 Offset: 1.08ppm H2O zero 0.74 -> 0.7390 Offset: -0.07ppm H2O span 1.0033 -> 0.9873 Offset: 0.4ppm Notes: calibrated by Siyan
2011-07-06	0418	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira tower for calibration. Replaced by sn 0073.
2011-10-17	0418	LI-7500A	Calibration	Lab	Last calibration: 2011-07-05 AGC=61 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.48kPa, Tair=30.7C, Tdew=16.56C dry air at 700psi, CO2 2000 at 2000 Tdewspan=18.3 CO2 zero 0.9588 -> 0.9584 Offset: -1.13ppm CO2 span 1 -> 1.0022 Offset: 1.08ppm H2O zero 0.74 -> 0.7390 Offset: -0.07ppm H2O span 1.0033 -> 0.9873 Offset: 0.4ppm Notes: calibrated by Siyan
2012-10-24	0418	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira Tower to swap out 0041 for calibration.
2013-04-18	0418	LI-7500A	Calibration	Lab	Last calibration: 2012-10-23 AGC=43 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=101.71kPa, Tair=22.02C, Tdew=4.42C Zero air at 1700psi, CO2 in air 392.30 at 1700 Tdewspan=15.04 CO2 zero 0.9011 -> 0.9017 Offset: 2.26ppm CO2 span 1.0085 -> 1.0104 Offset: -0.9ppm H2O zero 0.8516 -> 0.8497 Offset: -10.7ppm H2O span 1 -> 0.9871 Offset: ppm Notes:
2013-02-27	0418	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira Tower by Siyan for calibration. Replaced by sn 0976.
2013-04-18	0418	LI-7500A	Calibration	Lab	Last calibration: 2012-10-23 AGC=43 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=101.71kPa, Tair=22.02C, Tdew=4.42C Zero air at 1700psi, CO2 in air 392.30 at 1700 Tdewspan=15.04 CO2 zero 0.9011 -> 0.9017 Offset: 2.26ppm CO2 span 1.0085 -> 1.0104 Offset: -0.9ppm H2O zero 0.8516 -> 0.8497 Offset: -10.7ppm H2O span 1 -> 0.9871 Offset: ppm Notes:
2013-08-13	0418	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira tower to replace sn0042 for calibration
2013-12-05	0418	LI-7500A	Calibration	Lab	Last calibration: 2013-08-12 AGC=49 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=101.09kPa, Tair=22.90C, Tdew=-7.14C Zero air at 1500psi, God CO2 421.22 at 1500 Tdewspan=15.17 CO2 zero 0.9014 -> 0.9014 Offset: -0.3ppm CO2 span 1.0027 -> 1.0016 Offset: 0.48ppm H2O zero 0.8522 -> 0.8521 Offset: -0.3ppm H2O span 0.9825 -> 0.9806 Offset: 0.02ppm Notes: The serial connector on the bottom of the box had a broken pin. I replaced it with one from the old sn 0065 box.
2013-11-27	0418	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira Tower for calibration. Replaced by sn 0041
2013-12-05	0418	LI-7500A	Calibration	Lab	Last calibration: 2013-08-12 AGC=49 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=101.09kPa, Tair=22.90C, Tdew=-7.14C Zero air at 1500psi, God CO2 421.22 at 1500 Tdewspan=15.17 CO2 zero 0.9014 -> 0.9014 Offset: -0.3ppm CO2 span 1.0027 -> 1.0016 Offset: 0.48ppm H2O zero 0.8522 -> 0.8521 Offset: -0.3ppm H2O span 0.9825 -> 0.9806 Offset: 0.02ppm Notes: The serial connector on the bottom of the box had a broken pin. I replaced it with one from the old sn 0065 box.
2018-10-17	0418	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on Vaira to replace sn 0065 that had no CO2, H2O or signal strength.
2019-01-07	0418	LI-7500A	Calibration	Lab	Last calibration: 2018-10-10 AGC=97.2 SDM=0 DAC1=0 DAC2=0 Ambient P=100.9kPa, Tair=17.9C, Tdew=9.7C Zero Air at 1200psi, AMP Air 408.97 at 900 Tdewspan=16.00 CO2 zero 0.8982 -> .8992 Offset: 3.69ppm CO2 span 0.9965 -> 1.0033 Offset: -3.58ppm H2O zero 0.8454 -> .8465 Offset: 6.1ppm H2O span 0.9813 -> .9832 Offset: -.03ppm Notes:
2019-01-04	0418	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira tower for calibration. Replaced by sn 75H-2176.
