Equipment and Calibration

Equipment history at Mayberry

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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
2011-09-15	0035	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Mayberry tower to replace 0065 for calibration.
2012-05-16	0035	LI-7500A	Calibration	Lab	Last calibration: 2011-09-14 AGC=50 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.19kPa, Tair=23.04C, Tdew=8.4C dry air at 16psi, CO2 436.53 at 1500 Tdewspan=13.7 CO2 zero 0.9338 -> 0.9419 Offset: ppm CO2 span 1.0108 -> 0.8842 Offset: ppm H2O zero 0.7353 -> 1.0055 Offset: ppm H2O span 0.9843 -> 0.9990 Offset: ppm Notes: recently fixed by Li-cor; double check in the lab conditions; no calibration applied yet.
2012-01-17	0035	LI-7500A	Removed	Gas Analyzer CO2/H2O	Swapped off the Mayberry tower for calibration. Replaced by sn 1594.
2012-05-16	0035	LI-7500A	Calibration	Lab	Last calibration: 2011-09-14 AGC=50 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.19kPa, Tair=23.04C, Tdew=8.4C dry air at 16psi, CO2 436.53 at 1500 Tdewspan=13.7 CO2 zero 0.9338 -> 0.9419 Offset: ppm CO2 span 1.0108 -> 0.8842 Offset: ppm H2O zero 0.7353 -> 1.0055 Offset: ppm H2O span 0.9843 -> 0.9990 Offset: ppm Notes: recently fixed by Li-cor; double check in the lab conditions; no calibration applied yet.
2020-05-21	0035	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry to replace sn 0065 for calibration.
2020-11-23	0035	LI-7500A	Calibration	Lab	Last calibration: 2020-05-22 AGC=99.7 SDM= DAC1= DAC2= Ambient P=100.5kPa, Tair=23.2C, Tdew=8.7C Zero Air at 550psi, AMP CA4396 408.97 at 400 Tdewspan=20.00 CO2 zero 0.9677 -> .9375 Offset: -1.07ppm CO2 span 1.0289 -> 1.0190 Offset: 5.12ppm H2O zero 0.8989 -> .8980 Offset: -5.6ppm H2O span 1.0271 -> 1.035 Offset: -.16ppm Notes: Relatively large change in CO2 span again, but with opposite sign. Net offset since 2020-02-19 is -1.55 ppm.
2020-08-28	0035	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry for calibration. Replaced by sn 75H-2669.
2020-11-23	0035	LI-7500A	Calibration	Lab	Last calibration: 2020-05-22 AGC=99.7 SDM= DAC1= DAC2= Ambient P=100.5kPa, Tair=23.2C, Tdew=8.7C Zero Air at 550psi, AMP CA4396 408.97 at 400 Tdewspan=20.00 CO2 zero 0.9677 -> .9375 Offset: -1.07ppm CO2 span 1.0289 -> 1.0190 Offset: 5.12ppm H2O zero 0.8989 -> .8980 Offset: -5.6ppm H2O span 1.0271 -> 1.035 Offset: -.16ppm Notes: Relatively large change in CO2 span again, but with opposite sign. Net offset since 2020-02-19 is -1.55 ppm.
2023-01-18	0035	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry to replace sn 75H-2514 for calibration.
2023-04-10	0035	LI-7500A	Calibration	Lab	Last calibration: 2023-01-13 AGC=99.3 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=21.0C, Tdew=10.5C Zero Air at 1400psi, AMP CA04119 524.77 at 1150 Tdewspan=16.00 CO2 zero 0.9374 -> .9375 Offset: .28ppm CO2 span 1.0295 -> 1.0253 Offset: 2.83ppm H2O zero 0.9003 -> .8994 Offset: -5.1ppm H2O span 1.0369 -> 1.0291 Offset: .16ppm Notes: Used "Span" point of 524.67 to get sensor to read 524.77ppm after span
2023-04-03	0035	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry for calibration. Replaced by sn 0418.
2023-04-10	0035	LI-7500A	Calibration	Lab	Last calibration: 2023-01-13 AGC=99.3 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=21.0C, Tdew=10.5C Zero Air at 1400psi, AMP CA04119 524.77 at 1150 Tdewspan=16.00 CO2 zero 0.9374 -> .9375 Offset: .28ppm CO2 span 1.0295 -> 1.0253 Offset: 2.83ppm H2O zero 0.9003 -> .8994 Offset: -5.1ppm H2O span 1.0369 -> 1.0291 Offset: .16ppm Notes: Used "Span" point of 524.67 to get sensor to read 524.77ppm after span
2024-01-04	0041	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry to replace sn 0073 for calibration.
2024-06-17	0041	LI-7500A	Calibration	Lab	Last calibration: 2024-01-03 AGC=100.0 SDM=0 DAC1=- DAC2=- AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.1kPa, Tair=20.5C, Tdew=8.8C Zero Air at 1750psi, AMP CA04119 524.77 at 400 Tdewspan=16.0 CO2 zero 0.9963 -> 0.9958 Offset: -1.60ppm CO2 span 1.0217 -> 1.0176 Offset: 2.93ppm H2O zero 0.8245 -> 0.8238 Offset: -3.9ppm H2O span 1.0365 -> 1.0341 Offset: 0.06ppm Notes: Reset SS from 101.5
2024-04-11	0041	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry for calibration. Replaced by sn 75H-2667.
2024-06-17	0041	LI-7500A	Calibration	Lab	Last calibration: 2024-01-03 AGC=100.0 SDM=0 DAC1=- DAC2=- AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.1kPa, Tair=20.5C, Tdew=8.8C Zero Air at 1750psi, AMP CA04119 524.77 at 400 Tdewspan=16.0 CO2 zero 0.9963 -> 0.9958 Offset: -1.60ppm CO2 span 1.0217 -> 1.0176 Offset: 2.93ppm H2O zero 0.8245 -> 0.8238 Offset: -3.9ppm H2O span 1.0365 -> 1.0341 Offset: 0.06ppm Notes: Reset SS from 101.5
2011-02-03	0042	LI-7500A	Installed	Gas Analyzer CO2/H2O	This sensor was installed on the tower. sn 0073 was removed for calibration.
2011-06-15	0042	LI-7500A	Calibration	Lab	Last calibration: 2011-02-02 AGC=68 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.3kPa Tair=21.98C, Tdew=11.9C zero air at 1450psi, co2 in air 597.4ppm 100psi Tdewspan=16.9 CO2 zero 0.9605 -> 0.9587 Offset: -8.14ppm CO2 span 0.9855 -> 0.9796 Offset: 11.6ppm H2O zero 0.7877 -> 0.7886 Offset: -2.9mmol/m3 H2O span 1.1467 -> 0.9667 Offset: 4.62C Notes: I initiall tried to calibrate on 6/14 but was rushed and got some odd behavior so did a better calibration on 6/15. The offsets are estimates based on the two calibrations.
2011-05-25	0042	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Mayberry tower for calibration. Replaced by sn 0065.
2011-06-15	0042	LI-7500A	Calibration	Lab	Last calibration: 2011-02-02 AGC=68 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.3kPa Tair=21.98C, Tdew=11.9C zero air at 1450psi, co2 in air 597.4ppm 100psi Tdewspan=16.9 CO2 zero 0.9605 -> 0.9587 Offset: -8.14ppm CO2 span 0.9855 -> 0.9796 Offset: 11.6ppm H2O zero 0.7877 -> 0.7886 Offset: -2.9mmol/m3 H2O span 1.1467 -> 0.9667 Offset: 4.62C Notes: I initiall tried to calibrate on 6/14 but was rushed and got some odd behavior so did a better calibration on 6/15. The offsets are estimates based on the two calibrations.
2019-07-25	0042	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at MB to replace 75H-2182, which was brought back to the lab for calibration.
2019-11-12	0042	LI-7500A	Calibration	Lab	Last calibration: 2019-07-24 AGC=99.5 SDM= DAC1= DAC2= Ambient P=100.5kPa, Tair=26.7C, Tdew=11.3C Zero Air at 950psi, AMP CA4396 408.97 at 700 Tdewspan=16.00 CO2 zero 0.9481 -> .9481 Offset: .26ppm CO2 span 1.0049 -> 1.0091 Offset: -2.31ppm H2O zero 0.8433 -> .8449 Offset: 10.0ppm H2O span 1.0179 -> 1.0139 Offset: .08ppm Notes:
2019-10-31	0042	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry for calibration. Replaced by sn 1594.
2019-11-12	0042	LI-7500A	Calibration	Lab	Last calibration: 2019-07-24 AGC=99.5 SDM= DAC1= DAC2= Ambient P=100.5kPa, Tair=26.7C, Tdew=11.3C Zero Air at 950psi, AMP CA4396 408.97 at 700 Tdewspan=16.00 CO2 zero 0.9481 -> .9481 Offset: .26ppm CO2 span 1.0049 -> 1.0091 Offset: -2.31ppm H2O zero 0.8433 -> .8449 Offset: 10.0ppm H2O span 1.0179 -> 1.0139 Offset: .08ppm Notes:
2021-05-26	0042	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry to replace sn 0418 for calibration.
2021-08-31	0042	LI-7500A	Calibration	Lab	Last calibration: 2021-05-25 AGC=99.8 SDM=0 DAC1=- DAC2=- Ambient P=99.7kPa, Tair=26.4C, Tdew=13.15C Zero Air at 1800psi, AMP CA04119 524.77 at 1700 Tdewspan=20.0 CO2 zero 0.9481 -> 0.9479 Offset: -0.78ppm CO2 span 1.0041 -> 1.0063 Offset: -1.62ppm H2O zero 0.8437 -> 0.8448 Offset: 7.1ppm H2O span 1.0149 -> 1.0163 Offset: -0.04ppm Notes:
2021-06-16	0042	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry for due to bad pressure reading. Replaced by sn 75H-2180.
2021-08-31	0042	LI-7500A	Calibration	Lab	Last calibration: 2021-05-25 AGC=99.8 SDM=0 DAC1=- DAC2=- Ambient P=99.7kPa, Tair=26.4C, Tdew=13.15C Zero Air at 1800psi, AMP CA04119 524.77 at 1700 Tdewspan=20.0 CO2 zero 0.9481 -> 0.9479 Offset: -0.78ppm CO2 span 1.0041 -> 1.0063 Offset: -1.62ppm H2O zero 0.8437 -> 0.8448 Offset: 7.1ppm H2O span 1.0149 -> 1.0163 Offset: -0.04ppm Notes:
2011-05-25	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Mayberry tower to swap out sn 0042 for calibration
2011-09-27	0065	LI-7500A	Calibration	Lab	Last calibration: 2011-05-24 AGC=65 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=99.28kPa, Tair=26.94C, Tdew=10.69C zero air at 1000psi, co2 in air 405.85 at 1500 Tdewspan=13.4 CO2 zero 0.8748 -> 0.8741 Offset: -2.5ppm CO2 span 0.9939 -> 0.9936 Offset: 0.05ppm H2O zero 0.6408 -> 0.6341 Offset: -44.6ppm H2O span 1.014 -> 0.9914 Offset: 0.55ppm Notes:
2011-09-15	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry tower for calibration, replaced by sn 0035.
