Equipment and Calibration

Equipment history at East End

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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
2019-05-02	0035	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at EE to replace sn 75H-2667, which was brought back to the lab for calibration.
2019-08-01	0035	LI-7500A	Calibration	Lab	Last calibration: 2019-04-26 AGC=99.2 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=24.0C, Tdew=13.8C Zero Air at 975psi, AMP CA4396 408.97 at 800 Tdewspan=20.00 CO2 zero 0.9371 -> .9374 Offset: 1.23ppm CO2 span 1.0189 -> 1.0207 Offset: -.96ppm H2O zero 0.8989 -> .8984 Offset: -2.9ppm H2O span 1.0186 -> 1.0323 Offset: -.29ppm Notes: When the SS was 99.2, 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	0035	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from EE and brought back to the lab for calibration. it was replaced by 75H-2176.
2019-08-01	0035	LI-7500A	Calibration	Lab	Last calibration: 2019-04-26 AGC=99.2 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=24.0C, Tdew=13.8C Zero Air at 975psi, AMP CA4396 408.97 at 800 Tdewspan=20.00 CO2 zero 0.9371 -> .9374 Offset: 1.23ppm CO2 span 1.0189 -> 1.0207 Offset: -.96ppm H2O zero 0.8989 -> .8984 Offset: -2.9ppm H2O span 1.0186 -> 1.0323 Offset: -.29ppm Notes: When the SS was 99.2, 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.
2014-06-05	0041	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the East End tower to replace sn 1594 for calibration.
2014-12-22	0041	LI-7500A	Calibration	Lab	Last calibration: 2014-06-04 AGC=51 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=101.23kPa, Tair=22.30C, Tdew=13.20C Zero Air at 1000psi, God CO2 421.22 at 1300 Tdewspan=15.95 CO2 zero 1.0009 -> 1.0008 Offset: -0.1ppm CO2 span 1.0101 -> 1.0116 Offset: -0.82ppm H2O zero 0.8235 -> 0.8242 Offset: 4.1ppm H2O span 1.0013 -> 1.1234 Offset: -2.69ppm Notes: Dew point drifting up after calibration - might have been dew point generator.
2014-09-25	0041	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the East End tower for calibration. Replaced by sn 0073.
2014-12-22	0041	LI-7500A	Calibration	Lab	Last calibration: 2014-06-04 AGC=51 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=101.23kPa, Tair=22.30C, Tdew=13.20C Zero Air at 1000psi, God CO2 421.22 at 1300 Tdewspan=15.95 CO2 zero 1.0009 -> 1.0008 Offset: -0.1ppm CO2 span 1.0101 -> 1.0116 Offset: -0.82ppm H2O zero 0.8235 -> 0.8242 Offset: 4.1ppm H2O span 1.0013 -> 1.1234 Offset: -2.69ppm Notes: Dew point drifting up after calibration - might have been dew point generator.
2017-09-13	0041	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace sn 75H-2150 for calibration.
2018-02-20	0041	LI-7500A	Calibration	Lab	Last calibration: 2017-09-11 AGC=98.4 SDM=0 DAC1=0 DAC2=0 Ambient P=101.1kPa, Tair=23.8C, Tdew=-2.4C Zero Air at 250psi, LBL Air 408.97 at 1700 Tdewspan=16.00 CO2 zero 0.9969 -> .9971 Offset: .92ppm CO2 span 1.0155 -> 1.0195 Offset: -1.93ppm H2O zero 0.82 -> .8187 Offset: -7.5ppm H2O span 1.0217 -> 1.0217 Offset: 0ppm Notes: I didn't do a H2O span because the sensor's dewpoint measurement was hovering around 2C, and then dropping towards 0C over 30 minutes. There may be a problem with the dewpoint generator.
2017-12-18	0041	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration. Replaced by sn 75H-2669
2018-02-20	0041	LI-7500A	Calibration	Lab	Last calibration: 2017-09-11 AGC=98.4 SDM=0 DAC1=0 DAC2=0 Ambient P=101.1kPa, Tair=23.8C, Tdew=-2.4C Zero Air at 250psi, LBL Air 408.97 at 1700 Tdewspan=16.00 CO2 zero 0.9969 -> .9971 Offset: .92ppm CO2 span 1.0155 -> 1.0195 Offset: -1.93ppm H2O zero 0.82 -> .8187 Offset: -7.5ppm H2O span 1.0217 -> 1.0217 Offset: 0ppm Notes: I didn't do a H2O span because the sensor's dewpoint measurement was hovering around 2C, and then dropping towards 0C over 30 minutes. There may be a problem with the dewpoint generator.
2020-12-03	0041	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace sn 1594 for calibration.
2021-05-25	0041	LI-7500A	Calibration	Lab	Last calibration: 2020-12-02 AGC=100 SDM=0 DAC1=- DAC2=- Ambient P=100.7kPa, Tair=25.9C, Tdew=10.2C Zero Air at 350psi, AMP CA03923 474.19 at 500 Tdewspan=20.0 CO2 zero 0.9971 -> 0.9966 Offset: -1.8ppm CO2 span 1.019 -> 1.0137 Offset: 3.31ppm H2O zero 0.8209 -> 0.8206 Offset: -2.0ppm H2O span 1.0273 -> 1.0266 Offset: 0.02ppm Notes: I initially forgot to load the previous coefficients file. At that time the signal strength was reading 106.3 and I reset it to 100. Then I remembered to load the previous cal file but only the CO2 and H2O readings changed. It was calibrated with the correct coefficients.
2021-03-16	0041	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration and brought back to the lab. Replaced by sn 0065.
2021-05-25	0041	LI-7500A	Calibration	Lab	Last calibration: 2020-12-02 AGC=100 SDM=0 DAC1=- DAC2=- Ambient P=100.7kPa, Tair=25.9C, Tdew=10.2C Zero Air at 350psi, AMP CA03923 474.19 at 500 Tdewspan=20.0 CO2 zero 0.9971 -> 0.9966 Offset: -1.8ppm CO2 span 1.019 -> 1.0137 Offset: 3.31ppm H2O zero 0.8209 -> 0.8206 Offset: -2.0ppm H2O span 1.0273 -> 1.0266 Offset: 0.02ppm Notes: I initially forgot to load the previous coefficients file. At that time the signal strength was reading 106.3 and I reset it to 100. Then I remembered to load the previous cal file but only the CO2 and H2O readings changed. It was calibrated with the correct coefficients.
2022-03-31	0041	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace sn 0065 for calibration.
2022-11-15	0041	LI-7500A	Calibration	Lab	Last calibration: 2022-03-30 AGC=93.5 SDM= DAC1= DAC2= Ambient P=101.2kPa, Tair=22.9C, Tdew=.1C Zero Air at 1900psi, AMP CA04119 524.77 at 1350 Tdewspan=20.00 CO2 zero 0.9969 -> .9998 Offset: 9.35ppm CO2 span 1.0189 -> 1.0178 Offset: .23ppm H2O zero 0.8214 -> .8213 Offset: -.5ppm H2O span 1.0337 -> 1.0308 Offset: .07ppm Notes: Reset SS from 93.5 to 100 before calibrating. Used AMP LI-7550 sn AIU-1039.