2019-01-07	0418	LI-7500A	Calibration	Lab	Last calibration: 2018-10-10 AGC=97.2 SDM=0 DAC1=0 DAC2=0 Ambient P=100.9kPa, Tair=17.9C, Tdew=9.7C Zero Air at 1200psi, AMP Air 408.97 at 900 Tdewspan=16.00 CO2 zero 0.8982 -> .8992 Offset: 3.69ppm CO2 span 0.9965 -> 1.0033 Offset: -3.58ppm H2O zero 0.8454 -> .8465 Offset: 6.1ppm H2O span 0.9813 -> .9832 Offset: -.03ppm Notes:
2019-08-22	0418	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on Vaira to replace sn 75H-2668 for calibration.
2019-11-18	0418	LI-7500A	Calibration	Lab	Last calibration: 2019-08-21 AGC=94.4 SDM=0 DAC1=- DAC2=- Ambient P=100.4kPa, Tair=25.2C, Tdew=8.5C Zero Air at 950psi, AMP CA04396 408.97 at 600 Tdewspan=20.0 CO2 zero 0.899 -> 0.8991 Offset: 0.35ppm CO2 span 0.9976 -> 0.9988 Offset: -0.72ppm H2O zero 0.8466 -> 0.8482 Offset: 9.4ppm H2O span 0.9818 -> 0.9812 Offset: 0.03ppm Notes: Removed from Vaira due to no readings but has test fine in the lab - no missing data in about a week.
2019-11-07	0418	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira due to failure - probably bad source or detector. Replaced by sn 75H-2180 from Tonzi Floor.
2019-11-18	0418	LI-7500A	Calibration	Lab	Last calibration: 2019-08-21 AGC=94.4 SDM=0 DAC1=- DAC2=- Ambient P=100.4kPa, Tair=25.2C, Tdew=8.5C Zero Air at 950psi, AMP CA04396 408.97 at 600 Tdewspan=20.0 CO2 zero 0.899 -> 0.8991 Offset: 0.35ppm CO2 span 0.9976 -> 0.9988 Offset: -0.72ppm H2O zero 0.8466 -> 0.8482 Offset: 9.4ppm H2O span 0.9818 -> 0.9812 Offset: 0.03ppm Notes: Removed from Vaira due to no readings but has test fine in the lab - no missing data in about a week.
2020-12-01	0418	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 75H-2176 for calibration.
2021-03-03	0418	LI-7500A	Calibration	Lab	Last calibration: 2020-11-24 AGC=97.7 SDM= DAC1= DAC2= Ambient P=99.3kPa, Tair=25.7C, Tdew=8.2C Zero Air at 450psi, AMP CA3923 474.19 at 550 Tdewspan=20.00 CO2 zero 0.8995 -> .9003 Offset: 3.01ppm CO2 span 1.0034 -> .9978 Offset: 3.49ppm H2O zero 0.8465 -> .8461 Offset: -2.0ppm H2O span 0.9847 -> .9906 Offset: -.14ppm Notes: I had to add more water the dewpt generator to get it to stay at the set dewpoint, otherwise it would just slowly decline forever. Calibrated earlier in the day, but I had forgotten to update the pressure coefficients in the config file for LI-7550 sn AIU-614. With the incorrect coefficients, offsets were (CO2 zero = 0.78, CO2 span = 0.23, H2O zero = -4.6, H2O span = 0.04).
2021-03-02	0418	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 75H-2667.
2021-03-03	0418	LI-7500A	Calibration	Lab	Last calibration: 2020-11-24 AGC=97.7 SDM= DAC1= DAC2= Ambient P=99.3kPa, Tair=25.7C, Tdew=8.2C Zero Air at 450psi, AMP CA3923 474.19 at 550 Tdewspan=20.00 CO2 zero 0.8995 -> .9003 Offset: 3.01ppm CO2 span 1.0034 -> .9978 Offset: 3.49ppm H2O zero 0.8465 -> .8461 Offset: -2.0ppm H2O span 0.9847 -> .9906 Offset: -.14ppm Notes: I had to add more water the dewpt generator to get it to stay at the set dewpoint, otherwise it would just slowly decline forever. Calibrated earlier in the day, but I had forgotten to update the pressure coefficients in the config file for LI-7550 sn AIU-614. With the incorrect coefficients, offsets were (CO2 zero = 0.78, CO2 span = 0.23, H2O zero = -4.6, H2O span = 0.04).