2011-09-27	0065	LI-7500A	Calibration	Lab	Last calibration: 2011-05-24 AGC=65 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=99.28kPa, Tair=26.94C, Tdew=10.69C zero air at 1000psi, co2 in air 405.85 at 1500 Tdewspan=13.4 CO2 zero 0.8748 -> 0.8741 Offset: -2.5ppm CO2 span 0.9939 -> 0.9936 Offset: 0.05ppm H2O zero 0.6408 -> 0.6341 Offset: -44.6ppm H2O span 1.014 -> 0.9914 Offset: 0.55ppm Notes:
2012-08-16	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Mayberry permanent tower. sn 2182 was removed for calibration. The existing coefficeints and zero/span values were downloaded from the 7550 box. The new coefficients and zero/span values were uploaded to the 7550 box. The existing head sn 2182 was removed and this IRGA was installed. All looked well.
2012-12-13	0065	LI-7500A	Calibration	Lab	Last calibration: 2012-08-09 AGC= SDM= DAC1= DAC2= Ambient P=kPa, Tair=C, Tdew=C at psi, at Tdewspan= CO2 zero 0.8715 -> 0.8901 Offset: ppm CO2 span 1.0183 -> 1.0010 Offset: ppm H2O zero 0.6361 -> 0.7016 Offset: ppm H2O span 1.0392 -> 0.9935 Offset: ppm Notes: Factory calibration
2012-10-25	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Mayberry Permanent Tower due to failure. Will be returned to Licor for repair.
2012-12-13	0065	LI-7500A	Calibration	Lab	Last calibration: 2012-08-09 AGC= SDM= DAC1= DAC2= Ambient P=kPa, Tair=C, Tdew=C at psi, at Tdewspan= CO2 zero 0.8715 -> 0.8901 Offset: ppm CO2 span 1.0183 -> 1.0010 Offset: ppm H2O zero 0.6361 -> 0.7016 Offset: ppm H2O span 1.0392 -> 0.9935 Offset: ppm Notes: Factory calibration
2014-12-23	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Mayberry tower to replace sn 75H-2514 for calibration.
2015-04-20	0065	LI-7500A	Calibration	Lab	Last calibration: 2014-12-22 AGC=72.8 SDM=1 DAC1=- DAC2=- Ambient P=100.0kPa, Tair=20.13C, Tdew=12.49C Zero Air at 850psi, God CO2 421.22 at 1100 Tdewspan=15.96 CO2 zero 0.8909 -> 0.8897 Offset: -5.4ppm CO2 span 0.9835 -> 1.0074 Offset: -13.02ppm H2O zero 0.705 -> 0.7055 Offset: 4.0ppm H2O span 1.1245 -> 1.0071 Offset: 2.34ppm Notes: The internal chemicals were changes a few weeks ago - the old ones still looked good though. Relatively large offsets in span, H2O span offset similar to other 7500s calibrated at this time - dew point generator and Vaisala probe agreed with in 0.5C
2020-02-06	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry to replace sn 1594, which was brought back to the lab for calibration.
2020-08-20	0065	LI-7500A	Calibration	Lab	Last calibration: 2020-02-04 AGC=99.4 SDM= DAC1= DAC2= Ambient P=99.9kPa, Tair=28.6C, Tdew=14.7C Zero Air at 700psi, AMP CA4396 408.97 at 500 Tdewspan=20.00 CO2 zero 0.8916 -> .8917 Offset: 0.11ppm CO2 span 1.0209 -> 1.0217 Offset: -0.39ppm H2O zero 0.7291 -> 0.7297 Offset: 4.8ppm H2O span 1.0182 -> 1.0186 Offset: -0.01ppm Notes: Air quality bad inside from wildfire smoke leaking in through windows
2020-05-21	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry and brought back to the lab for calibration. Replaced by sn 0035.
2020-08-20	0065	LI-7500A	Calibration	Lab	Last calibration: 2020-02-04 AGC=99.4 SDM= DAC1= DAC2= Ambient P=99.9kPa, Tair=28.6C, Tdew=14.7C Zero Air at 700psi, AMP CA4396 408.97 at 500 Tdewspan=20.00 CO2 zero 0.8916 -> .8917 Offset: 0.11ppm CO2 span 1.0209 -> 1.0217 Offset: -0.39ppm H2O zero 0.7291 -> 0.7297 Offset: 4.8ppm H2O span 1.0182 -> 1.0186 Offset: -0.01ppm Notes: Air quality bad inside from wildfire smoke leaking in through windows
2025-01-15	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry to replace sn 75H-2182 for calibration.
2025-04-25	0065	LI-7500A	Calibration	Lab	Last calibration: 2025-01-13 AGC=98.1 SDM=7 DAC1=- DAC2=- AIU sn AIU-2652, Presure A0=59.516, A1=15.503 Ambient P=100.3kPa, Tair=15.1C, Tdew=6.9C Zero Air at 200psi, AMP FB04304 401.79 at 750 Tdewspan=13.0 CO2 zero 0.8914 -> 0.8917 Offset: 1.75ppm CO2 span 1.0226 -> 1.0266 Offset: -1.99ppm H2O zero 0.7334 -> 0.7335 Offset: 0.5ppm H2O span 1.0237 -> 1.0285 Offset: -0.09ppm Notes: Had a SS of 110 in the field - not sure why much less in the lab
2025-04-23	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry for calibration. Replaced by sn 75H-2176.
2025-04-25	0065	LI-7500A	Calibration	Lab	Last calibration: 2025-01-13 AGC=98.1 SDM=7 DAC1=- DAC2=- AIU sn AIU-2652, Presure A0=59.516, A1=15.503 Ambient P=100.3kPa, Tair=15.1C, Tdew=6.9C Zero Air at 200psi, AMP FB04304 401.79 at 750 Tdewspan=13.0 CO2 zero 0.8914 -> 0.8917 Offset: 1.75ppm CO2 span 1.0226 -> 1.0266 Offset: -1.99ppm H2O zero 0.7334 -> 0.7335 Offset: 0.5ppm H2O span 1.0237 -> 1.0285 Offset: -0.09ppm Notes: Had a SS of 110 in the field - not sure why much less in the lab
2010-10-14	0073	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed as part of the tower at the new Mayberry wet land site.
2011-02-08	0073	LI-7500A	Calibration	Lab	Calibrated in the lab 100.82kPa, 17.57C, 58% AGC, -1.18C Td Zero Air 0.0 @ 1600psi, CO2 tank 597.4ppm @ <100psi, 2.05 C Td Last cal Oct 13, 2010 CO2 zero 0.9588 -> 0.9581 offset -2.40 ppm CO2 span 0.9974 -> 0.9979 offset +0.8 ppm H2O zero 0.7319 -> 0.7303 offset -10.0 mmol/m3 H2O span 0.9821 -> 1.0362 offset +1.16 SDM address: 7, DAC 1: 0-1000, DAC 2: 10-25
2011-02-03	0073	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Mayberry tower for calibration.
2011-02-08	0073	LI-7500A	Calibration	Lab	Calibrated in the lab 100.82kPa, 17.57C, 58% AGC, -1.18C Td Zero Air 0.0 @ 1600psi, CO2 tank 597.4ppm @ <100psi, 2.05 C Td Last cal Oct 13, 2010 CO2 zero 0.9588 -> 0.9581 offset -2.40 ppm CO2 span 0.9974 -> 0.9979 offset +0.8 ppm H2O zero 0.7319 -> 0.7303 offset -10.0 mmol/m3 H2O span 0.9821 -> 1.0362 offset +1.16 SDM address: 7, DAC 1: 0-1000, DAC 2: 10-25
2020-12-09	0073	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry to replace sn 75H-2669 for calibration.
2021-03-15	0073	LI-7500A	Calibration	Lab	Last calibration: 2020-12-08 AGC=99 SDM= DAC1= DAC2= Ambient P=100.5kPa, Tair=23.7C, Tdew=1.2C Zero Air at 400psi, AMP CA3923 474.19 at 550 Tdewspan=20.00 CO2 zero 0.9564 -> .957 Offset: 1.71ppm CO2 span 1.0079 -> 1.0077 Offset: .14ppm H2O zero 0.7323 -> .7324 Offset: -1.7ppm H2O span 1.0037 -> 1.0024 Offset: .04ppm Notes: Calibrated on software v8.8.36 with 7550 firmware v8.8.32
2021-03-04	0073	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry and brought back to the lab for calibration. Replaced by sn 0418.
2021-03-15	0073	LI-7500A	Calibration	Lab	Last calibration: 2020-12-08 AGC=99 SDM= DAC1= DAC2= Ambient P=100.5kPa, Tair=23.7C, Tdew=1.2C Zero Air at 400psi, AMP CA3923 474.19 at 550 Tdewspan=20.00 CO2 zero 0.9564 -> .957 Offset: 1.71ppm CO2 span 1.0079 -> 1.0077 Offset: .14ppm H2O zero 0.7323 -> .7324 Offset: -1.7ppm H2O span 1.0037 -> 1.0024 Offset: .04ppm Notes: Calibrated on software v8.8.36 with 7550 firmware v8.8.32
2023-10-11	0073	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry to replace sn 75H-2182 for calibration.
2024-03-23	0073	LI-7500A	Calibration	Lab	Last calibration: 2023-10-05 AGC=103 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.2kPa, Tair=25.2C, Tdew=10.4C Zero Air at 325psi, AMP CA04119 524.77 at 550 Tdewspan=20.00 CO2 zero 0.9167 -> .9159 Offset: -3.14ppm CO2 span 1.0064 -> 1.0067 Offset: -4.95ppm H2O zero 0.8296 -> .8323 Offset: 15.6ppm H2O span 1.0109 -> 1.0195 Offset: -.19ppm Notes: Slightly larger CO2 span offset than usual. Painted some chips in the paint with nail polish
2024-01-04	0073	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry for calibration. Replaced by sn 0041.
2024-03-23	0073	LI-7500A	Calibration	Lab	Last calibration: 2023-10-05 AGC=103 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.2kPa, Tair=25.2C, Tdew=10.4C Zero Air at 325psi, AMP CA04119 524.77 at 550 Tdewspan=20.00 CO2 zero 0.9167 -> .9159 Offset: -3.14ppm CO2 span 1.0064 -> 1.0067 Offset: -4.95ppm H2O zero 0.8296 -> .8323 Offset: 15.6ppm H2O span 1.0109 -> 1.0195 Offset: -.19ppm Notes: Slightly larger CO2 span offset than usual. Painted some chips in the paint with nail polish
2024-07-16	0073	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry to replace sn 75H-2667 for calibration.