2022-09-15	0041	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration. Replaced by sn 75H-2667.
2022-11-15	0041	LI-7500A	Calibration	Lab	Last calibration: 2022-03-30 AGC=93.5 SDM= DAC1= DAC2= Ambient P=101.2kPa, Tair=22.9C, Tdew=.1C Zero Air at 1900psi, AMP CA04119 524.77 at 1350 Tdewspan=20.00 CO2 zero 0.9969 -> .9998 Offset: 9.35ppm CO2 span 1.0189 -> 1.0178 Offset: .23ppm H2O zero 0.8214 -> .8213 Offset: -.5ppm H2O span 1.0337 -> 1.0308 Offset: .07ppm Notes: Reset SS from 93.5 to 100 before calibrating. Used AMP LI-7550 sn AIU-1039.
2020-05-19	0042	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace sn 75H-2182 for calibration.
2020-08-25	0042	LI-7500A	Calibration	Lab	Last calibration: 2020-05-13 AGC=99.6 SDM=0 DAC1=- DAC2=- Ambient P=100.2kPa, Tair=23.3C, Tdew=14.3C Zero Air at 700psi, AMP CA04396 408.97 at 500 Tdewspan=20.0 CO2 zero 0.9481 -> 0.9479 Offset: -0.8ppm CO2 span 1.0141 -> 1.0073 Offset: 3.43ppm H2O zero 0.8441 -> 0.8441 Offset: -0.5ppm H2O span 1.0271 -> 1.0268 Offset: 0ppm Notes:
2020-08-21	0042	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration. Replaced by sn 1594.
2020-08-25	0042	LI-7500A	Calibration	Lab	Last calibration: 2020-05-13 AGC=99.6 SDM=0 DAC1=- DAC2=- Ambient P=100.2kPa, Tair=23.3C, Tdew=14.3C Zero Air at 700psi, AMP CA04396 408.97 at 500 Tdewspan=20.0 CO2 zero 0.9481 -> 0.9479 Offset: -0.8ppm CO2 span 1.0141 -> 1.0073 Offset: 3.43ppm H2O zero 0.8441 -> 0.8441 Offset: -0.5ppm H2O span 1.0271 -> 1.0268 Offset: 0ppm Notes:
2017-06-01	0065	LI-7500A	Installed	Gas Analyzer T1 CO2/H2O	Installed at open water temporary tower in East End wetland
2017-11-28	0065	LI-7500A	Calibration	Lab	Last calibration: 2017-05-30 AGC=100.0 SDM=0 DAC1=0 DAC2=0 Ambient P=100.5kPa, Tair=23.0C, Tdew=8.7C Zero Air at 300psi, LBL Air 408.97 at 1700 Tdewspan=16.00 CO2 zero 0.8901 -> .8906 Offset: 2.12ppm CO2 span 1.013 -> 1.0163 Offset: -1.35ppm H2O zero 0.7087 -> .7083 Offset: -3.0ppm H2O span 1.0166 -> 1.0126 Offset: 0.08ppm Notes: Calibrated on 7550 software version 8.7.5
2017-10-19	0065	LI-7500A	Removed	Gas Analyzer T1 CO2/H2O	Removed with decommissioning of East End Open Water tower (temporary tower 1)
2017-11-28	0065	LI-7500A	Calibration	Lab	Last calibration: 2017-05-30 AGC=100.0 SDM=0 DAC1=0 DAC2=0 Ambient P=100.5kPa, Tair=23.0C, Tdew=8.7C Zero Air at 300psi, LBL Air 408.97 at 1700 Tdewspan=16.00 CO2 zero 0.8901 -> .8906 Offset: 2.12ppm CO2 span 1.013 -> 1.0163 Offset: -1.35ppm H2O zero 0.7087 -> .7083 Offset: -3.0ppm H2O span 1.0166 -> 1.0126 Offset: 0.08ppm Notes: Calibrated on 7550 software version 8.7.5
2021-03-16	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace sn 0041 for calibration.
2021-06-01	0065	LI-7500A	Calibration	Lab	Last calibration: 2021-03-15 AGC=101.2 SDM=0 DAC1=- DAC2=- Ambient P=100.4kPa, Tair=21.2C, Tdew=10.6C Zero Air at 300psi, AMP CA04119 524.77 at 1800 Tdewspan=16.0 CO2 zero 0.8914 -> 0.8913 Offset: -0.2ppm CO2 span 1.0153 -> 1.0201 Offset: -3.27ppm H2O zero 0.7311 -> 0.7305 Offset: -4.1ppm H2O span 1.017 -> 1.0158 Offset: 0.0ppm Notes:
2021-05-26	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration. Replaced by sn 1594.
2021-06-01	0065	LI-7500A	Calibration	Lab	Last calibration: 2021-03-15 AGC=101.2 SDM=0 DAC1=- DAC2=- Ambient P=100.4kPa, Tair=21.2C, Tdew=10.6C Zero Air at 300psi, AMP CA04119 524.77 at 1800 Tdewspan=16.0 CO2 zero 0.8914 -> 0.8913 Offset: -0.2ppm CO2 span 1.0153 -> 1.0201 Offset: -3.27ppm H2O zero 0.7311 -> 0.7305 Offset: -4.1ppm H2O span 1.017 -> 1.0158 Offset: 0.0ppm Notes:
2022-01-20	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace sn 75H-2667 for calibration.
2022-04-08	0065	LI-7500A	Calibration	Lab	Last calibration: 2022-01-11 AGC=100.9 SDM= DAC1= DAC2= Ambient P=100.7kPa, Tair=29.96C, Tdew=12.0C Zero Air at 750psi, AMP CA04119 524.77 at 1600 Tdewspan=20.00 CO2 zero 0.8912 -> .8908 Offset: -1.86ppm CO2 span 1.0205 -> 1.0198 Offset: .57ppm H2O zero 0.7314 -> .7308 Offset: -4.2ppm H2O span 1.0259 -> 1.0160 Offset: .22ppm Notes: In the field, this sensor had a SS ~110. In the lab the SS was much more normal ~100. I'm not sure why there is a difference, as the config file should be the same.
2022-03-31	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration. Replaced by sn 0041.
2022-04-08	0065	LI-7500A	Calibration	Lab	Last calibration: 2022-01-11 AGC=100.9 SDM= DAC1= DAC2= Ambient P=100.7kPa, Tair=29.96C, Tdew=12.0C Zero Air at 750psi, AMP CA04119 524.77 at 1600 Tdewspan=20.00 CO2 zero 0.8912 -> .8908 Offset: -1.86ppm CO2 span 1.0205 -> 1.0198 Offset: .57ppm H2O zero 0.7314 -> .7308 Offset: -4.2ppm H2O span 1.0259 -> 1.0160 Offset: .22ppm Notes: In the field, this sensor had a SS ~110. In the lab the SS was much more normal ~100. I'm not sure why there is a difference, as the config file should be the same.