2013-02-27	0976	LI-7500	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira tower by Siyan to replace sn 0418 for calibration.
2013-04-26	0976	LI-7500	Calibration	Lab	Last calibration: 2013-02-26 AGC=58 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.98kPa, Tair=18.15C, Tdew=9.01C Zero air at 1700psi, CO2 in air 392.30 at 1900 Tdewspan=15.04 CO2 zero 0.8594 -> 0.8590 Offset: -1.65ppm CO2 span 1.0105 -> 1.0096 Offset: 0.45ppm H2O zero 0.629 -> 0.6313 Offset: 16.4ppm H2O span 1.0101 -> 0.9941 Offset: 0.28ppm Notes:
2013-04-24	0976	LI-7500	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira tower for calibration. Replaced by sn 0042
2013-04-26	0976	LI-7500	Calibration	Lab	Last calibration: 2013-02-26 AGC=58 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.98kPa, Tair=18.15C, Tdew=9.01C Zero air at 1700psi, CO2 in air 392.30 at 1900 Tdewspan=15.04 CO2 zero 0.8594 -> 0.8590 Offset: -1.65ppm CO2 span 1.0105 -> 1.0096 Offset: 0.45ppm H2O zero 0.629 -> 0.6313 Offset: 16.4ppm H2O span 1.0101 -> 0.9941 Offset: 0.28ppm Notes:
2015-01-07	0976	LI-7500	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira Tower to replace 0035 for calibration.
2015-07-15	0976	LI-7500	Calibration	Lab	Last calibration: 2015-01-06 AGC=57 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.2kPa, Tair=21.92C, Tdew=15.55C Zero Air at 800psi, God CO2 421.22 at 850 Tdewspan=11.08 CO2 zero 0.8594 -> 0.8602 Offset: 3.29ppm CO2 span 1.0091 -> 1.0100 Offset: -0.62ppm H2O zero 0.6314 -> 0.6307 Offset: -5.2ppm H2O span 1.0439 -> 1.0182 Offset: 0.51ppm Notes:
2015-04-21	0976	LI-7500	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira tower for calibration. Replaced by sn 0041
2015-07-15	0976	LI-7500	Calibration	Lab	Last calibration: 2015-01-06 AGC=57 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.2kPa, Tair=21.92C, Tdew=15.55C Zero Air at 800psi, God CO2 421.22 at 850 Tdewspan=11.08 CO2 zero 0.8594 -> 0.8602 Offset: 3.29ppm CO2 span 1.0091 -> 1.0100 Offset: -0.62ppm H2O zero 0.6314 -> 0.6307 Offset: -5.2ppm H2O span 1.0439 -> 1.0182 Offset: 0.51ppm Notes:
2015-07-20	0976	LI-7500	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira Tower to replace sn 0041 for calibration
2016-02-22	0976	LI-7500	Calibration	Lab	Last calibration: 2015-07-15 AGC=57 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=101.18kPa, Tair=18.28C, Tdew=9.41C Zero Air at 650psi, God CO2 421.22 at 700 Tdewspan=11.09 CO2 zero 0.8602 -> 0.8594 Offset: -6.0ppm CO2 span 1.01 -> 1.0112 Offset: -0.62ppm H2O zero 0.6307 -> 0.6332 Offset: 18.4ppm H2O span 1.0182 -> 1.0281 Offset: -0.2ppm Notes:
2015-11-03	0976	LI-7500	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira Tower for calibration. Replaced by sn 0041.
2016-02-22	0976	LI-7500	Calibration	Lab	Last calibration: 2015-07-15 AGC=57 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=101.18kPa, Tair=18.28C, Tdew=9.41C Zero Air at 650psi, God CO2 421.22 at 700 Tdewspan=11.09 CO2 zero 0.8602 -> 0.8594 Offset: -6.0ppm CO2 span 1.01 -> 1.0112 Offset: -0.62ppm H2O zero 0.6307 -> 0.6332 Offset: 18.4ppm H2O span 1.0182 -> 1.0281 Offset: -0.2ppm Notes:
2016-02-23	0976	LI-7500	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira tower to replace sn 0041 for calibration.