2024-10-29	0073	LI-7500A	Calibration	Lab	Last calibration: 2024-07-12 AGC=102.8 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.5kPa, Tair=25.4C, Tdew=6.56C Zero Air at 950psi, AMP FB04319 514.07 at 400 Tdewspan=20.00 CO2 zero 0.9156 -> .9156 Offset: -.27ppm CO2 span 1.0053 -> 1.006 Offset: -.19ppm H2O zero 0.8316 -> .8332 Offset: 9.0ppm H2O span 1.021 -> 1.0191 Offset: .04ppm Notes:
2024-10-23	0073	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry for calibration. Replaced by sn 75H-2182.
2024-10-29	0073	LI-7500A	Calibration	Lab	Last calibration: 2024-07-12 AGC=102.8 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.5kPa, Tair=25.4C, Tdew=6.56C Zero Air at 950psi, AMP FB04319 514.07 at 400 Tdewspan=20.00 CO2 zero 0.9156 -> .9156 Offset: -.27ppm CO2 span 1.0053 -> 1.006 Offset: -.19ppm H2O zero 0.8316 -> .8332 Offset: 9.0ppm H2O span 1.021 -> 1.0191 Offset: .04ppm Notes:
2017-11-30	0418	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at MB to replace sn 75H-2669.
2018-04-13	0418	LI-7500A	Calibration	Lab	Last calibration: 2017-11-27 AGC=96.6 SDM=0 DAC1=0 DAC2=0 Ambient P=101.9kPa, Tair=25.1C, Tdew=2.5C Zero Air at 100psi, LBL Air 408.97 at 1500 Tdewspan=16.00 CO2 zero 0.8998 -> .9001 Offset: 1.28ppm CO2 span 1.006 -> 1.0057 Offset: 1.14ppm H2O zero 0.8437 -> .8426 Offset: -6.1ppm H2O span 0.9821 -> .9892 Offset: -.15ppm Notes:
2018-03-19	0418	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from MB for calibration, replaced with SN 75H-2150.
2018-04-13	0418	LI-7500A	Calibration	Lab	Last calibration: 2017-11-27 AGC=96.6 SDM=0 DAC1=0 DAC2=0 Ambient P=101.9kPa, Tair=25.1C, Tdew=2.5C Zero Air at 100psi, LBL Air 408.97 at 1500 Tdewspan=16.00 CO2 zero 0.8998 -> .9001 Offset: 1.28ppm CO2 span 1.006 -> 1.0057 Offset: 1.14ppm H2O zero 0.8437 -> .8426 Offset: -6.1ppm H2O span 0.9821 -> .9892 Offset: -.15ppm Notes:
2021-03-04	0418	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry to replace sn 0073 for calibration.
2021-06-01	0418	LI-7500A	Calibration	Lab	Last calibration: 2021-03-03 AGC=100 SDM=0 DAC1=- DAC2=- Ambient P=100.5kPa, Tair=21.8C, Tdew=10.7C Zero Air at 300psi, AMP CA04119 524.77 at 1800 Tdewspan=16.0 CO2 zero 0.9003 -> 0.9004 Offset: 0.6ppm CO2 span 0.9978 -> 1.0016 Offset: -2.67ppm H2O zero 0.8461 -> 0.8444 Offset: -9.7ppm H2O span 0.9906 -> 0.9808 Offset: 0.2ppm Notes: I reset the SS from 95 to 100 before calibration.
2021-05-26	0418	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry for calibration. Replaced by sn 0042.
2021-06-01	0418	LI-7500A	Calibration	Lab	Last calibration: 2021-03-03 AGC=100 SDM=0 DAC1=- DAC2=- Ambient P=100.5kPa, Tair=21.8C, Tdew=10.7C Zero Air at 300psi, AMP CA04119 524.77 at 1800 Tdewspan=16.0 CO2 zero 0.9003 -> 0.9004 Offset: 0.6ppm CO2 span 0.9978 -> 1.0016 Offset: -2.67ppm H2O zero 0.8461 -> 0.8444 Offset: -9.7ppm H2O span 0.9906 -> 0.9808 Offset: 0.2ppm Notes: I reset the SS from 95 to 100 before calibration.
2021-10-07	0418	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry to replace sn 75H-2180 for calibration.
2022-03-08	0418	LI-7500A	Calibration	Lab	Last calibration: 2021-09-29 AGC= SDM= DAC1= DAC2= Ambient P=kPa, Tair=C, Tdew=C at psi, 750 at Tdewspan=12.00 CO2 zero 0.8995 -> .9108 Offset: ppm CO2 span 1 -> 1.0024 Offset: ppm H2O zero 0.849 -> .9116 Offset: ppm H2O span 0.9783 -> 1.0069 Offset: ppm Notes: Licor factory calibration
2021-10-21	0418	LI-7500A	Adjusted	Gas Analyzer CO2/H2O	Rest SS from 104 to 100 after cleaning
2022-03-08	0418	LI-7500A	Calibration	Lab	Last calibration: 2021-09-29 AGC= SDM= DAC1= DAC2= Ambient P=kPa, Tair=C, Tdew=C at psi, 750 at Tdewspan=12.00 CO2 zero 0.8995 -> .9108 Offset: ppm CO2 span 1 -> 1.0024 Offset: ppm H2O zero 0.849 -> .9116 Offset: ppm H2O span 0.9783 -> 1.0069 Offset: ppm Notes: Licor factory calibration
2021-12-01	0418	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry and brought back to the lab for testing. It was not giving any data for CO2, H2O or SS. Replaced by sn 1594.
2022-03-08	0418	LI-7500A	Calibration	Lab	Last calibration: 2021-09-29 AGC= SDM= DAC1= DAC2= Ambient P=kPa, Tair=C, Tdew=C at psi, 750 at Tdewspan=12.00 CO2 zero 0.8995 -> .9108 Offset: ppm CO2 span 1 -> 1.0024 Offset: ppm H2O zero 0.849 -> .9116 Offset: ppm H2O span 0.9783 -> 1.0069 Offset: ppm Notes: Licor factory calibration
2023-04-03	0418	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry to replace sn 0035 for calibration.
2023-07-19	0418	LI-7500A	Calibration	Lab	Last calibration: 2023-03-29 AGC=97.4 SDM= DAC1= DAC2= AIU sn AIU-1569, Presure A0=58.004, A1=15.479 Ambient P=100.5kPa, Tair=22.6C, Tdew=12.4C Zero Air at 1000psi, AMP CA04119 524.77 at 950 Tdewspan=16.00 CO2 zero 0.9075 -> .907 Offset: -1.98ppm CO2 span 1.0076 -> 1.0069 Offset: .51ppm H2O zero 0.9326 -> .9330 Offset: 2.4ppm H2O span 1.0052 -> 1.0049 Offset: 0.0ppm Notes: Vertical orientation, H2O span right on
2023-07-11	0418	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry for calibration. Replaced by sn 75H-2182.
2023-07-19	0418	LI-7500A	Calibration	Lab	Last calibration: 2023-03-29 AGC=97.4 SDM= DAC1= DAC2= AIU sn AIU-1569, Presure A0=58.004, A1=15.479 Ambient P=100.5kPa, Tair=22.6C, Tdew=12.4C Zero Air at 1000psi, AMP CA04119 524.77 at 950 Tdewspan=16.00 CO2 zero 0.9075 -> .907 Offset: -1.98ppm CO2 span 1.0076 -> 1.0069 Offset: .51ppm H2O zero 0.9326 -> .9330 Offset: 2.4ppm H2O span 1.0052 -> 1.0049 Offset: 0.0ppm Notes: Vertical orientation, H2O span right on
2012-01-17	1594	LI-7500A	Installed	Gas Analyzer CO2/H2O	Swapped on to the Mayberry tower. sn 0035 removed for calibration.
2012-04-24	1594	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Mayberry eddy tower. Replaced with LI-7500A sn 75H-2182
2017-01-31	1594	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry after calibration in the lab, replacing sn 75H-2176.
2017-04-27	1594	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry for calibration. Replaced by sn 75H-2180.
2018-10-04	1594	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Mayberry tower to replace sn 75H-2669 for calibration.
2019-01-18	1594	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from MB and brought back to the lab for calibration. It was replaced by sn 75H-2514.
2019-10-31	1594	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry to replace sn 0042 for calibration.
2020-02-06	1594	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry and brought back to the lab for calibration. Replaced by sn 0065.
2021-12-01	1594	LI-7500A	Installed	none	Installed at Mayberry to replace sn 0418, which was brought back to the lab for repair.
2022-03-31	1594	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry for calibration. Replaced by sn 75H-2180.
2012-10-30	75H-2150	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Mayberry Tower to replace sn 2180 for repair.
2013-07-09	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2012-10-29 AGC=94.6 SDM=2 DAC1=na DAC2=na Ambient P=100.33kPa, Tair=23.79C, Tdew=12.73C Zero Air at 1700psi, God co2 421.22 at 1600 Tdewspan=15.19 CO2 zero 0.9024 -> 0.9009 Offset: -6.67ppm CO2 span 1.0155 -> 1.0016 Offset: 7.58ppm H2O zero 0.8639 -> 0.8636 Offset: 0.5ppm H2O span 1.0153 -> 1.0091 Offset: 0.13ppm Notes: Error message said - could not save calibration - on all zero and spans, but all seemed well.
2013-02-14	75H-2150	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Mayberry tower with AIU-0614 for upgrade at Licor
2013-07-09	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2012-10-29 AGC=94.6 SDM=2 DAC1=na DAC2=na Ambient P=100.33kPa, Tair=23.79C, Tdew=12.73C Zero Air at 1700psi, God co2 421.22 at 1600 Tdewspan=15.19 CO2 zero 0.9024 -> 0.9009 Offset: -6.67ppm CO2 span 1.0155 -> 1.0016 Offset: 7.58ppm H2O zero 0.8639 -> 0.8636 Offset: 0.5ppm H2O span 1.0153 -> 1.0091 Offset: 0.13ppm Notes: Error message said - could not save calibration - on all zero and spans, but all seemed well.
2013-07-10	75H-2150	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Mayberry tower to replace sn2182 for calibration
2013-12-18	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2013-07-09 AGC=95.3 SDM=1 DAC1=- DAC2=- Ambient P=99.78kPa, Tair=22.32C, Tdew=7.8C Zero Air at 1500psi, God CO2 421.22 at 1500 Tdewspan=15.16 CO2 zero 0.9009 -> 0.9012 Offset: 1.12ppm CO2 span 1.0016 -> 1.0016 Offset: -0.05ppm H2O zero 0.8636 -> 0.8643 Offset: 5.3ppm H2O span 1.0091 -> 0.9987 Offset: 0.25ppm Notes:
2013-12-06	75H-2150	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Mayberry Tower for calibration. Replaced by sn 75H-2180
2013-12-18	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2013-07-09 AGC=95.3 SDM=1 DAC1=- DAC2=- Ambient P=99.78kPa, Tair=22.32C, Tdew=7.8C Zero Air at 1500psi, God CO2 421.22 at 1500 Tdewspan=15.16 CO2 zero 0.9009 -> 0.9012 Offset: 1.12ppm CO2 span 1.0016 -> 1.0016 Offset: -0.05ppm H2O zero 0.8636 -> 0.8643 Offset: 5.3ppm H2O span 1.0091 -> 0.9987 Offset: 0.25ppm Notes:
2015-12-28	75H-2150	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Mayberry Tower to replace sn 75H-2514 for calibration.