2013-11-25	0073	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the East End Wetland tower to replace sn 0042 for calibration.
2014-02-28	0073	LI-7500A	Calibration	Lab	Last calibration: 2013-11-20 AGC=58 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=98.44kPa, Tair=19.43C, Tdew=9.72C Zero air at 1400psi, God CO2 421.22 at 1500 Tdewspan=15.17 CO2 zero 0.9579 -> 0.9578 Offset: -0.21ppm CO2 span 1.002 -> 1.0009 Offset: 0.58ppm H2O zero 0.7328 -> 0.7355 Offset: 16.5ppm H2O span 1.0042 -> 0.9972 Offset: 0.16ppm Notes: CO2 span a little unstable +-0.5ppm (usually +-0.05ppm)
2014-02-25	0073	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the East End tower for calibration. Replaced by sn 1594.
2014-02-28	0073	LI-7500A	Calibration	Lab	Last calibration: 2013-11-20 AGC=58 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=98.44kPa, Tair=19.43C, Tdew=9.72C Zero air at 1400psi, God CO2 421.22 at 1500 Tdewspan=15.17 CO2 zero 0.9579 -> 0.9578 Offset: -0.21ppm CO2 span 1.002 -> 1.0009 Offset: 0.58ppm H2O zero 0.7328 -> 0.7355 Offset: 16.5ppm H2O span 1.0042 -> 0.9972 Offset: 0.16ppm Notes: CO2 span a little unstable +-0.5ppm (usually +-0.05ppm)
2014-09-25	0073	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the East End tower to replace sn 0041 for calibration.
2015-04-06	0073	LI-7500A	Calibration	Lab	Last calibration: 2014-09-23 AGC=58 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.36kPa, Tair=18.6C, Tdew=4.76C Zero Air at 900psi, God CO2 421.22 at 1200 Tdewspan=15.97 CO2 zero 0.9586 -> 0.9578 Offset: -2.8ppm CO2 span 1.0023 -> 1.0031 Offset: -0.22ppm H2O zero 0.7382 -> 0.7355 Offset: -17ppm H2O span 1.0109 -> 1.0253 Offset: -0.27ppm Notes: The H2O span was unstable. Adding water to the dew point generator seemed to improve the situation but still variable.
2015-01-05	0073	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the tower with the rest of the equipment after the tower fell down in the wind on 12/30
2015-04-06	0073	LI-7500A	Calibration	Lab	Last calibration: 2014-09-23 AGC=58 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.36kPa, Tair=18.6C, Tdew=4.76C Zero Air at 900psi, God CO2 421.22 at 1200 Tdewspan=15.97 CO2 zero 0.9586 -> 0.9578 Offset: -2.8ppm CO2 span 1.0023 -> 1.0031 Offset: -0.22ppm H2O zero 0.7382 -> 0.7355 Offset: -17ppm H2O span 1.0109 -> 1.0253 Offset: -0.27ppm Notes: The H2O span was unstable. Adding water to the dew point generator seemed to improve the situation but still variable.
2018-04-20	0073	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at EE to replace sn 75H-2669, which was brought back to the lab for calibration.
2018-09-26	0073	LI-7500A	Calibration	Lab	Last calibration: 2018-04-13 AGC=99.7 SDM=0 DAC1=0 DAC2=0 Ambient P=100.5kPa, Tair=25.8C, Tdew=13.3C Zero Air at 1600psi, AMP Air 408.97 at 1200 Tdewspan=16.00 CO2 zero 0.9575 -> .9569 Offset: -2.02ppm CO2 span 1.0145 -> 1.0112 Offset: 1.56ppm H2O zero 0.7295 -> .7314 Offset: 2.0ppm H2O span 1.0131 -> 1.0183 Offset: -.12ppm Notes:
2018-07-12	0073	LI-7500A	Removed	Gas Analyzer CO2/H2O	This sensor was removed from EE and brought back to the lab for calibration. it was replaced by sn 75H-2176.
2018-09-26	0073	LI-7500A	Calibration	Lab	Last calibration: 2018-04-13 AGC=99.7 SDM=0 DAC1=0 DAC2=0 Ambient P=100.5kPa, Tair=25.8C, Tdew=13.3C Zero Air at 1600psi, AMP Air 408.97 at 1200 Tdewspan=16.00 CO2 zero 0.9575 -> .9569 Offset: -2.02ppm CO2 span 1.0145 -> 1.0112 Offset: 1.56ppm H2O zero 0.7295 -> .7314 Offset: 2.0ppm H2O span 1.0131 -> 1.0183 Offset: -.12ppm Notes:
2015-01-20	0418	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the repositioned scaffolding at East End with the rest of the sensors after the scaffolding fell over in the wind and was rebuilt.
2015-07-15	0418	LI-7500A	Calibration	Lab	Last calibration: 2015-01-13 AGC=49 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.4kPa, Tair=21.72C, Tdew=16.62C Zero Air at 800psi, God CO2 421.22 at 850 Tdewspan=11.08 CO2 zero 0.9011 -> 0.9016 Offset: 1.75ppm CO2 span 1.0015 -> 1.0064 Offset: -2.52ppm H2O zero 0.8534 -> 0.8550 Offset: 8.9ppm H2O span 0.9867 -> 0.9897 Offset: 0.04ppm Notes: External serial port did not work
2015-04-23	0418	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the East End tower for calibration. Replaced by sn 1594.
2015-07-15	0418	LI-7500A	Calibration	Lab	Last calibration: 2015-01-13 AGC=49 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.4kPa, Tair=21.72C, Tdew=16.62C Zero Air at 800psi, God CO2 421.22 at 850 Tdewspan=11.08 CO2 zero 0.9011 -> 0.9016 Offset: 1.75ppm CO2 span 1.0015 -> 1.0064 Offset: -2.52ppm H2O zero 0.8534 -> 0.8550 Offset: 8.9ppm H2O span 0.9867 -> 0.9897 Offset: 0.04ppm Notes: External serial port did not work
2014-02-25	1594	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the East End tower to replace sn 0073 for calibration
2014-06-05	1594	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration. Replaced by sn 0041
2015-04-23	1594	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Eat End tower to replace sn 0418 for calibration.
2015-07-20	1594	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End to be replaced by LI-7500A set.
2016-08-31	1594	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the East End tower to replace sn 75H-2150 for calibration.
2016-09-13	1594	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from EE tower for calibration. Replaced with 75H-2514. Accidentally swapped the LI7500 at EE at this date, had not reached it's official swap period.
2020-08-21	1594	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace sn 0042 for calibration.
2020-12-03	1594	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration. Replaced by sn 0041.
2021-05-26	1594	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace sn 0065 for calibration.
2021-10-07	1594	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration. Replaced by sn 75H-2667.
2025-01-15	1594	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace sn 75H-2669 for calibration.
2016-05-24	75H-2150	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed LI7500 at East End tower, replaced sn 75H-2514 which was taken down for calibration.