2016-08-15	0976	LI-7500	Calibration	Lab	Last calibration: 2016-02-22 AGC=58 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.24kPa, Tair=21.70C, Tdew=12.08C Zero Air at 500psi, God CO2 421.22 at 500 Tdewspan=16.00 CO2 zero 0.8594 -> 0.8594 Offset: 0.15ppm CO2 span 1.0112 -> 1.0083 Offset: 1.48ppm H2O zero 0.6332 -> 0.6317 Offset: -10.5ppm H2O span 1.0281 -> 1.0114 Offset: 0.37ppm Notes: Did note use the hood thermistor. Large change in H2O zero
2016-05-10	0976	LI-7500	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira tower for calibration. Replaced by sn 0073.
2016-08-15	0976	LI-7500	Calibration	Lab	Last calibration: 2016-02-22 AGC=58 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.24kPa, Tair=21.70C, Tdew=12.08C Zero Air at 500psi, God CO2 421.22 at 500 Tdewspan=16.00 CO2 zero 0.8594 -> 0.8594 Offset: 0.15ppm CO2 span 1.0112 -> 1.0083 Offset: 1.48ppm H2O zero 0.6332 -> 0.6317 Offset: -10.5ppm H2O span 1.0281 -> 1.0114 Offset: 0.37ppm Notes: Did note use the hood thermistor. Large change in H2O zero
2010-10-07	1594	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on Vaira Tower so sn 0418 could be removed for calibration.
2011-01-19	1594	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira Tower for calibrations.
2011-10-18	1594	LI-7500A	Installed	Gas Analyzer CO2/H2O	This IRGA was installed on the Vaira tower to replace Frank's IRGA that was installed temporarily.
2012-01-04	1594	LI-7500A	Removed	Gas Analyzer CO2/H2O	Swapped off of Vaira tower for calibration. Replaced with serial number ??.
2018-06-26	1594	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace en 75H-2182 for calibration
2018-09-27	1594	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira Tower for calibration. Replaced by sn 0065.
2023-06-16	1594	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 75H-2514 for calibration.
2023-09-19	1594	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0065.
2017-04-10	75H-2150	LI-7500A	Installed	Gas Analyzer CO2/H2O	Added to the Vaira eddy tower for the Ameriflux inter-comparison and the transition to newer LI-7500A eddy systems.
2017-05-30	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2017-03-14 AGC=97.2 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=19.9C, Tdew=12.2C Zero Air at 1050psi, NOAA Air 402.69 at 1600 Tdewspan=16.00 CO2 zero 0.9014 -> .9024 Offset: 4.23ppm CO2 span 1 -> 1.0194 Offset: -9.8ppm H2O zero 0.8651 -> .8664 Offset: 9.3ppm H2O span 1.0094 -> .9975 Offset: .26ppm Notes:
2017-05-11	75H-2150	LI-7500A	Removed		Removed from Vaira because the Ameriflux intercomparison finished and because we received new 7500A and sonics from Ameriflux. This head was replaced with sn 0035 that has been freshly upgraded from 7500 to 7500A.
2017-05-30	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2017-03-14 AGC=97.2 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=19.9C, Tdew=12.2C Zero Air at 1050psi, NOAA Air 402.69 at 1600 Tdewspan=16.00 CO2 zero 0.9014 -> .9024 Offset: 4.23ppm CO2 span 1 -> 1.0194 Offset: -9.8ppm H2O zero 0.8651 -> .8664 Offset: 9.3ppm H2O span 1.0094 -> .9975 Offset: .26ppm Notes:
2019-01-04	75H-2176	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira tower to replace sn 0418 for calibration.
2019-07-24	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2019-01-02 AGC=102.0 SDM= DAC1= DAC2= Ambient P=100.5kPa, Tair=26.1C, Tdew=14.5C Zero Air at 1000psi, AMP CA4396 408.97 at 800 Tdewspan=20.00 CO2 zero 0.8676 -> .8672 Offset: -2.14ppm CO2 span 1.0114 -> 1.0061 Offset: 2.7ppm H2O zero 0.8525 -> .8521 Offset: -2.4ppm H2O span 0.8206 -> .9182 Offset: .05ppm Notes: When SS was 102.0, I reset it to 100.
2019-04-30	75H-2176	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 75H-2668.