2016-05-13	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2015-12-07 AGC=97.6 SDM=- DAC1=- DAC2=- Ambient P=100.15kPa, Tair=20.52C, Tdew=8.5C Zero Air at 600psi, God CO2 421.22 at 500 Tdewspan=15.09 CO2 zero 0.9019 -> 0.9020 Offset: 0.40ppm CO2 span 1.0114 -> 1.0080 Offset: 1.84ppm H2O zero 0.8671 -> 0.8668 Offset: -2.4ppm H2O span 1.0258 -> 1.0109 Offset: 0.31ppm Notes: Calibration from H2O performed at 15.09C dew point instead of 11.09 which has been used previously. Use 15.09 from now on for a larger calibrated H2O range.
2016-04-13	75H-2150	LI-7500A	Removed	Gas Analyzer CO2/H2O	Taken down from Mayberry system for calibration and replaced with sn 75H-2182
2016-05-13	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2015-12-07 AGC=97.6 SDM=- DAC1=- DAC2=- Ambient P=100.15kPa, Tair=20.52C, Tdew=8.5C Zero Air at 600psi, God CO2 421.22 at 500 Tdewspan=15.09 CO2 zero 0.9019 -> 0.9020 Offset: 0.40ppm CO2 span 1.0114 -> 1.0080 Offset: 1.84ppm H2O zero 0.8671 -> 0.8668 Offset: -2.4ppm H2O span 1.0258 -> 1.0109 Offset: 0.31ppm Notes: Calibration from H2O performed at 15.09C dew point instead of 11.09 which has been used previously. Use 15.09 from now on for a larger calibrated H2O range.
2018-03-19	75H-2150	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at MB replacing SN 0418 for calibration.
2018-07-10	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2018-03-05 AGC=97 SDM= DAC1= DAC2= Ambient P=100.5kPa, Tair=27.2C, Tdew=12.7C Zero Air at 150psi, LBL Air 408.97 at 1300 Tdewspan=16.00 CO2 zero 0.9023 -> .9017 Offset: -2.64ppm CO2 span 1.0093 -> 1.002 Offset: 3.79ppm H2O zero 0.9655 -> .8662 Offset: 5.1ppm H2O span 1.0096 -> 1.0069 Offset: .06ppm Notes:
2018-06-28	75H-2150	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from MB and brought back to the lab for calibration. It was replaced by 75H-2669.
2018-07-10	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2018-03-05 AGC=97 SDM= DAC1= DAC2= Ambient P=100.5kPa, Tair=27.2C, Tdew=12.7C Zero Air at 150psi, LBL Air 408.97 at 1300 Tdewspan=16.00 CO2 zero 0.9023 -> .9017 Offset: -2.64ppm CO2 span 1.0093 -> 1.002 Offset: 3.79ppm H2O zero 0.9655 -> .8662 Offset: 5.1ppm H2O span 1.0096 -> 1.0069 Offset: .06ppm Notes:
2014-03-19	75H-2176	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Mayberry tower to replace sn 75H-2180 for calibration.
2014-09-23	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2014-03-17 AGC=88.9 SDM=1 DAC1=- DAC2=- Ambient P=100.22kPa, Tair=26.52C, Tdew=16.19C Zero Air at 1050psi, God CO2 421.22 at 1350 Tdewspan=15.80 CO2 zero 0.8687 -> 0.8685 Offset: -0.73ppm CO2 span 1.0113 -> 1.0145 Offset: -1.74ppm H2O zero 0.8531 -> 0.8547 Offset: 8.8ppm H2O span 0.9904 -> 1.0075 Offset: -0.37ppm Notes:
2014-04-28	75H-2176	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the permanent Mayberry tower and installed on the portable tower. Replaced by Ameriflux sn 75H-2339
2014-09-23	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2014-03-17 AGC=88.9 SDM=1 DAC1=- DAC2=- Ambient P=100.22kPa, Tair=26.52C, Tdew=16.19C Zero Air at 1050psi, God CO2 421.22 at 1350 Tdewspan=15.80 CO2 zero 0.8687 -> 0.8685 Offset: -0.73ppm CO2 span 1.0113 -> 1.0145 Offset: -1.74ppm H2O zero 0.8531 -> 0.8547 Offset: 8.8ppm H2O span 0.9904 -> 1.0075 Offset: -0.37ppm Notes:
2014-04-28	75H-2176	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Mayberry Portable tower with LI-7700 sn TG1-0224 and LI-7550 sn AIU-0397. This tower is mounted in the back of Dennis's truck and will be moved between two locations on a roughly weekly basis.
2014-09-23	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2014-03-17 AGC=88.9 SDM=1 DAC1=- DAC2=- Ambient P=100.22kPa, Tair=26.52C, Tdew=16.19C Zero Air at 1050psi, God CO2 421.22 at 1350 Tdewspan=15.80 CO2 zero 0.8687 -> 0.8685 Offset: -0.73ppm CO2 span 1.0113 -> 1.0145 Offset: -1.74ppm H2O zero 0.8531 -> 0.8547 Offset: 8.8ppm H2O span 0.9904 -> 1.0075 Offset: -0.37ppm Notes:
2015-01-15	75H-2176	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Mayberry tower and replaced by sn 75H-2514. The was the wrong head for the box and was brought in for thorough forensics.
2015-05-05	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2015-05-05 AGC=90.7 SDM=1 DAC1=- DAC2=- Ambient P=100.12kPa, Tair=14.62C, Tdew=8.08C Zero Air at 850psi, God CO2 421.22 at 1100 Tdewspan=11.08 CO2 zero 0.8691 -> 0.8692 Offset: .38ppm CO2 span 1.0215 -> 1.0216 Offset: 0.0ppm H2O zero 0.8559 -> 0.8562 Offset: 1.7ppm H2O span 1.0099 -> 1.0239 Offset: -0.27ppm Notes:
2016-10-26	75H-2176	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry tower after lab calibration to replace 75H-2669
2017-03-07	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2016-10-25 AGC=91.5 SDM=-- DAC1=-- DAC2=-- Ambient P=101.1kPa, Tair=21.5C, Tdew=--C Zero Air at 1700psi, God Air 421.22 at 375 Tdewspan=16.01 CO2 zero 0.8689 -> 0.8691 Offset: 0.83ppm CO2 span 1.0176 -> 1.0195 Offset: -1.04ppm H2O zero 0.8563 -> 0.8561 Offset: -0.7ppm H2O span 1.0134 -> 1.0102 Offset: -0.04ppm Notes:
2017-01-31	75H-2176	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry for calibration in the lab. Replaced by sn 1594
2017-03-07	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2016-10-25 AGC=91.5 SDM=-- DAC1=-- DAC2=-- Ambient P=101.1kPa, Tair=21.5C, Tdew=--C Zero Air at 1700psi, God Air 421.22 at 375 Tdewspan=16.01 CO2 zero 0.8689 -> 0.8691 Offset: 0.83ppm CO2 span 1.0176 -> 1.0195 Offset: -1.04ppm H2O zero 0.8563 -> 0.8561 Offset: -0.7ppm H2O span 1.0134 -> 1.0102 Offset: -0.04ppm Notes:
2025-04-23	75H-2176	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry to replace sn 0065 for calibration.
2012-10-25	75H-2180	LI-7500A	Installed	Gas Analyzer CO2/H2O	Removed from the Mayberry Portable tower and installed on the permanent tower to replace sn 0065 that had failed.
2012-12-12	75H-2180	LI-7500A	Calibration	Factory	Last calibration: AGC= SDM= DAC1= DAC2= Ambient P=kPa, Tair=C, Tdew=C at psi, 744 at Tdewspan=12 CO2 zero -> 0.9145 Offset: ppm CO2 span -> 1.0090 Offset: ppm H2O zero -> 0.8788 Offset: ppm H2O span -> 0.9989 Offset: ppm Notes: Factory calibration with upgrade of firmware and external connector board
2012-10-30	75H-2180	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Mayberry Tower due to damaged caused by corrosion in the 7550 box. replaced by sn 2150
2012-12-12	75H-2180	LI-7500A	Calibration	Factory	Last calibration: AGC= SDM= DAC1= DAC2= Ambient P=kPa, Tair=C, Tdew=C at psi, 744 at Tdewspan=12 CO2 zero -> 0.9145 Offset: ppm CO2 span -> 1.0090 Offset: ppm H2O zero -> 0.8788 Offset: ppm H2O span -> 0.9989 Offset: ppm Notes: Factory calibration with upgrade of firmware and external connector board
2013-12-06	75H-2180	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Mayberry tower to replace sn 2150 for calibration
2014-03-26	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2013-11-20 AGC=94.2 SDM=1 DAC1=- DAC2=- Ambient P=99.1kPa, Tair=19.10C, Tdew=11.27C Zero Air at 1450psi, God CO2 421.22 at 1500 Tdewspan=15.26 CO2 zero 0.9148 -> 0.9147 Offset: -0.55ppm CO2 span 1.0156 -> 1.0173 Offset: -0.84ppm H2O zero 0.8791 -> 0.8803 Offset: 7.8ppm H2O span 1.0019 -> 0.9946 Offset: 0.15ppm Notes: Calibrated by Joe
2014-03-19	75H-2180	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Mayberry tower for calibration. Replaced by sn 75H-2176.
2014-03-26	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2013-11-20 AGC=94.2 SDM=1 DAC1=- DAC2=- Ambient P=99.1kPa, Tair=19.10C, Tdew=11.27C Zero Air at 1450psi, God CO2 421.22 at 1500 Tdewspan=15.26 CO2 zero 0.9148 -> 0.9147 Offset: -0.55ppm CO2 span 1.0156 -> 1.0173 Offset: -0.84ppm H2O zero 0.8791 -> 0.8803 Offset: 7.8ppm H2O span 1.0019 -> 0.9946 Offset: 0.15ppm Notes: Calibrated by Joe
2015-04-23	75H-2180	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Mayberry tower to replace sn 75H-2514 for calibration.