2016-09-12	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2016-05-13 AGC=99.0 SDM=6 DAC1=- DAC2=- Ambient P=99.83kPa, Tair=19.51C, Tdew=10.68C Zero Air at 400psi, God CO2 421.22 at 400 Tdewspan=10.6 CO2 zero 0.902 -> 0.9019 Offset: -0.58ppm CO2 span 1.008 -> 1.0084 Offset: -0.29ppm H2O zero 0.8668 -> 0.8662 Offset: -4.1ppm H2O span 1.0109 -> 1.0155 Offset: -0.1ppm Notes:
2016-08-31	75H-2150	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the East End tower for calibration. Replaced by sn 1594.
2016-09-12	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2016-05-13 AGC=99.0 SDM=6 DAC1=- DAC2=- Ambient P=99.83kPa, Tair=19.51C, Tdew=10.68C Zero Air at 400psi, God CO2 421.22 at 400 Tdewspan=10.6 CO2 zero 0.902 -> 0.9019 Offset: -0.58ppm CO2 span 1.008 -> 1.0084 Offset: -0.29ppm H2O zero 0.8668 -> 0.8662 Offset: -4.1ppm H2O span 1.0109 -> 1.0155 Offset: -0.1ppm Notes:
2017-06-14	75H-2150	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End after calibration in the lab to replace LI7500 sn 75H-2514.
2017-10-11	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2017-05-30 AGC=96.8 SDM=0 DAC1=- DAC2=- Ambient P=100.4kPa, Tair=23.9C, Tdew=5.5C Zero Air at 500psi, AMP CO2 408.97 at 2000 Tdewspan=16.0 CO2 zero 0.9024 -> 0.9018 Offset: -2.42ppm CO2 span 1.0194 -> 1.0070 Offset: 6.38ppm H2O zero 0.8664 -> 0.8649 Offset: -10.1ppm H2O span 0.9975 -> 1.0090 Offset: 0.24ppm Notes:
2017-09-13	75H-2150	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration. It was replaced by sn 0041.
2017-10-11	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2017-05-30 AGC=96.8 SDM=0 DAC1=- DAC2=- Ambient P=100.4kPa, Tair=23.9C, Tdew=5.5C Zero Air at 500psi, AMP CO2 408.97 at 2000 Tdewspan=16.0 CO2 zero 0.9024 -> 0.9018 Offset: -2.42ppm CO2 span 1.0194 -> 1.0070 Offset: 6.38ppm H2O zero 0.8664 -> 0.8649 Offset: -10.1ppm H2O span 0.9975 -> 1.0090 Offset: 0.24ppm Notes:
2018-10-28	75H-2150	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at EE to replace sn 75H-2176, which was brought back to the lab for calibration.
2019-04-15	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2018-10-24 AGC=97.2 SDM=0 DAC1=- DAC2=- Ambient P=100.19kPa, Tair=26.84C, Tdew=7.32C Zero Air 369068 at 1100psi, AMP CA04396 408.97 at 750 Tdewspan=15.99 CO2 zero 0.9021 -> 0.9014 Offset: -3.16ppm CO2 span 1.005 -> 1.0030 Offset: 0.86ppm H2O zero 0.866 -> 0.8671 Offset: 8.0ppm H2O span 1.0069 -> 1.0077 Offset: -0.02ppm Notes: By Joe
2019-02-12	75H-2150	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from EE and brought back to the lab for calibration. It was replaced by sn 75H-2667.
2019-04-15	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2018-10-24 AGC=97.2 SDM=0 DAC1=- DAC2=- Ambient P=100.19kPa, Tair=26.84C, Tdew=7.32C Zero Air 369068 at 1100psi, AMP CA04396 408.97 at 750 Tdewspan=15.99 CO2 zero 0.9021 -> 0.9014 Offset: -3.16ppm CO2 span 1.005 -> 1.0030 Offset: 0.86ppm H2O zero 0.866 -> 0.8671 Offset: 8.0ppm H2O span 1.0069 -> 1.0077 Offset: -0.02ppm Notes: By Joe
2015-10-29	75H-2176	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace sn 75H-2182 for calibration.
2016-02-22	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2015-10-28 AGC=91.38 SDM=6 DAC1=- DAC2=- Ambient P=100.94kPa, Tair=23.4C, Tdew=8.96C Zero Air at 650psi, God CO2 421.22 at 700 Tdewspan=11.09 CO2 zero 0.8691 -> 0.8692 Offset: 0.55ppm CO2 span 1.0177 -> 1.0205 Offset: -1.47ppm H2O zero 0.8565 -> 0.8564 Offset: -0.6ppm H2O span 1.0086 -> 1.0136 Offset: -0.1ppm Notes:
2016-02-11	75H-2176	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the East End tower for calibration. Replaced by sn 75H-2514
2016-02-22	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2015-10-28 AGC=91.38 SDM=6 DAC1=- DAC2=- Ambient P=100.94kPa, Tair=23.4C, Tdew=8.96C Zero Air at 650psi, God CO2 421.22 at 700 Tdewspan=11.09 CO2 zero 0.8691 -> 0.8692 Offset: 0.55ppm CO2 span 1.0177 -> 1.0205 Offset: -1.47ppm H2O zero 0.8565 -> 0.8564 Offset: -0.6ppm H2O span 1.0086 -> 1.0136 Offset: -0.1ppm Notes:
2018-07-12	75H-2176	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at EE to replace sn 0073, which was brought back to the lab for calibration.
2019-01-02	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2018-07-10 AGC=102 SDM=0 DAC1=0 DAC2=0 Ambient P=101.2kPa, Tair=20.5C, Tdew=3.3C Zero Air at 1250psi, AMP Air 408.97 at 850 Tdewspan=16.00 CO2 zero 0.8671 -> .8676 Offset: 2.45ppm CO2 span 1.0029 -> 1.0114 Offset: -4.48ppm H2O zero 0.848 -> .8525 Offset: 27.5ppm H2O span 0.9088 -> .8206 Offset: -.27ppm Notes: H2O zero offset larger than I expected, but H2O span seems fine.
2018-10-28	75H-2176	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from EE and brought back to the lab for calibration. It was replaced by sn 75H-2150.
2019-01-02	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2018-07-10 AGC=102 SDM=0 DAC1=0 DAC2=0 Ambient P=101.2kPa, Tair=20.5C, Tdew=3.3C Zero Air at 1250psi, AMP Air 408.97 at 850 Tdewspan=16.00 CO2 zero 0.8671 -> .8676 Offset: 2.45ppm CO2 span 1.0029 -> 1.0114 Offset: -4.48ppm H2O zero 0.848 -> .8525 Offset: 27.5ppm H2O span 0.9088 -> .8206 Offset: -.27ppm Notes: H2O zero offset larger than I expected, but H2O span seems fine.
2019-07-25	75H-2176	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at EE to replace sn 0035, which was brought back to the lab for calibration.