2019-07-24	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2019-01-02 AGC=102.0 SDM= DAC1= DAC2= Ambient P=100.5kPa, Tair=26.1C, Tdew=14.5C Zero Air at 1000psi, AMP CA4396 408.97 at 800 Tdewspan=20.00 CO2 zero 0.8676 -> .8672 Offset: -2.14ppm CO2 span 1.0114 -> 1.0061 Offset: 2.7ppm H2O zero 0.8525 -> .8521 Offset: -2.4ppm H2O span 0.8206 -> .9182 Offset: .05ppm Notes: When SS was 102.0, I reset it to 100.
2020-08-26	75H-2176	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 75H-2669 for calibration.
2020-12-02	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2020-08-25 AGC=101 SDM= DAC1= DAC2= Ambient P=100.8kPa, Tair=25.1C, Tdew=3.3C Zero Air at 450psi, AMP CA4396 408.97 at 300 Tdewspan=20.00 CO2 zero 0.8671 -> .8673 Offset: .59ppm CO2 span 1.0055 -> 1.009 Offset: -1.94ppm H2O zero 0.8526 -> .8531 Offset: 3.0ppm H2O span 0.9246 -> .9238 Offset: .02ppm Notes:
2020-12-01	75H-2176	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0418.
2020-12-02	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2020-08-25 AGC=101 SDM= DAC1= DAC2= Ambient P=100.8kPa, Tair=25.1C, Tdew=3.3C Zero Air at 450psi, AMP CA4396 408.97 at 300 Tdewspan=20.00 CO2 zero 0.8671 -> .8673 Offset: .59ppm CO2 span 1.0055 -> 1.009 Offset: -1.94ppm H2O zero 0.8526 -> .8531 Offset: 3.0ppm H2O span 0.9246 -> .9238 Offset: .02ppm Notes:
2022-12-06	75H-2176	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0065 for calibration.
2023-03-29	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2022-12-05 AGC=100.1 SDM= DAC1= DAC2= Ambient P=99.8kPa, Tair=19.16C, Tdew=7.7C Zero Air at 1300psi, AMP CA04119 524.77 at 1150 Tdewspan=16.00 CO2 zero 0.8678 -> .8679 Offset: .37ppm CO2 span 1.0144 -> 1.0130 Offset: .93ppm H2O zero 0.8553 -> .8562 Offset: 5.2ppm H2O span 0.9281 -> .9316 Offset: -.08ppm Notes:
2023-03-16	75H-2176	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 75H-2514.
2023-03-29	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2022-12-05 AGC=100.1 SDM= DAC1= DAC2= Ambient P=99.8kPa, Tair=19.16C, Tdew=7.7C Zero Air at 1300psi, AMP CA04119 524.77 at 1150 Tdewspan=16.00 CO2 zero 0.8678 -> .8679 Offset: .37ppm CO2 span 1.0144 -> 1.0130 Offset: .93ppm H2O zero 0.8553 -> .8562 Offset: 5.2ppm H2O span 0.9281 -> .9316 Offset: -.08ppm Notes:
2019-11-07	75H-2180	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Tonzi Floor for use at Vaira where the 7500 head had died probably with a bad source or detector.
2020-02-03	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2019-08-21 AGC=98.8 SDM=0 DAC1=- DAC2=- Ambient P=100.9kPa, Tair=22.9C, Tdew=-7.4C Zero Air at 850psi, AMP CA04396 408.97 at 575 Tdewspan=16.0 CO2 zero 0.9137 -> 0.9137 Offset: -0.22ppm CO2 span 1.0266 -> 1.0319 Offset: -2.61ppm H2O zero 0.8884 -> 0.8884 Offset: -0.1ppm H2O span 1.0282 -> 1.0125 Offset: 0.32ppm Notes: Very dry ambient air
2019-11-07	75H-2180	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on Vaira to replace sn 0418 that failed probably due to bad source or detector.
2020-02-03	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2019-08-21 AGC=98.8 SDM=0 DAC1=- DAC2=- Ambient P=100.9kPa, Tair=22.9C, Tdew=-7.4C Zero Air at 850psi, AMP CA04396 408.97 at 575 Tdewspan=16.0 CO2 zero 0.9137 -> 0.9137 Offset: -0.22ppm CO2 span 1.0266 -> 1.0319 Offset: -2.61ppm H2O zero 0.8884 -> 0.8884 Offset: -0.1ppm H2O span 1.0282 -> 1.0125 Offset: 0.32ppm Notes: Very dry ambient air
2019-11-19	75H-2180	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0035.