2015-08-25	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2015-04-20 AGC=98.3 SDM=6 DAC1=- DAC2=- Ambient P=100.25kPa, Tair=18.56C, Tdew=14.50C Zero Air at 700psi, God CO2 421.22 at 800 Tdewspan=11.08 CO2 zero 0.9146 -> 0.9145 Offset: -0.46ppm CO2 span 1.0232 -> 1.0275 Offset: -2.18ppm H2O zero 0.8819 -> 0.8865 Offset: 29.4ppm H2O span 1.0154 -> 1.0123 Offset: 0.06ppm Notes:
2015-08-19	75H-2180	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Mayberry Tower for calibration. Replaced by sn 75H-2514
2015-08-25	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2015-04-20 AGC=98.3 SDM=6 DAC1=- DAC2=- Ambient P=100.25kPa, Tair=18.56C, Tdew=14.50C Zero Air at 700psi, God CO2 421.22 at 800 Tdewspan=11.08 CO2 zero 0.9146 -> 0.9145 Offset: -0.46ppm CO2 span 1.0232 -> 1.0275 Offset: -2.18ppm H2O zero 0.8819 -> 0.8865 Offset: 29.4ppm H2O span 1.0154 -> 1.0123 Offset: 0.06ppm Notes:
2017-04-27	75H-2180	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on Mayberry to replace sn 1594 for calibration.
2017-08-16	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2017-04-20 AGC=100.3 SDM= DAC1= DAC2= Ambient P=100.4kPa, Tair=23.1C, Tdew=13.9C Zero Air at 1075psi, AMP Air 408.97 at 2000 Tdewspan=16.00 CO2 zero 0.9144 -> .9129 Offset: -6.82ppm CO2 span 1.026 -> 1.0145 Offset: 5.95ppm H2O zero 0.8861 -> .8871 Offset: 6.2ppm H2O span 1.023 -> 1.0164 Offset: .14ppm Notes:
2017-08-16	75H-2180	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from MB for calibration and replaced with sn 75H-2669
2018-01-10	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2017-08-16 AGC=97.8 SDM=0 DAC1=0 DAC2=0 Ambient P=101.1kPa, Tair=17.4C, Tdew=10.6C Zero Air at 250psi, LBL Air 408.97 at 1700 Tdewspan=16.00 CO2 zero 0.9129 -> 0.9147 Offset: 7.92ppm CO2 span 1.0145 -> 1.0362 Offset: -10.74ppm H2O zero 0.8871 -> 0.8864 Offset: -4.2ppm H2O span 1.0164 -> 1.0168 Offset: -0.02ppm Notes:
2021-06-16	75H-2180	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry to replace sn 0042 due to bad pressure reading.
2021-11-30	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2021-06-15 AGC=102.0 SDM=0 DAC1=- DAC2=- Ambient P=100.9kPa, Tair=27.0C, Tdew=12.3C Zero Air at 1400psi, AMP CA04119 524.77 at 1700 Tdewspan=20.0 CO2 zero 0.9138 -> 0.9136 Offset: -0.8ppm CO2 span 1.0281 -> 1.0295 Offset: -0.76ppm H2O zero 0.8901 -> 0.8924 Offset: 14.5ppm H2O span 1.0164 -> 1.0346 Offset: -0.39ppm Notes: Had to use config file from 2021-03-08 and enter latest zero and span values by hand. Had to add water to dew point generator.
2021-10-07	75H-2180	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry for calibration. Replaced by sn 0418.
2021-11-30	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2021-06-15 AGC=102.0 SDM=0 DAC1=- DAC2=- Ambient P=100.9kPa, Tair=27.0C, Tdew=12.3C Zero Air at 1400psi, AMP CA04119 524.77 at 1700 Tdewspan=20.0 CO2 zero 0.9138 -> 0.9136 Offset: -0.8ppm CO2 span 1.0281 -> 1.0295 Offset: -0.76ppm H2O zero 0.8901 -> 0.8924 Offset: 14.5ppm H2O span 1.0164 -> 1.0346 Offset: -0.39ppm Notes: Had to use config file from 2021-03-08 and enter latest zero and span values by hand. Had to add water to dew point generator.
2022-03-31	75H-2180	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry to replace sn 1594 for calibration.
2022-08-30	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2022-03-30 AGC=100.2 SDM= DAC1= DAC2= Ambient P=100.5kPa, Tair=24.8C, Tdew=14.4C Zero Air at 275psi, AMP CA04119 524.77 at 1400 Tdewspan=20.00 CO2 zero 0.9141 -> 0.9148 Offset: 3.30ppm CO2 span 1.0373 -> 1.0318 Offset: 3.89ppm H2O zero 0.8911 -> .8916 Offset: 3.3ppm H2O span 1.0345 -> 1.0122 Offset: .49ppm Notes: The initial H2O Span at 20.00 made the sensor jump to 20.02, but another span a few minutes later was right on 20.00. Should be ok.
2022-08-30	75H-2180	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from MB and brought back to the lab for calibration. It was replaced by sn 75H-2514.
2022-12-05	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2022-08-30 AGC=101.0 SDM=0 DAC1=- DAC2=- Ambient P=100.6kPa, Tair=21.3C, Tdew=9.2C Zero Air at 1700psi, AMP CA04119 524.77 at 1300 Tdewspan=16.0 CO2 zero 0.9148 -> 0.9145 Offset: -1.53ppm CO2 span 1.0318 -> 1.0433 Offset: -7.27ppm H2O zero 0.8916 -> 0.8933 Offset: 10.7ppm H2O span 1.0122 -> 1.0381 Offset: -0.53ppm Notes: Large offset in CO2 span but also large offset when removed from tower and similar offset in sn 2176 CO2 span calibrated at the same time. Used our 7550 box 0674 instead on the AMP loaner used previously. I think this IRGA is okay.
2012-04-24	75H-2182	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Mayberry eddy tower to swap out LI-7500 sn 1594
2012-08-21	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2012-01-27 AGC=43.8 SDM=10 DAC1= DAC2= Ambient P=100.92kPa, Tair=23.95C, Tdew=13.18C Zero air at 1800psi, CO2 in air 436.53 at 400 Tdewspan=15.08 CO2 zero 0.8832 -> 0.8838 Offset: 2.62ppm CO2 span 1.0039 -> 1.0277 Offset: -12.88ppm H2O zero 0.8329 -> 0.8371 Offset: 27.9ppm H2O span 0.9992 -> 0.9989 Offset: 0.06ppm Notes: First lab calibration since receiving this instrument.
2012-08-16	75H-2182	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Mayberry permanent tower for calibration. Replaced by sn 0065 that was recently upgraded to a 7500A interface.
2012-08-21	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2012-01-27 AGC=43.8 SDM=10 DAC1= DAC2= Ambient P=100.92kPa, Tair=23.95C, Tdew=13.18C Zero air at 1800psi, CO2 in air 436.53 at 400 Tdewspan=15.08 CO2 zero 0.8832 -> 0.8838 Offset: 2.62ppm CO2 span 1.0039 -> 1.0277 Offset: -12.88ppm H2O zero 0.8329 -> 0.8371 Offset: 27.9ppm H2O span 0.9992 -> 0.9989 Offset: 0.06ppm Notes: First lab calibration since receiving this instrument.
2013-02-14	75H-2182	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed to replace sn 2150 for upgrade at Licor
2013-08-20	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2013-05-02 AGC=83.9 SDM=1 DAC1=na DAC2=na Ambient P=100.10kPa, Tair=23.58C, Tdew=15.58C Zero Air at 1700psi, God CO2 421.22 at 1600 Tdewspan=15.19 CO2 zero 0.8837 -> 0.8802 Offset: -16.20ppm CO2 span 1.0037 -> 0.9947 Offset: 3.47ppm H2O zero 0.8417 -> 0.8471 Offset: 34.9ppm H2O span 0.9978 -> 0.9854 Offset: 0.27ppm Notes: Last cal was don at the factory after upgrade. Large zero offsets.
2013-07-10	75H-2182	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the tower for calibration. Replaced by sn2150
2013-08-20	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2013-05-02 AGC=83.9 SDM=1 DAC1=na DAC2=na Ambient P=100.10kPa, Tair=23.58C, Tdew=15.58C Zero Air at 1700psi, God CO2 421.22 at 1600 Tdewspan=15.19 CO2 zero 0.8837 -> 0.8802 Offset: -16.20ppm CO2 span 1.0037 -> 0.9947 Offset: 3.47ppm H2O zero 0.8417 -> 0.8471 Offset: 34.9ppm H2O span 0.9978 -> 0.9854 Offset: 0.27ppm Notes: Last cal was don at the factory after upgrade. Large zero offsets.
2016-04-13	75H-2182	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry tower to replace sn 75H-2150
2016-08-30	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2016-04-11 AGC=87.48 SDM=6 DAC1=- DAC2=- Ambient P=100.13kPa, Tair=22.36C, Tdew=13.81C Zero Air at 400psi, God CO2 421.22 at 450 Tdewspan=16.0 CO2 zero 0.8832 -> 0.8831 Offset: -0.53ppm CO2 span 1.0198 -> 1.0142 Offset: 2.98ppm H2O zero 0.8466 -> 0.8464 Offset: -0.9ppm H2O span 1.0138 -> 1.0230 Offset: -0.19ppm Notes: Bandwidth setting changed from 5Hz to 10Hz
2016-07-20	75H-2182	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Mayberry tower for calibration. Replaced by sn 75H-2669
2016-08-30	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2016-04-11 AGC=87.48 SDM=6 DAC1=- DAC2=- Ambient P=100.13kPa, Tair=22.36C, Tdew=13.81C Zero Air at 400psi, God CO2 421.22 at 450 Tdewspan=16.0 CO2 zero 0.8832 -> 0.8831 Offset: -0.53ppm CO2 span 1.0198 -> 1.0142 Offset: 2.98ppm H2O zero 0.8466 -> 0.8464 Offset: -0.9ppm H2O span 1.0138 -> 1.0230 Offset: -0.19ppm Notes: Bandwidth setting changed from 5Hz to 10Hz
2019-04-18	75H-2182	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at MB to replace sn 75H-2514, which was brought back to the lab for calibration.
2019-08-01	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2019-04-15 AGC=87.5 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=23.9C, Tdew=13.6C Zero Air at 975psi, AMP CA4396 408.97 at 800 Tdewspan=20.00 CO2 zero 0.8842 -> .8846 Offset: 1.90ppm CO2 span 1.0156 -> 1.0226 Offset: 3.54ppm H2O zero 0.8459 -> .8456 Offset: -1.6ppm H2O span 1.0189 -> 1.0214 Offset: -.05ppm Notes: When SS was 87.5, I reset it to 100. I uploaded the the calibration file from 2018-10-24 and copied in the manual coefficients for CO2 span, CO2 zero, H2O span, and H2O zero from the database's record of the most recent calibration on 2019-04-15.
2019-07-25	75H-2182	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from MB and brought back to the lab for calibration. It was replaced by sn 0042.