2019-11-13	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2019-07-24 AGC=99.5 SDM= DAC1= DAC2= Ambient P=100.5kPa, Tair=25.6C, Tdew=11.4C Zero Air at 900psi, AMP CA4396 408.97 at 650 Tdewspan=16.00 CO2 zero 0.8672 -> .8675 Offset: 1.36ppm CO2 span 1.0061 -> 1.0072 Offset: -.67ppm H2O zero 0.8521 -> .8520 Offset: -1.0ppm H2O span 0.9182 -> .9123 Offset: .13ppm Notes: Did an initial calibration yesterday using config file 2019-07-24, but it had a large H2O zero offset (-35.7 mmol/m3) and H2O span offset (1.53C). Today I did another calibration, again from the config file 2019-07-24. Today the H2O offset/span seem ok, so not sure what was happening yesterday. I saved today's new config file and deleted yesterday's to avoid confusion.
2019-10-31	75H-2176	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration. Replaced by sn 75H-2514.
2019-11-13	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2019-07-24 AGC=99.5 SDM= DAC1= DAC2= Ambient P=100.5kPa, Tair=25.6C, Tdew=11.4C Zero Air at 900psi, AMP CA4396 408.97 at 650 Tdewspan=16.00 CO2 zero 0.8672 -> .8675 Offset: 1.36ppm CO2 span 1.0061 -> 1.0072 Offset: -.67ppm H2O zero 0.8521 -> .8520 Offset: -1.0ppm H2O span 0.9182 -> .9123 Offset: .13ppm Notes: Did an initial calibration yesterday using config file 2019-07-24, but it had a large H2O zero offset (-35.7 mmol/m3) and H2O span offset (1.53C). Today I did another calibration, again from the config file 2019-07-24. Today the H2O offset/span seem ok, so not sure what was happening yesterday. I saved today's new config file and deleted yesterday's to avoid confusion.
2023-04-03	75H-2176	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace sn 75H-2669 for calibration.
2023-07-20	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2023-03-29 AGC=100.0 SDM= DAC1= DAC2= AIU sn AIU-1569, Presure A0=58.004, A1=15.479 Ambient P=100.6kPa, Tair=0C, Tdew=13.45C Zero Air at 1000psi, AMP CA04119 524.77 at 925 Tdewspan=16.00 CO2 zero 0.8679 -> .868 Offset: .3ppm CO2 span 1.013 -> 1.0095 Offset: 2.43ppm H2O zero 0.8562 -> .8525 Offset: -21.4ppm H2O span 0.9316 -> .9124 Offset: .43ppm Notes: Slightly larger H2O zero and span offset than usual. Vertical orientation.
2023-07-11	75H-2176	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration. Replaced by sn 75H-2667.
2023-07-20	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2023-03-29 AGC=100.0 SDM= DAC1= DAC2= AIU sn AIU-1569, Presure A0=58.004, A1=15.479 Ambient P=100.6kPa, Tair=0C, Tdew=13.45C Zero Air at 1000psi, AMP CA04119 524.77 at 925 Tdewspan=16.00 CO2 zero 0.8679 -> .868 Offset: .3ppm CO2 span 1.013 -> 1.0095 Offset: 2.43ppm H2O zero 0.8562 -> .8525 Offset: -21.4ppm H2O span 0.9316 -> .9124 Offset: .43ppm Notes: Slightly larger H2O zero and span offset than usual. Vertical orientation.
2024-01-04	75H-2180	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace sn 75H-2182 for calibration.
2024-03-23	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2024-01-03 AGC=101.4 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.0kPa, Tair=24.65C, Tdew=11.42C Zero Air at 300psi, AMP CA04119 524.77 at 550 Tdewspan=20.00 CO2 zero 0.9141 -> .9137 Offset: -1.89ppm CO2 span 1.0406 -> 1.0356 Offset: -2.97ppm H2O zero 0.8965 -> .8951 Offset: -8.2ppm H2O span 1.0383 -> 1.0393 Offset: -.01ppm Notes: Used "524.52" as span point in software, otherwise, the post-span reading was too high
2024-01-18	75H-2180	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration. Replaced by sn 75H-2182.
2024-03-23	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2024-01-03 AGC=101.4 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.0kPa, Tair=24.65C, Tdew=11.42C Zero Air at 300psi, AMP CA04119 524.77 at 550 Tdewspan=20.00 CO2 zero 0.9141 -> .9137 Offset: -1.89ppm CO2 span 1.0406 -> 1.0356 Offset: -2.97ppm H2O zero 0.8965 -> .8951 Offset: -8.2ppm H2O span 1.0383 -> 1.0393 Offset: -.01ppm Notes: Used "524.52" as span point in software, otherwise, the post-span reading was too high
2015-07-20	75H-2182	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the East End Tower to upgrade the eddy system - replacing older equipment
2015-11-10	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2015-07-15 AGC=87.4 SDM=6 DAC1=- DAC2=- Ambient P=100.94kPa, Tair=21.68C, Tdew=6.22C Zero Air at 700psi, God CO2 421.22 at 700 Tdewspan=11.08 CO2 zero 0.8825 -> 0.8833 Offset: 3.48ppm CO2 span 1.0064 -> 1.0197 Offset: -7.02ppm H2O zero 0.8458 -> 0.8464 Offset: 4.0ppm H2O span 1.0016 -> 1.0242 Offset: -0.43ppm Notes:
2015-10-29	75H-2182	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration. Replaced by sn 75H-2176
2015-11-10	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2015-07-15 AGC=87.4 SDM=6 DAC1=- DAC2=- Ambient P=100.94kPa, Tair=21.68C, Tdew=6.22C Zero Air at 700psi, God CO2 421.22 at 700 Tdewspan=11.08 CO2 zero 0.8825 -> 0.8833 Offset: 3.48ppm CO2 span 1.0064 -> 1.0197 Offset: -7.02ppm H2O zero 0.8458 -> 0.8464 Offset: 4.0ppm H2O span 1.0016 -> 1.0242 Offset: -0.43ppm Notes:
2020-02-20	75H-2182	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace sn 75H-2514 for calibration.
2020-05-20	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2020-02-19 AGC=100.0 SDM=0 DAC1=- DAC2=- Ambient P=100.9kPa, Tair=21.1C, Tdew=10.5C Zero Air at 800psi, AMP CA04396 408.97 at 600 Tdewspan=61.0 CO2 zero 0.885 -> 0.8849 Offset: -0.07ppm CO2 span 1.0232 -> 1.0267 Offset: -1.72ppm H2O zero 0.8459 -> 0.8471 Offset: 7.5ppm H2O span 1.0249 -> 1.0159 Offset: 0.18ppm Notes:
2020-05-19	75H-2182	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End and brought back to the lab for calibration. Replaced by sn 0042.