2020-02-03	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2019-08-21 AGC=98.8 SDM=0 DAC1=- DAC2=- Ambient P=100.9kPa, Tair=22.9C, Tdew=-7.4C Zero Air at 850psi, AMP CA04396 408.97 at 575 Tdewspan=16.0 CO2 zero 0.9137 -> 0.9137 Offset: -0.22ppm CO2 span 1.0266 -> 1.0319 Offset: -2.61ppm H2O zero 0.8884 -> 0.8884 Offset: -0.1ppm H2O span 1.0282 -> 1.0125 Offset: 0.32ppm Notes: Very dry ambient air
2024-09-27	75H-2180	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 75H-2182 for calibration.
2018-03-06	75H-2182	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0065.
2018-07-10	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2018-03-05 AGC=87 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=26.3C, Tdew=13.00C Zero Air at 200psi, LBL Air 408.97 at 1400 Tdewspan=16.00 CO2 zero 0.8844 -> .8841 Offset: -.91ppm CO2 span 1.0217 -> 1.0168 Offset: 2.33ppm H2O zero 0.8453 -> .845 Offset: -1.7ppm H2O span 1.0169 -> 1.0202 Offset: -.08ppm Notes:
2018-06-26	75H-2182	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 1594
2018-07-10	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2018-03-05 AGC=87 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=26.3C, Tdew=13.00C Zero Air at 200psi, LBL Air 408.97 at 1400 Tdewspan=16.00 CO2 zero 0.8844 -> .8841 Offset: -.91ppm CO2 span 1.0217 -> 1.0168 Offset: 2.33ppm H2O zero 0.8453 -> .845 Offset: -1.7ppm H2O span 1.0169 -> 1.0202 Offset: -.08ppm Notes:
2021-12-02	75H-2182	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0042 for calibration.
2022-03-22	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2021-11-30 AGC=99.4 SDM=0 DAC1=- DAC2=- Ambient P=100.8kPa, Tair=29.6C, Tdew=10.7C Zero Air at 900psi, AMP CA04119 524.77 at 1650 Tdewspan=20.0 CO2 zero 0.885 -> 0.8849 Offset: -0.6ppm CO2 span 1.0219 -> 1.0222 Offset: -0.07ppm H2O zero 0.847 -> 0.8483 Offset: 7.9ppm H2O span 1.0264 -> 1.0312 Offset: -0.1ppm Notes:
2022-03-10	75H-2182	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 75H-2667.
2022-03-22	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2021-11-30 AGC=99.4 SDM=0 DAC1=- DAC2=- Ambient P=100.8kPa, Tair=29.6C, Tdew=10.7C Zero Air at 900psi, AMP CA04119 524.77 at 1650 Tdewspan=20.0 CO2 zero 0.885 -> 0.8849 Offset: -0.6ppm CO2 span 1.0219 -> 1.0222 Offset: -0.07ppm H2O zero 0.847 -> 0.8483 Offset: 7.9ppm H2O span 1.0264 -> 1.0312 Offset: -0.1ppm Notes:
2024-06-19	75H-2182	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0042 for calibration.
2024-10-22	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2024-06-17 AGC=100.8 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.7kPa, Tair=26.3C, Tdew=10.7C Zero Air at 1050psi, AMP FB04319 514.07 at 825 Tdewspan=20.00 CO2 zero 0.885 -> .8849 Offset: -.42ppm CO2 span 1.0141 -> 1.0136 Offset: .43ppm H2O zero 0.8332 -> .8326 Offset: -4.3ppm H2O span 1.0365 -> 1.0334 Offset: .07ppm Notes:
2024-09-27	75H-2182	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 75H-2180.