2019-08-01	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2019-04-15 AGC=87.5 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=23.9C, Tdew=13.6C Zero Air at 975psi, AMP CA4396 408.97 at 800 Tdewspan=20.00 CO2 zero 0.8842 -> .8846 Offset: 1.90ppm CO2 span 1.0156 -> 1.0226 Offset: 3.54ppm H2O zero 0.8459 -> .8456 Offset: -1.6ppm H2O span 1.0189 -> 1.0214 Offset: -.05ppm Notes: When SS was 87.5, I reset it to 100. I uploaded the the calibration file from 2018-10-24 and copied in the manual coefficients for CO2 span, CO2 zero, H2O span, and H2O zero from the database's record of the most recent calibration on 2019-04-15.
2023-07-11	75H-2182	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry to replace sn 0418 for calibration.
2023-10-23	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2023-07-10 AGC=99.8 SDM= DAC1= DAC2= AIU sn AIU-1569, Presure A0=58.004, A1=15.479 Ambient P=100.1kPa, Tair=25.2C, Tdew=15.7C Zero Air at 700psi, AMP CA04119 524.77 at 775 Tdewspan=20.00 CO2 zero 0.8856 -> .8848 Offset: -4.04ppm CO2 span 1.0165 -> 1.0124 Offset: 2.9ppm H2O zero 0.8294 -> .8311 Offset: 10.9ppm H2O span 1.0313 -> 1.0325 Offset: -.03ppm Notes: Vertical orientation. Before calibration, cleaned dusty spars and lots of bird poop on body.
2023-10-11	75H-2182	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry for calibration. Replaced by sn 0073.
2023-10-23	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2023-07-10 AGC=99.8 SDM= DAC1= DAC2= AIU sn AIU-1569, Presure A0=58.004, A1=15.479 Ambient P=100.1kPa, Tair=25.2C, Tdew=15.7C Zero Air at 700psi, AMP CA04119 524.77 at 775 Tdewspan=20.00 CO2 zero 0.8856 -> .8848 Offset: -4.04ppm CO2 span 1.0165 -> 1.0124 Offset: 2.9ppm H2O zero 0.8294 -> .8311 Offset: 10.9ppm H2O span 1.0313 -> 1.0325 Offset: -.03ppm Notes: Vertical orientation. Before calibration, cleaned dusty spars and lots of bird poop on body.
2024-10-23	75H-2182	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry to replace sn 0073 for calibration.
2025-01-28	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2024-10-22 AGC=100.7 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.9kPa, Tair=23.4C, Tdew=6.75C Zero Air at 775psi, AMP FB04319 514.07 at 275 Tdewspan=16.00 CO2 zero 0.8849 -> .8846 Offset: -1.47ppm CO2 span 1.0136 -> 1.0164 Offset: -1.92ppm H2O zero 0.8326 -> .8352 Offset: 16.9ppm H2O span 1.0334 -> 1.0136 Offset: -.01ppm Notes: Software span point of 514.07 --> CO2 reading of 514.12 Software span point of 514.02 --> CO2 reading of 514.07
2025-01-15	75H-2182	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry for calibration. Replaced by sn 0065.
2025-01-28	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2024-10-22 AGC=100.7 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.9kPa, Tair=23.4C, Tdew=6.75C Zero Air at 775psi, AMP FB04319 514.07 at 275 Tdewspan=16.00 CO2 zero 0.8849 -> .8846 Offset: -1.47ppm CO2 span 1.0136 -> 1.0164 Offset: -1.92ppm H2O zero 0.8326 -> .8352 Offset: 16.9ppm H2O span 1.0334 -> 1.0136 Offset: -.01ppm Notes: Software span point of 514.07 --> CO2 reading of 514.12 Software span point of 514.02 --> CO2 reading of 514.07
2014-04-28	75H-2339	LI-7500A	Installed	Gas Analyzer CO2/H2O	This is a borrowed sensor. It was installed on the Mayberry permanent tower to replace sn 75H-2176 for use on the portable tower.
2014-08-19	75H-2339	LI-7500A	Removed	Gas Analyzer CO2/H2O	This is part of the emergency response GHG system borrowed from Ameriflux. Removed from the Mayberry Tower with 7700 sn TG1-0352 and 7550 sn AIU-0915 and returned to Stephen at LBNL Ameriflux.
2014-08-19	75H-2514	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Mayberry tower with 7700 sn TG1-0224 and 7550 sn AIU-1285 to replace the Ameriflux emergency response GHG system.
2015-01-06	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2014-08-05 AGC=102.1 SDM=1 DAC1=- DAC2=- Ambient P=101.32kPa, Tair=21.41C, Tdew=6.57C Zero Air at 950psi, God CO2 421.22 at 1300 Tdewspan=15.95 CO2 zero 0.9049 -> 0.9059 Offset: 2.47ppm CO2 span 1.0031 -> 1.0120 Offset: -4.7ppm H2O zero 0.8326 -> 0.8361 Offset: 24.9ppm H2O span 1.0000 -> 1.0221 Offset: -0.46ppm Notes: Last calibration was in initial Factory cal. Slightly larger than usual offset might be the difference in calibration equipment.
2014-12-23	75H-2514	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Mayberry Tower for calibration. Replaced by sn 0065.
2015-01-06	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2014-08-05 AGC=102.1 SDM=1 DAC1=- DAC2=- Ambient P=101.32kPa, Tair=21.41C, Tdew=6.57C Zero Air at 950psi, God CO2 421.22 at 1300 Tdewspan=15.95 CO2 zero 0.9049 -> 0.9059 Offset: 2.47ppm CO2 span 1.0031 -> 1.0120 Offset: -4.7ppm H2O zero 0.8326 -> 0.8361 Offset: 24.9ppm H2O span 1.0000 -> 1.0221 Offset: -0.46ppm Notes: Last calibration was in initial Factory cal. Slightly larger than usual offset might be the difference in calibration equipment.
2015-01-15	75H-2514	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Mayberry tower to replace sn 75H-2176. The existing head had a mismatched box.
2015-05-05	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2015-01-13 AGC=103.4 SDM=1 DAC1=- DAC2=- Ambient P=100.13kPa, Tair=18.11C, Tdew=8.78C Zero Air at 850psi, God CO2 421.22 at 1100 Tdewspan=11.08 CO2 zero 0.9055 -> 0.9058 Offset: 1.02ppm CO2 span 1.0079 -> 1.0120 Offset: -2.25ppm H2O zero 0.8334 -> 0.8355 Offset: 15.2ppm H2O span 1.0067 -> 1.0238 Offset: -0.33ppm Notes:
2015-04-23	75H-2514	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Mayberry tower for calibration. It was replaced by sn 75H-2180.
2015-05-05	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2015-01-13 AGC=103.4 SDM=1 DAC1=- DAC2=- Ambient P=100.13kPa, Tair=18.11C, Tdew=8.78C Zero Air at 850psi, God CO2 421.22 at 1100 Tdewspan=11.08 CO2 zero 0.9055 -> 0.9058 Offset: 1.02ppm CO2 span 1.0079 -> 1.0120 Offset: -2.25ppm H2O zero 0.8334 -> 0.8355 Offset: 15.2ppm H2O span 1.0067 -> 1.0238 Offset: -0.33ppm Notes:
2015-08-19	75H-2514	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Mayberry Tower to replace sn 75H-2180 for calibration
2016-02-09	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2015-08-18 AGC=102.19 SDM=6 DAC1=- DAC2=- Ambient P=100.57kPa, Tair=27.18C, Tdew=9.94C Zero Air at 700psi, God CO2 421.22 at 700 Tdewspan=11.08 CO2 zero 0.9053 -> 0.9050 Offset: -1.23ppm CO2 span 1.0154 -> 1.0028 Offset: 2.22ppm H2O zero 0.837 -> 0.8364 Offset: -4.4ppm H2O span 1.0154 -> 1.0226 Offset: -0.13ppm Notes:
2015-12-28	75H-2514	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Mayberry tower for calibration. Replaced by sn 75H-2150
2016-02-09	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2015-08-18 AGC=102.19 SDM=6 DAC1=- DAC2=- Ambient P=100.57kPa, Tair=27.18C, Tdew=9.94C Zero Air at 700psi, God CO2 421.22 at 700 Tdewspan=11.08 CO2 zero 0.9053 -> 0.9050 Offset: -1.23ppm CO2 span 1.0154 -> 1.0028 Offset: 2.22ppm H2O zero 0.837 -> 0.8364 Offset: -4.4ppm H2O span 1.0154 -> 1.0226 Offset: -0.13ppm Notes:
2019-01-18	75H-2514	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at MB to replace sn 1594, which was brought back to the lab for calibration.
2019-04-22	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2019-01-07 AGC=102 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=24.7C, Tdew=10.9C Zero Air at 1100psi, AMP Air 408.97 at 700 Tdewspan=16.00 CO2 zero 0.9051 -> .905 Offset: -.69ppm CO2 span 1.0167 -> 1.01 Offset: 3.39ppm H2O zero 0.8397 -> .8389 Offset: -5.5ppm H2O span 1.0177 -> 1.0155 Offset: .05ppm Notes:
2019-04-18	75H-2514	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from MB and brought back to the lab for calibration. It was replaced by sn 75H-2182.
2019-04-22	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2019-01-07 AGC=102 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=24.7C, Tdew=10.9C Zero Air at 1100psi, AMP Air 408.97 at 700 Tdewspan=16.00 CO2 zero 0.9051 -> .905 Offset: -.69ppm CO2 span 1.0167 -> 1.01 Offset: 3.39ppm H2O zero 0.8397 -> .8389 Offset: -5.5ppm H2O span 1.0177 -> 1.0155 Offset: .05ppm Notes:
2022-08-30	75H-2514	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry to replace sn 75H-2180 for calibration.
2023-03-14	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2022-03-17 AGC=101.4 SDM=0 DAC1=- DAC2=- Ambient P=99.2kPa, Tair=19.7C, Tdew=12.3C Zero Air at 1400psi, AMP CA04119 524.77 at 1250 Tdewspan=16.0 CO2 zero 0.905 -> 0.9053 Offset: 1.4ppm CO2 span 1.0125 -> 1.0169 Offset: -3.02ppm H2O zero 0.8403 -> 0.8408 Offset: 3.4ppm H2O span 1.0196 -> 1.0243 Offset: -0.9ppm Notes: Using AMP loaner AIU-2312
2023-01-18	75H-2514	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry for calibration. Replaced by sn 0035.
2023-03-14	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2022-03-17 AGC=101.4 SDM=0 DAC1=- DAC2=- Ambient P=99.2kPa, Tair=19.7C, Tdew=12.3C Zero Air at 1400psi, AMP CA04119 524.77 at 1250 Tdewspan=16.0 CO2 zero 0.905 -> 0.9053 Offset: 1.4ppm CO2 span 1.0125 -> 1.0169 Offset: -3.02ppm H2O zero 0.8403 -> 0.8408 Offset: 3.4ppm H2O span 1.0196 -> 1.0243 Offset: -0.9ppm Notes: Using AMP loaner AIU-2312
2024-04-11	75H-2667	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry to replace sn 0041 for calibration.