2020-05-20	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2020-02-19 AGC=100.0 SDM=0 DAC1=- DAC2=- Ambient P=100.9kPa, Tair=21.1C, Tdew=10.5C Zero Air at 800psi, AMP CA04396 408.97 at 600 Tdewspan=61.0 CO2 zero 0.885 -> 0.8849 Offset: -0.07ppm CO2 span 1.0232 -> 1.0267 Offset: -1.72ppm H2O zero 0.8459 -> 0.8471 Offset: 7.5ppm H2O span 1.0249 -> 1.0159 Offset: 0.18ppm Notes:
2023-10-27	75H-2182	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace sn 75H-2667 for calibration.
2024-01-10	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2023-10-23 AGC=103 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.21kPa, Tair=21.2C, Tdew=9.47C Zero Air at 450psi, AMP CA04119 524.77 at 650 Tdewspan=18.00 CO2 zero 0.8848 -> .885 Offset: .94ppm CO2 span 1.0124 -> 1.0163 Offset: -2.06ppm H2O zero 0.8311 -> .8326 Offset: 9.9ppm H2O span 1.0325 -> 1.0352 Offset: -.05ppm Notes: Vertical orientation. Reset SS from 103 to 100 after cal. Used nail polish to cover up some small patches of paint missing from the spars.
2024-01-04	75H-2182	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration. Replaced by sn 75H-2180.
2024-01-10	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2023-10-23 AGC=103 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.21kPa, Tair=21.2C, Tdew=9.47C Zero Air at 450psi, AMP CA04119 524.77 at 650 Tdewspan=18.00 CO2 zero 0.8848 -> .885 Offset: .94ppm CO2 span 1.0124 -> 1.0163 Offset: -2.06ppm H2O zero 0.8311 -> .8326 Offset: 9.9ppm H2O span 1.0325 -> 1.0352 Offset: -.05ppm Notes: Vertical orientation. Reset SS from 103 to 100 after cal. Used nail polish to cover up some small patches of paint missing from the spars.
2024-01-18	75H-2182	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace sn 75H-2180 for calibration.
2024-06-17	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2024-01-10 AGC=100.1 SDM=0 DAC1=- DAC2=- AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.1kPa, Tair=20.7C, Tdew=9.1C Zero Air at 1750psi, AMP CA04119 524.77 at 350 Tdewspan=61.0 CO2 zero 0.885 -> 0.8850 Offset: 0.10ppm CO2 span 1.0163 -> 1.0141 Offset: 1.57ppm H2O zero 0.8326 -> 0.8332 Offset: 3.9ppm H2O span 1.0352 -> 1.0365 Offset: -0.02ppm Notes:
2024-04-11	75H-2182	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration. Replaced by sn 75H-2669.
2024-06-17	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2024-01-10 AGC=100.1 SDM=0 DAC1=- DAC2=- AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.1kPa, Tair=20.7C, Tdew=9.1C Zero Air at 1750psi, AMP CA04119 524.77 at 350 Tdewspan=61.0 CO2 zero 0.885 -> 0.8850 Offset: 0.10ppm CO2 span 1.0163 -> 1.0141 Offset: 1.57ppm H2O zero 0.8326 -> 0.8332 Offset: 3.9ppm H2O span 1.0352 -> 1.0365 Offset: -0.02ppm Notes:
2016-02-11	75H-2514	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the East End tower to replace sn 75H-2176 for calibration
2016-06-03	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2016-02-09 AGC=103.3 SDM=6 DAC1=- DAC2=- Ambient P=100.04kPa, Tair=25.86C, Tdew=13.67C Zero Air at 500psi, God CO2 421.22 at 500 Tdewspan=15.08 CO2 zero 0.905 -> 0.9047 Offset: -1.32ppm CO2 span 1.0028 -> 1.0055 Offset: -1.52ppm H2O zero 0.8364 -> 0.8368 Offset: 15.3ppm H2O span 1.0226 -> 1.0150 Offset: 0.16ppm Notes: The spars were very dirty with clinging dust.
2016-05-24	75H-2514	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed LI7500 from East End tower for calibration. Replaced with LI 75H-2150.
2016-06-03	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2016-02-09 AGC=103.3 SDM=6 DAC1=- DAC2=- Ambient P=100.04kPa, Tair=25.86C, Tdew=13.67C Zero Air at 500psi, God CO2 421.22 at 500 Tdewspan=15.08 CO2 zero 0.905 -> 0.9047 Offset: -1.32ppm CO2 span 1.0028 -> 1.0055 Offset: -1.52ppm H2O zero 0.8364 -> 0.8368 Offset: 15.3ppm H2O span 1.0226 -> 1.0150 Offset: 0.16ppm Notes: The spars were very dirty with clinging dust.
2016-09-13	75H-2514	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at EE tower after calibration to replace sn 1594. Accidentally swapped the LI7500 at EE at this date, had not reached it's official swap period.
2016-12-23	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2016-09-12 AGC=103.3 SDM=1 DAC1=- DAC2=- Ambient P=99.98kPa, Tair=15.95C, Tdew=7.22C Zero Air at 300psi, God CO2 421.22 at 400 Tdewspan=14.00 CO2 zero 0.9054 -> 0.9054 Offset: -0.1ppm CO2 span 1.0092 -> 1.0135 Offset: -2.47ppm H2O zero 0.8371 -> 0.8356 Offset: -10.3ppm H2O span 1.0239 -> 1.0225 Offset: 0.04ppm Notes: First calibration after upgrading embedded software to v8.0.0. Changed bandwidth to 10Hz for 20Hz sampling.
2016-12-21	75H-2514	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration in the lab. Replaced by 75H-2669.
2016-12-23	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2016-09-12 AGC=103.3 SDM=1 DAC1=- DAC2=- Ambient P=99.98kPa, Tair=15.95C, Tdew=7.22C Zero Air at 300psi, God CO2 421.22 at 400 Tdewspan=14.00 CO2 zero 0.9054 -> 0.9054 Offset: -0.1ppm CO2 span 1.0092 -> 1.0135 Offset: -2.47ppm H2O zero 0.8371 -> 0.8356 Offset: -10.3ppm H2O span 1.0239 -> 1.0225 Offset: 0.04ppm Notes: First calibration after upgrading embedded software to v8.0.0. Changed bandwidth to 10Hz for 20Hz sampling.
2017-03-15	75H-2514	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace 75H-2669.
2017-06-20	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2017-03-14 AGC=102.2 SDM= DAC1= DAC2= Ambient P=100.9kPa, Tair=25.7C, Tdew=13.2C Zero Air at 1500psi, NOAA Ait 402.69 at 1650 Tdewspan=16.00 CO2 zero 0.9046 -> .9041 Offset: -2.08ppm CO2 span 1.0139 -> 1.0115 Offset: 0.96ppm H2O zero 0.8368 -> .8378 Offset: 6.4ppm H2O span 1.0106 -> 1.0019 Offset: 0.20ppm Notes:
2017-06-14	75H-2514	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed LI7500 from East End for calibration, replaced with 75H-2150.