2024-10-22	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2024-06-17 AGC=100.8 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.7kPa, Tair=26.3C, Tdew=10.7C Zero Air at 1050psi, AMP FB04319 514.07 at 825 Tdewspan=20.00 CO2 zero 0.885 -> .8849 Offset: -.42ppm CO2 span 1.0141 -> 1.0136 Offset: .43ppm H2O zero 0.8332 -> .8326 Offset: -4.3ppm H2O span 1.0365 -> 1.0334 Offset: .07ppm Notes:
2017-08-17	75H-2514	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira Tower to replace sn 0035 for calibration
2017-12-15	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2017-08-14 AGC=102.8 SDM=0 DAC1=0 DAC2=0 Ambient P=100.7kPa, Tair=22.1C, Tdew=7.9C Zero Air at 250psi, LBL Air 408.97 at 1700 Tdewspan=16.00 CO2 zero 0.905 -> .9052 Offset: .8ppm CO2 span 1.0107 -> 1.0118 Offset: -.5ppm H2O zero 0.8378 -> .8385 Offset: 4.3ppm H2O span 1.0094 -> 1.0103 Offset: -.01ppm Notes:
2017-11-29	75H-2514	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Vaira tower for calibration. Replaced by sn 0065
2017-12-15	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2017-08-14 AGC=102.8 SDM=0 DAC1=0 DAC2=0 Ambient P=100.7kPa, Tair=22.1C, Tdew=7.9C Zero Air at 250psi, LBL Air 408.97 at 1700 Tdewspan=16.00 CO2 zero 0.905 -> .9052 Offset: .8ppm CO2 span 1.0107 -> 1.0118 Offset: -.5ppm H2O zero 0.8378 -> .8385 Offset: 4.3ppm H2O span 1.0094 -> 1.0103 Offset: -.01ppm Notes:
2023-03-16	75H-2514	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 75H-2176 for calibration.
2023-07-10	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2023-03-14 AGC=100.4 SDM= DAC1= DAC2= AIU sn AIU-1569, Presure A0=58.004, A1=15.479 Ambient P=100.9kPa, Tair=21.7C, Tdew=12.2C Zero Air at 1000psi, AMP CA04119 524.77 at 950 Tdewspan=16.00 CO2 zero 0.9053 -> .9049 Offset: -1.85ppm CO2 span 1.0169 -> 1.0199 Offset: -2.16ppm H2O zero 0.8408 -> .8426 Offset: 13.0ppm H2O span 1.0243 -> 1.0244 Offset: 0.0ppm Notes: Slightly larger H2O zero than usual but span was right no. Calibrated in vertical orientation
2023-06-16	75H-2514	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 1594.
2023-07-10	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2023-03-14 AGC=100.4 SDM= DAC1= DAC2= AIU sn AIU-1569, Presure A0=58.004, A1=15.479 Ambient P=100.9kPa, Tair=21.7C, Tdew=12.2C Zero Air at 1000psi, AMP CA04119 524.77 at 950 Tdewspan=16.00 CO2 zero 0.9053 -> .9049 Offset: -1.85ppm CO2 span 1.0169 -> 1.0199 Offset: -2.16ppm H2O zero 0.8408 -> .8426 Offset: 13.0ppm H2O span 1.0243 -> 1.0244 Offset: 0.0ppm Notes: Slightly larger H2O zero than usual but span was right no. Calibrated in vertical orientation
2021-03-02	75H-2667	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0418 for calibration.
2021-06-07	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2021-03-01 AGC=102 SDM= DAC1= DAC2= Ambient P=99.5kPa, Tair=20.8C, Tdew=9.2C Zero Air at 250psi, AMP CA04119 524.77 at 1750 Tdewspan=16.00 CO2 zero 0.9423 -> .9422 Offset: -.43ppm CO2 span 1.0092 -> 1.0122 Offset: -2.23ppm H2O zero 0.8385 -> .8404 Offset: 11.8ppm H2O span 1.0147 -> 1.0198 Offset: -.1ppm Notes:
2021-06-02	75H-2667	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0065.
2021-06-07	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2021-03-01 AGC=102 SDM= DAC1= DAC2= Ambient P=99.5kPa, Tair=20.8C, Tdew=9.2C Zero Air at 250psi, AMP CA04119 524.77 at 1750 Tdewspan=16.00 CO2 zero 0.9423 -> .9422 Offset: -.43ppm CO2 span 1.0092 -> 1.0122 Offset: -2.23ppm H2O zero 0.8385 -> .8404 Offset: 11.8ppm H2O span 1.0147 -> 1.0198 Offset: -.1ppm Notes:
2022-03-10	75H-2667	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 75H-2182 for calibration.