2024-07-19	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2024-04-10 AGC=99.0 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.38kPa, Tair=24.31C, Tdew=14.4C Zero Air at 1700psi, AMP CA04119 524.77 at 350 Tdewspan=20.00 CO2 zero 0.9409 -> .9416 Offset: 2.77ppm CO2 span 1.0213 -> 1.0177 Offset: 2.39ppm H2O zero 0.8441 -> .8407 Offset: -20.2ppm H2O span 1.0404 -> 1.0371 Offset: .06ppm Notes: Used "524.67" as CO2 span point and "19.99" as H2O span point in 7550 software. Larger H2O zero offset (-20.2 mmol/m3) than usual.
2024-07-16	75H-2667	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry for calibration. Replaced by sn 0073.
2024-07-19	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2024-04-10 AGC=99.0 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.38kPa, Tair=24.31C, Tdew=14.4C Zero Air at 1700psi, AMP CA04119 524.77 at 350 Tdewspan=20.00 CO2 zero 0.9409 -> .9416 Offset: 2.77ppm CO2 span 1.0213 -> 1.0177 Offset: 2.39ppm H2O zero 0.8441 -> .8407 Offset: -20.2ppm H2O span 1.0404 -> 1.0371 Offset: .06ppm Notes: Used "524.67" as CO2 span point and "19.99" as H2O span point in 7550 software. Larger H2O zero offset (-20.2 mmol/m3) than usual.
2016-07-20	75H-2669	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Mayberry tower to replace sn 75H-2182 for calibration
2016-12-19	75H-2669	LI-7500A	Calibration	Lab	Last calibration: 2016-07-19 AGC=104.5 SDM=6 DAC1=- DAC2=- Ambient P=101.24kPa, Tair=21.21C, Tdew=0.0C Zero Air at 300psi, God CO2 421.22 at 400 Tdewspan=16.00 CO2 zero 0.919 -> 0.9184 Offset: -2.14ppm CO2 span 1.0141 -> 1.0119 Offset: 1.13ppm H2O zero 0.9987 -> 0.8989 Offset: 25.1ppm H2O span 1.0143 -> 1.0109 Offset: 0.07ppm Notes:
2016-10-26	75H-2669	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry tower for calibration. Replaced by 75H-2176
2016-12-19	75H-2669	LI-7500A	Calibration	Lab	Last calibration: 2016-07-19 AGC=104.5 SDM=6 DAC1=- DAC2=- Ambient P=101.24kPa, Tair=21.21C, Tdew=0.0C Zero Air at 300psi, God CO2 421.22 at 400 Tdewspan=16.00 CO2 zero 0.919 -> 0.9184 Offset: -2.14ppm CO2 span 1.0141 -> 1.0119 Offset: 1.13ppm H2O zero 0.9987 -> 0.8989 Offset: 25.1ppm H2O span 1.0143 -> 1.0109 Offset: 0.07ppm Notes:
2017-08-16	75H-2669	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at MB to replace sn 75H-2180.
2017-12-15	75H-2669	LI-7500A	Calibration	Lab	Last calibration: 2017-08-14 AGC=103.3 SDM=0 DAC1=0 DAC2=0 Ambient P=100.7kPa, Tair=22.2C, Tdew=7C Zero Air at 250psi, LBL Air 408.97 at 1700 Tdewspan=16.00 CO2 zero 0.9187 -> .9187 Offset: .39ppm CO2 span 1.0144 -> 1.0157 Offset: -.73ppm H2O zero 0.8988 -> .8988 Offset: .2ppm H2O span 1.0091 -> 1.0033 Offset: .12ppm Notes:
2017-11-30	75H-2669	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from MB and brought back to the lab for calibration.
2017-12-15	75H-2669	LI-7500A	Calibration	Lab	Last calibration: 2017-08-14 AGC=103.3 SDM=0 DAC1=0 DAC2=0 Ambient P=100.7kPa, Tair=22.2C, Tdew=7C Zero Air at 250psi, LBL Air 408.97 at 1700 Tdewspan=16.00 CO2 zero 0.9187 -> .9187 Offset: .39ppm CO2 span 1.0144 -> 1.0157 Offset: -.73ppm H2O zero 0.8988 -> .8988 Offset: .2ppm H2O span 1.0091 -> 1.0033 Offset: .12ppm Notes:
2018-06-28	75H-2669	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at MB to replace sn 75H-2150, which was brought back to the lab for calibration.
2018-10-09	75H-2669	LI-7500A	Calibration	Lab	Last calibration: 2018-06-25 AGC=103 SDM=0 DAC1=0 DAC2=0 Ambient P=99.88kPa, Tair=27.1C, Tdew=12.9C Zero Air at 1425psi, AMP Air 408.97 at 1200 Tdewspan=16.00 CO2 zero 0.9182 -> .9180 Offset: -.8ppm CO2 span 1.0125 -> 1.0125 Offset: 2.2ppm H2O zero 0.8994 -> .8989 Offset: 52.7ppm H2O span 1.0062 -> 1.0049 Offset: 16.02ppm Notes: Calibrated by Katrina. The H2O offset is large, but the change is coefficients is small, so perhaps Katrina wrote down the wrong offset.
2018-10-04	75H-2669	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry for calibration. Replaced by sn 1594
2018-10-09	75H-2669	LI-7500A	Calibration	Lab	Last calibration: 2018-06-25 AGC=103 SDM=0 DAC1=0 DAC2=0 Ambient P=99.88kPa, Tair=27.1C, Tdew=12.9C Zero Air at 1425psi, AMP Air 408.97 at 1200 Tdewspan=16.00 CO2 zero 0.9182 -> .9180 Offset: -.8ppm CO2 span 1.0125 -> 1.0125 Offset: 2.2ppm H2O zero 0.8994 -> .8989 Offset: 52.7ppm H2O span 1.0062 -> 1.0049 Offset: 16.02ppm Notes: Calibrated by Katrina. The H2O offset is large, but the change is coefficients is small, so perhaps Katrina wrote down the wrong offset.
2020-08-28	75H-2669	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Mayberry to replace sn 0035 for calibration.
2021-03-01	75H-2669	LI-7500A	Calibration	Lab	Last calibration: 2020-08-27 AGC=101.8 SDM=0 DAC1=- DAC2=- Ambient P=100.4kPa, Tair=29.0C, Tdew=1.3C Zero Air at 500psi, AMP CA04396 408.97 at 300 Tdewspan=20.0 CO2 zero 0.9184 -> 0.9190 Offset: 2.3ppm CO2 span 1.0118 -> 1.0059 Offset: 3.03ppm H2O zero 0.9012 -> 0.8984 Offset: -17.2ppm H2O span 1.0121 -> 1.0033 Offset: 0.19ppm Notes: Flow rated larger than usual - 2lpm instead of 2cfpm. Dew point generator problems before cal - dew point stuck at 34 instead of 20C. The dewpt gen was fixed an ran at 20C before starting H2O span but dewpt initially jumped to 25C but steadily declined to 20C. I double checked CO2 zero/span and H2O zero afterwards and they seemed fine.
2020-12-09	75H-2669	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Mayberry for calibration. Replaced by sn 0073.
2021-03-01	75H-2669	LI-7500A	Calibration	Lab	Last calibration: 2020-08-27 AGC=101.8 SDM=0 DAC1=- DAC2=- Ambient P=100.4kPa, Tair=29.0C, Tdew=1.3C Zero Air at 500psi, AMP CA04396 408.97 at 300 Tdewspan=20.0 CO2 zero 0.9184 -> 0.9190 Offset: 2.3ppm CO2 span 1.0118 -> 1.0059 Offset: 3.03ppm H2O zero 0.9012 -> 0.8984 Offset: -17.2ppm H2O span 1.0121 -> 1.0033 Offset: 0.19ppm Notes: Flow rated larger than usual - 2lpm instead of 2cfpm. Dew point generator problems before cal - dew point stuck at 34 instead of 20C. The dewpt gen was fixed an ran at 20C before starting H2O span but dewpt initially jumped to 25C but steadily declined to 20C. I double checked CO2 zero/span and H2O zero afterwards and they seemed fine.
2011-02-03	TG1-0155	LI-7700	Installed	Gas Analyzer CH4	Installed on the Mayberry tower to replace the 7700 that was on loan to us from Licor. Collecting data on the CR1000 by direct ethernet to 7700.
2011-06-30	TG1-0155	LI-7700	Calibration	Gas Analyzer CH4	I removed the solar shield and installed the calibration hood. I was able to connect to the LI7700 through the LI7550 using Ethernet. I changed the wash cycle from 20sec spray rechecked every 15min to a 10sec spray rechecked every 3hr as suggested by Liukang. I flowed zero air from a small transfer tank at about 400psi. The LI7700 reported 0ppm CH4. I then flowed 1.976ppm secondary standard from the tank that used to be at Sherman. The LI7700 reported 1.976ppm CH4. Because the LI7700 seemed to be right on I did not to a formal calibration.
2011-11-22	TG1-0155	LI-7700	Calibration	Gas Analyzer CH4	After cleaning the mirrors the RSSI was 69. We tried to check the calibration of the LI7700. I put the hood on the 7700 and ran zero air through it. I watched the value on the CR1000. It got down to about 10ppb - not as good as I expected. I tried to run a span gas but didn't have the correct regulator.
2012-04-24	TG1-0155	LI-7700	Removed	Gas Analyzer CH4	Removed from the Mayberry eddy tower. Replaced with LI-7700 sn TG1-0224
2023-07-24	TG1-0211	LI-7700	Installed	Gas Analyzer CH4	Installed at Mayberry to replace sn TG1-0223 for calibration.
2024-01-11	TG1-0211	LI-7700	Calibration		Calibration Location: Mayberry Last calibration: 2023-07-20 RSSI=71%, Optical RH=3% Ambient P=102.1kPa, Tair=11.5C Zero Air at 1850psi, AMP CA03923 3.3865 at 1700 CH4 Zero Offset: .032ppm CH4 Span Offset: .0095ppm Notes: Breezy day
2024-08-07	TG1-0211	LI-7700	Calibration		Calibration Location: Mayberry Last calibration: 2024-01-11 RSSI=71%, Optical RH=7% Ambient P=100.9kPa, Tair=32.2C Zero Air at 1650psi, AMP CA03923 3.3865 at 1850 CH4 Zero Offset: .023ppm CH4 Span Offset: -0.0135ppm Notes: Breezy
2025-02-19	TG1-0211	LI-7700	Calibration		Calibration Location: Mayberry Last calibration: 2024-08-07 RSSI=71%, Optical RH=12% Ambient P=102.0kPa, Tair=16.0C Zero Air at 450psi, AMP CA03923 3.3865 at 1500 CH4 Zero Offset: -0.042ppm CH4 Span Offset: -0.015ppm Notes: Slight breeze
2018-05-03	TG1-0223	LI-7700	Installed	Gas Analyzer CH4	Installed at MB to replace sn TG1-0423, which was brought back to the lab for calibration.