2017-06-20	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2017-03-14 AGC=102.2 SDM= DAC1= DAC2= Ambient P=100.9kPa, Tair=25.7C, Tdew=13.2C Zero Air at 1500psi, NOAA Ait 402.69 at 1650 Tdewspan=16.00 CO2 zero 0.9046 -> .9041 Offset: -2.08ppm CO2 span 1.0139 -> 1.0115 Offset: 0.96ppm H2O zero 0.8368 -> .8378 Offset: 6.4ppm H2O span 1.0106 -> 1.0019 Offset: 0.20ppm Notes:
2019-10-31	75H-2514	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace sn 75H-2176 for calibration.
2020-03-02	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2019-10-30 AGC=100.2 SDM= DAC1= DAC2= Ambient P=100.5kPa, Tair=25.5C, Tdew=-6.0C Zero Air at 800psi, AMP CA4396 408.97 at 550 Tdewspan=16.00 CO2 zero 0.9047 -> .9051 Offset: 1.66ppm CO2 span 1.0064 -> 1.0104 Offset: -1.92ppm H2O zero 0.8391 -> .8393 Offset: 1.3ppm H2O span 1.0156 -> 1.0173 Offset: -.04ppm Notes: Ambient air very dry.
2020-02-20	75H-2514	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration. Replaced by sn 75H-2182.
2020-03-02	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2019-10-30 AGC=100.2 SDM= DAC1= DAC2= Ambient P=100.5kPa, Tair=25.5C, Tdew=-6.0C Zero Air at 800psi, AMP CA4396 408.97 at 550 Tdewspan=16.00 CO2 zero 0.9047 -> .9051 Offset: 1.66ppm CO2 span 1.0064 -> 1.0104 Offset: -1.92ppm H2O zero 0.8391 -> .8393 Offset: 1.3ppm H2O span 1.0156 -> 1.0173 Offset: -.04ppm Notes: Ambient air very dry.
2024-07-23	75H-2514	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace sn 75H-2669 for calibration.
2024-10-22	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2024-07-23 AGC=99.9 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.6kPa, Tair=25.4C, Tdew=11.9C Zero Air at 1100psi, AMP FB04319 514.07 at 850 Tdewspan=20.00 CO2 zero 0.9086 -> .9089 Offset: .9ppm CO2 span 0.988 -> .9962 Offset: -5.71ppm H2O zero 0.8457 -> .8476 Offset: 12.5ppm H2O span 0.9823 -> .9936 Offset: -.26ppm Notes:
2024-10-17	75H-2514	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration. Replaced by sn 75H-2669.
2024-10-22	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2024-07-23 AGC=99.9 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.6kPa, Tair=25.4C, Tdew=11.9C Zero Air at 1100psi, AMP FB04319 514.07 at 850 Tdewspan=20.00 CO2 zero 0.9086 -> .9089 Offset: .9ppm CO2 span 0.988 -> .9962 Offset: -5.71ppm H2O zero 0.8457 -> .8476 Offset: 12.5ppm H2O span 0.9823 -> .9936 Offset: -.26ppm Notes:
2019-02-12	75H-2667	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at EE to replace sn 75H-2150, which was brought back to the lab for calibration.
2019-07-24	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2019-02-11 AGC=104.1 SDM= DAC1= DAC2= Ambient P=100.4kPa, Tair=26.7C, Tdew=11.7C Zero Air at 1000psi, AMP CA4396 408.97 at 800 Tdewspan=20.00 CO2 zero 0.9425 -> .9413 Offset: -4.47ppm CO2 span 1.0143 -> 1.0158 Offset: -.77ppm H2O zero 0.8349 -> .8363 Offset: 8.7ppm H2O span 1.0222 -> 1.0222 Offset: -.02ppm Notes: When the SS was 104.1, I reset it to 100.0
2019-05-02	75H-2667	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from EE and brought back to the lab for calibration. it was replaced by sn 0035.
2019-07-24	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2019-02-11 AGC=104.1 SDM= DAC1= DAC2= Ambient P=100.4kPa, Tair=26.7C, Tdew=11.7C Zero Air at 1000psi, AMP CA4396 408.97 at 800 Tdewspan=20.00 CO2 zero 0.9425 -> .9413 Offset: -4.47ppm CO2 span 1.0143 -> 1.0158 Offset: -.77ppm H2O zero 0.8349 -> .8363 Offset: 8.7ppm H2O span 1.0222 -> 1.0222 Offset: -.02ppm Notes: When the SS was 104.1, I reset it to 100.0
2021-10-07	75H-2667	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace sn 1594 for calibration.
2022-03-02	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2021-09-29 AGC=100 SDM= DAC1= DAC2= Ambient P=100.5kPa, Tair=24.3C, Tdew=9.1C Zero Air at 950psi, AMP CA04119 524.77 at 1600 Tdewspan=20.00 CO2 zero 0.9411 -> .9412 Offset: .2ppm CO2 span 1.0174 -> 1.0171 Offset: .36ppm H2O zero 0.8413 -> .841 Offset: -2.1ppm H2O span 1.0281 -> 1.0180 Offset: .21ppm Notes:
2022-01-20	75H-2667	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration. Replaced by sn 0065.
2022-03-02	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2021-09-29 AGC=100 SDM= DAC1= DAC2= Ambient P=100.5kPa, Tair=24.3C, Tdew=9.1C Zero Air at 950psi, AMP CA04119 524.77 at 1600 Tdewspan=20.00 CO2 zero 0.9411 -> .9412 Offset: .2ppm CO2 span 1.0174 -> 1.0171 Offset: .36ppm H2O zero 0.8413 -> .841 Offset: -2.1ppm H2O span 1.0281 -> 1.0180 Offset: .21ppm Notes:
2022-09-15	75H-2667	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace sn 0041 for calibration.
2023-01-13	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2022-09-15 AGC=102 SDM= DAC1= DAC2= Ambient P=100.3kPa, Tair=20.6C, Tdew=12.3C Zero Air at 1600psi, AMP CA04119 524.77 at 1275 Tdewspan=16.00 CO2 zero 0.9413 -> .9418 Offset: 1.72ppm CO2 span 1.0204 -> 1.0233 Offset: -1.91ppm H2O zero 0.8407 -> .8421 Offset: 8.4ppm H2O span 1.0338 -> 1.0314 Offset: .05ppm Notes: Set span dew point to 16.00C because the usual 20.00C > room's dew point temp.
2023-01-06	75H-2667	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration. Replaced by sn 75H-2669.
2023-01-13	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2022-09-15 AGC=102 SDM= DAC1= DAC2= Ambient P=100.3kPa, Tair=20.6C, Tdew=12.3C Zero Air at 1600psi, AMP CA04119 524.77 at 1275 Tdewspan=16.00 CO2 zero 0.9413 -> .9418 Offset: 1.72ppm CO2 span 1.0204 -> 1.0233 Offset: -1.91ppm H2O zero 0.8407 -> .8421 Offset: 8.4ppm H2O span 1.0338 -> 1.0314 Offset: .05ppm Notes: Set span dew point to 16.00C because the usual 20.00C > room's dew point temp.
2023-07-11	75H-2667	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace sn 75H-2176 for calibration.