2022-09-15	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2022-03-02 AGC=100.4 SDM= DAC1= DAC2= Ambient P=100.5kPa, Tair=20.6C, Tdew=13.4C Zero Air at 1875psi, AMP CA04119 524.77 at 1350 Tdewspan=20.00 CO2 zero 0.9412 -> .9413 Offset: .3ppm CO2 span 1.0171 -> 1.0204 Offset: -2.27ppm H2O zero 0.841 -> .8407 Offset: -1.7ppm H2O span 1.018 -> 1.0338 Offset: .01ppm Notes: Calibrated with AMP 7550 sn AIU-1039. At first, large H2O span offset (-0.32) than usual. The condenser water tube in the back was low on water. I opened the cap to let water level rise again. Afterwards, H2O span was right on (offset 0.01).
2022-09-14	75H-2667	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0065.
2022-09-15	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2022-03-02 AGC=100.4 SDM= DAC1= DAC2= Ambient P=100.5kPa, Tair=20.6C, Tdew=13.4C Zero Air at 1875psi, AMP CA04119 524.77 at 1350 Tdewspan=20.00 CO2 zero 0.9412 -> .9413 Offset: .3ppm CO2 span 1.0171 -> 1.0204 Offset: -2.27ppm H2O zero 0.841 -> .8407 Offset: -1.7ppm H2O span 1.018 -> 1.0338 Offset: .01ppm Notes: Calibrated with AMP 7550 sn AIU-1039. At first, large H2O span offset (-0.32) than usual. The condenser water tube in the back was low on water. I opened the cap to let water level rise again. Afterwards, H2O span was right on (offset 0.01).
2019-04-30	75H-2668	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Vaira tower to replace sn 74H-2176 for calibration.
2019-10-30	75H-2668	LI-7500A	Calibration	Lab	Last calibration: 2019-04-26 AGC=100.3 SDM=0 DAC1=- DAC2=- Ambient P=101.0kPa, Tair=26.9C, Tdew=-10.7C Zero Air at 900psi, AMP CA04396 408.97 at 800 Tdewspan=20.0 CO2 zero 0.9391 -> 0.9393 Offset: 1.05ppm CO2 span 1.0169 -> 1.0160 Offset: 0.53ppm H2O zero 0.9069 -> 0.9096 Offset: -0.9ppm H2O span 1.0139 -> 1.0143 Offset: 0ppm Notes: Ambient air was very dry. Joe
2019-08-22	75H-2668	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 0418.
2019-10-30	75H-2668	LI-7500A	Calibration	Lab	Last calibration: 2019-04-26 AGC=100.3 SDM=0 DAC1=- DAC2=- Ambient P=101.0kPa, Tair=26.9C, Tdew=-10.7C Zero Air at 900psi, AMP CA04396 408.97 at 800 Tdewspan=20.0 CO2 zero 0.9391 -> 0.9393 Offset: 1.05ppm CO2 span 1.0169 -> 1.0160 Offset: 0.53ppm H2O zero 0.9069 -> 0.9096 Offset: -0.9ppm H2O span 1.0139 -> 1.0143 Offset: 0ppm Notes: Ambient air was very dry. Joe
2020-05-23	75H-2669	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Vaira to replace sn 0073 for calibration.
2020-08-27	75H-2669	LI-7500A	Calibration	Lab	Last calibration: 2020-05-22 AGC=100.9 SDM= DAC1= DAC2= Ambient P=99.9kPa, Tair=23.7C, Tdew=12.4C Zero Air at 600psi, AMP CA4396 408.97 at 425 Tdewspan=20.00 CO2 zero 0.9185 -> .9184 Offset: -.32ppm CO2 span 1.0124 -> 1.0118 Offset: .52ppm H2O zero 0.8999 -> .9012 Offset: 8.3ppm H2O span 1.0094 -> 1.0121 Offset: -.06ppm Notes:
2020-08-26	75H-2669	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Vaira for calibration. Replaced by sn 75H-2176.
2020-08-27	75H-2669	LI-7500A	Calibration	Lab	Last calibration: 2020-05-22 AGC=100.9 SDM= DAC1= DAC2= Ambient P=99.9kPa, Tair=23.7C, Tdew=12.4C Zero Air at 600psi, AMP CA4396 408.97 at 425 Tdewspan=20.00 CO2 zero 0.9185 -> .9184 Offset: -.32ppm CO2 span 1.0124 -> 1.0118 Offset: .52ppm H2O zero 0.8999 -> .9012 Offset: 8.3ppm H2O span 1.0094 -> 1.0121 Offset: -.06ppm Notes:

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