2018-10-25	TG1-0223	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: MB Last calibration: 2018-04-25 RSSI=81%, Optical RH=8% Ambient P=101.6kPa, Tair=20.5C Zero Air at 2000psi, AMP Air 3.121 at 2100 CH4 Zero Offset: 0.021ppm CH4 Span Offset: 0.018ppm Notes: Calm day
2019-04-25	TG1-0223	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: MB Last calibration: 2018-10-26 RSSI=80%, Optical RH=12% Ambient P=100.9kPa, Tair=26C Zero Air at 1600psi, AMP CA3923 3.121 at 1600 CH4 Zero Offset: 0.013ppm CH4 Span Offset: 0.015ppm Notes: TC module swapped before calibration; breezy day
2019-04-25	TG1-0223	LI-7700	Upgrade	Gas Analyzer CH4	The thermocouple module was broken so we swapped it for a new one. The LI-7700 firmware was upgraded from v1.0.21 to v1.0.27 mostly minor bug fixes see change log https://www.licor.com/env/support/LI-7700/topics/change-log.html
2019-10-22	TG1-0223	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: Mayberry Last calibration: 2019-04-25 RSSI=84.7%, Optical RH=28% Ambient P=101.6kPa, Tair=29.7C Zero Air at 1200psi, AMP CA03923 3.121 at 1200 CH4 Zero Offset: -0.075ppm CH4 Span Offset: 0.007ppm Notes: Slightly larger zero offset but span seems good. After calibration swapped optics desiccant and dried head space with cal gas. New RH 11%.
2020-05-21	TG1-0223	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: Mayberry Last calibration: 2019-10-22 RSSI=83%, Optical RH=26% Ambient P=101.2kPa, Tair=21.8C Zero Air at 750psi, AMP CA3923 3.121 at 800 CH4 Zero Offset: 0.004ppm CH4 Span Offset: -0.003ppm Notes: Breezy day. Swapped optics drierite after calibration and used cal gas to dry head space. New optics RH was 9%.
2020-11-12	TG1-0223	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: Mayberry Last calibration: 2020-05-22 RSSI=78%, Optical RH=26% Ambient P=101.6kPa, Tair=11.6C Zero Air at 700psi, AMP CA3923 3.121 at 700 CH4 Zero Offset: 0.011ppm CH4 Span Offset: 0.002ppm Notes: Still day. Swapped out pink silica gel and put in fresh drierite in the optics chem bottle. Used zero air to flush head space down to 9% RH. Optics RH was 12% when we left the site.
2021-05-26	TG1-0223	LI-7700	Calibration		Calibration Location: Mayberry Last calibration: 2020-11-16 RSSI=77%, Optical RH=25% Ambient P=101.0kPa, Tair=27.8C AMP FB03864 at 1200psi, AMP CA04119 4.223 at 2000 CH4 Zero Offset: -0.028ppm CH4 Span Offset: -0.003ppm Notes: Breezy day. Zero gas was an AMP cal gas in a baby tank that we borrowed for the day. After the calibration, we used the zero air to flush the headspace until optics RH = 10%. The drierite was purple, so we swapped in a new bottle with fresh drierite.
2021-11-23	TG1-0223	LI-7700	Upgrade	Gas Analyzer CH4	Upgraded the firmware from v1.0.27 to v1.0.29. The sensor restarted succesfully and all seems well.
2021-12-01	TG1-0223	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: Mayberry Last calibration: 2021-06-01 RSSI=85%, Optical RH=22% Ambient P=101.8kPa, Tair=9.3C Zero Air at 600psi, AMP CA04396 1.9317 at 1650 CH4 Zero Offset: 0.034ppm CH4 Span Offset: -0.0157ppm Notes: A lot of fog in the air so it was hard for RSSI to go >60 even when clean. The RSSI increased to 85 when we put the hood on. Relatively still day. After calibration, we dried down the sensor headspace with zero air until optics RH=10%. We swapped out the old drierite for fresh drierite.
2022-05-27	TG1-0223	LI-7700	Removed	Gas Analyzer CH4	Removed from Mayberry because water got inside and rotted out the fuse on the bottom of the can. Same as WP a few weeks ago.
2022-06-08	TG1-0223	LI-7700	Installed	Gas Analyzer CH4	Installed at MB after attaching a new fuse holder and fuse. This sensor was calibrated in the lab yesterday.
2022-12-13	TG1-0223	LI-7700	Maintenance	Gas Analyzer CH4	The humidity reading was 31%. I swapped the desiccant bottle refilling it with silica gel desiccant. The humidity didn't change and hopefully will go down. Swap with regular dri-rite at calibration next time.
2023-01-18	TG1-0223	LI-7700	Calibration		Calibration Location: Mayberry Last calibration: 2022-06-07 RSSI=84%, Optical RH=15% Ambient P=101.9kPa, Tair=9.9C Zero Air at 1500psi, AMP CA04396 1.9317 at 1350 CH4 Zero Offset: .011ppm CH4 Span Offset: .0093ppm Notes: Did not flush headspace or change desiccant afterwards
2023-07-24	TG1-0223	LI-7700	Removed	Gas Analyzer CH4	Removed from Mayberry for calibration. Replaced by sn TG1-0211.
2012-04-24	TG1-0224	LI-7700	Installed	Gas Analyzer CH4	Installed on the Mayberry eddy tower to swap out LI-7700 sn TG1-0155
2012-09-06	TG1-0224	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: Mayberry Last calibration: 2012-01-19 RSSI=58%, Optical RH=% Ambient P=101.37kPa, Tair=17.0C ultra zero air at 1900psi, ch4 in air 4.982 at 950 CH4 Zero Offset: 0.034ppm CH4 Span Offset: 0.016ppm Notes: Calibrated in the field by Joe and Cove
2013-02-21	TG1-0224	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: Mayberry Last calibration: 2012-09-06 RSSI=85%, Optical RH=3% Ambient P=101.97kPa, Tair=14.4C Zero Air at 1800psi, 2nd CH4 in Air 4.982 at 1300 CH4 Zero Offset: 0.011ppm CH4 Span Offset: 0.010ppm Notes: The 7700 had lost line lock and was manually lock prior to calibration.
2013-08-21	TG1-0224	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: Mayberry Last calibration: 2013-02-21 RSSI=82%, Optical RH=8% Ambient P=101.0kPa, Tair=24.2C Zero Air at 1700psi, CH4 in air 4.995 at 1300 CH4 Zero Offset: 0.000ppm CH4 Span Offset: -0.026ppm Notes: It was windy but seemed to have no effect. The concentration of the secondary ch4 standard has been reevaluated since last cal. Last time 4.982, now 4.995
2014-03-07	TG1-0224	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: Mayberry Last calibration: 2013-08-21 RSSI=86%, Optical RH=14% Ambient P=101.9kPa, Tair=22.0C Zero Air at 1600psi, 2nd CH4 4.995 at 1100 CH4 Zero Offset: 0.02ppm CH4 Span Offset: 0.015ppm Notes: Calibrated by Cove and Sara after firmware upgrade to v1.0.21
2014-04-28	TG1-0224	LI-7700	Installed	Gas Analyzer CH4	Installed on the Mayberry Portable tower with LI-7500 sn 75H-2176 and LI-7550 sn AIU-0397. This tower is mounted in the back of Dennis's truck and will be moved between two locations on a roughly weekly basis.
2014-04-28	TG1-0224	LI-7700	Removed	Gas Analyzer CH4	Removed from the permanent Mayberry tower and installed on the portable tower. Replaced by Ameriflux sn TG1-0352
2014-08-19	TG1-0224	LI-7700	Installed	Gas Analyzer CH4	Installed on the Mayberry tower with 7500 sn 75H-2514 and 7550 sn AIU-1285to replace the Ameriflux emergency response GHG system.
2014-12-23	TG1-0224	LI-7700	Removed	Gas Analyzer CH4	Removed from the Mayberry Tower because it has a problem controlling the wash pump. Replaced by sn TG1-0357.
2014-04-28	TG1-0352	LI-7700	Installed	Gas Analyzer CH4	This is a borrowed sensor. It was installed on the Mayberry permanent tower to replace sn TG1-0224 for use on the portable tower.
2014-08-19	TG1-0352	LI-7700	Removed	Gas Analyzer CH4	This is part of the emergency response GHG system borrowed from Ameriflux. Removed from the Mayberry Tower with 7500 sn 75H-2339, 7550 sn AIU-0915 and returned to Stephen at LBNL Ameriflux.
2014-12-23	TG1-0357	LI-7700	Installed	Gas Analyzer CH4	Installed on the Mayberry tower to replace sn TG1-0224 that has a problem controlling the washer pump.
2015-06-18	TG1-0357	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: Mayberry Last calibration: 2014-12-22 RSSI=71.7%, Optical RH=2% Ambient P=101.2kPa, Tair=20.8C Zero Air at 1200psi, AMP CH4 1.9966 at 1800 CH4 Zero Offset: 0.016ppm CH4 Span Offset: 0.008ppm Notes: Gusty wind
2015-09-30	TG1-0357	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: Mayberry Last calibration: 2015-06-18 RSSI=73.7%, Optical RH=3% Ambient P=101.46kPa, Tair=17.1C Zero Air at 1100psi, AMP CH4 1.9966 at 1650 CH4 Zero Offset: 0.049ppm CH4 Span Offset: 0.0024ppm Notes: Breezy - started to rain later in the day
2016-04-13	TG1-0357	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: Mayberry Last calibration: 2015-09-30 RSSI=78.3%, Optical RH=7.5% Ambient P=102.1kPa, Tair=15.8C Zero Air at 1000psi, AMP CH4 1200 at 1.9966 CH4 Zero Offset: -0.024ppm CH4 Span Offset: -0.009ppm Notes: Gusty breeze, dropped the hood in the water before calibration - dried it off.
2016-10-11	TG1-0357	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: Mayberry Last calibration: 2016-04-13 RSSI=73.6%, Optical RH=13% Ambient P=101.6kPa, Tair=18.3C zero air at 850psi, AMP CH4 4.030 at 1900 CH4 Zero Offset: 0.020ppm CH4 Span Offset: 0.025ppm Notes: Windy.
2017-03-23	TG1-0357	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: Mayberry Last calibration: 2016-10-11 RSSI=77.3%, Optical RH=17% Ambient P=102.1kPa, Tair=17.0C Zero Air at 750psi, Ameriflux CH4 4.0304 at 600 CH4 Zero Offset: 0.032ppm CH4 Span Offset: -0.0277ppm Notes: Changed dessicant and flushed out head with dry air.
2017-10-26	TG1-0357	LI-7700	Removed	Gas Analyzer CH4	Removed from MB and brought back to the lab for calibration
2017-10-26	TG1-0423	LI-7700	Installed	Gas Analyzer CH4	Installed at MB to replace sn TG1-0357
2018-05-03	TG1-0423	LI-7700	Removed	Gas Analyzer CH4	Removed from MB and brought back to the lab for calibration. It was replaced by TG1-0423.

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