2023-12-20	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2023-07-10 AGC=100.0 SDM=0 DAC1=- DAC2=- AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=99.6kPa, Tair=21.7C, Tdew=10.4C Zero Air at 500psi, AMP CA04119 524.77 at 750 Tdewspan=18.0 CO2 zero 0.9411 -> 0.9413 Offset: 0.7ppm CO2 span 1.0232 -> 1.0207 Offset: 1.83ppm H2O zero 0.8427 -> 0.8427 Offset: 0.2ppm H2O span 1.0367 -> 1.0363 Offset: 0.01ppm Notes: Reset SS from 103.0, Database says last cal was 07-14, instrument says 07-10.
2023-10-27	75H-2667	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration. Replaced by sn 75H-2182.
2023-12-20	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2023-07-10 AGC=100.0 SDM=0 DAC1=- DAC2=- AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=99.6kPa, Tair=21.7C, Tdew=10.4C Zero Air at 500psi, AMP CA04119 524.77 at 750 Tdewspan=18.0 CO2 zero 0.9411 -> 0.9413 Offset: 0.7ppm CO2 span 1.0232 -> 1.0207 Offset: 1.83ppm H2O zero 0.8427 -> 0.8427 Offset: 0.2ppm H2O span 1.0367 -> 1.0363 Offset: 0.01ppm Notes: Reset SS from 103.0, Database says last cal was 07-14, instrument says 07-10.
2016-12-21	75H-2669	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End after calibration in the lab to replace 75H-2514
2017-03-21	75H-2669	LI-7500A	Calibration	Lab	Last calibration: 2016-12-19 AGC=104.3 SDM= DAC1= DAC2= Ambient P=99.8kPa, Tair=23.16C, Tdew=9.9C Zero Air at 1700psi, God CO2 421.22 at 350 Tdewspan=16.00 CO2 zero 0.9184 -> 0.9191 Offset: 2.77ppm CO2 span 1.0119 -> 1.0115 Offset: 0.10ppm H2O zero 0.8989 -> 0.8978 Offset: -7.0ppm H2O span 1.0109 -> 1.0138 Offset: -0.07ppm Notes:
2017-03-15	75H-2669	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End and brought back to lab for calibration. It was replaced by sn 75H-2514.
2017-03-21	75H-2669	LI-7500A	Calibration	Lab	Last calibration: 2016-12-19 AGC=104.3 SDM= DAC1= DAC2= Ambient P=99.8kPa, Tair=23.16C, Tdew=9.9C Zero Air at 1700psi, God CO2 421.22 at 350 Tdewspan=16.00 CO2 zero 0.9184 -> 0.9191 Offset: 2.77ppm CO2 span 1.0119 -> 1.0115 Offset: 0.10ppm H2O zero 0.8989 -> 0.8978 Offset: -7.0ppm H2O span 1.0109 -> 1.0138 Offset: -0.07ppm Notes:
2017-12-18	75H-2669	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on East End to replace sn 0041 for calibration. The AIU software was upgrade from v8.0.0 to v8.5.0
2018-06-25	75H-2669	LI-7500A	Calibration	Lab	Last calibration: 2017-12-15 AGC=104.2 SDM=0 DAC1=- DAC2=- Ambient P=100.4kPa, Tair=26.1C, Tdew=11.9C Zero Air at 350psi, AMP 408.97 at 1350 Tdewspan=15.99 CO2 zero 0.9187 -> 0.9182 Offset: -2.11ppm CO2 span 1.0157 -> 1.0125 Offset: 1.68ppm H2O zero 0.8988 -> 0.8994 Offset: 3.3ppm H2O span 1.0033 -> 1.0062 Offset: -0.06ppm Notes: Calibrated by Joe
2018-04-20	75H-2669	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from EE and brought back to the lab for calibration. It was replaced by sn 0073.
2018-06-25	75H-2669	LI-7500A	Calibration	Lab	Last calibration: 2017-12-15 AGC=104.2 SDM=0 DAC1=- DAC2=- Ambient P=100.4kPa, Tair=26.1C, Tdew=11.9C Zero Air at 350psi, AMP 408.97 at 1350 Tdewspan=15.99 CO2 zero 0.9187 -> 0.9182 Offset: -2.11ppm CO2 span 1.0157 -> 1.0125 Offset: 1.68ppm H2O zero 0.8988 -> 0.8994 Offset: 3.3ppm H2O span 1.0033 -> 1.0062 Offset: -0.06ppm Notes: Calibrated by Joe
2023-01-06	75H-2669	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace sn 75H-2667 for calibration.
2023-04-10	75H-2669	LI-7500A	Calibration	Lab	Last calibration: 2023-01-04 AGC=101.5 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=24.9C, Tdew=10.8C Zero Air at 1300psi, AMP CA04119 524.77 at 1150 Tdewspan=16.00 CO2 zero 0.9187 -> .9207 Offset: 7.69ppm CO2 span 1.0187 -> 1.0176 Offset: 0.83ppm H2O zero 0.9029 -> .9001 Offset: -17.3ppm H2O span 1.033 -> 1.0105 Offset: .47ppm Notes: Offsets are recorded using the 2023-01-04 calibration as the starting config file. Attempted calibration on 4/7 but the H2O zero offset was -38.3 after needing a long time (45+min) to stabilize. The H2O span offset never stabilized. I decided to swap the chemicals then and this is the first calibration since chemical swap.
2023-04-03	75H-2669	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration. Replaced by sn 75H-2176.
2023-04-10	75H-2669	LI-7500A	Calibration	Lab	Last calibration: 2023-01-04 AGC=101.5 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=24.9C, Tdew=10.8C Zero Air at 1300psi, AMP CA04119 524.77 at 1150 Tdewspan=16.00 CO2 zero 0.9187 -> .9207 Offset: 7.69ppm CO2 span 1.0187 -> 1.0176 Offset: 0.83ppm H2O zero 0.9029 -> .9001 Offset: -17.3ppm H2O span 1.033 -> 1.0105 Offset: .47ppm Notes: Offsets are recorded using the 2023-01-04 calibration as the starting config file. Attempted calibration on 4/7 but the H2O zero offset was -38.3 after needing a long time (45+min) to stabilize. The H2O span offset never stabilized. I decided to swap the chemicals then and this is the first calibration since chemical swap.
2024-04-11	75H-2669	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace sn 75H-2182 for calibration.
2024-10-16	75H-2669	LI-7500A	Calibration	Lab	Last calibration: 2024-04-10 AGC=99.8 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.4kPa, Tair=21.6C, Tdew=14.0C Zero Air at 1100psi, AMP FB04319 514.07 at 850 Tdewspan=20.00 CO2 zero 0.9189 -> .9203 Offset: 5.44ppm CO2 span 1.0177 -> 1.0143 Offset: 2.33ppm H2O zero 0.9012 -> .8979 Offset: -20.0ppm H2O span 1.0115 -> 1.0193 Offset: -.17ppm Notes:
2024-07-23	75H-2669	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration. Replaced by sn 75H-2514.
2024-10-16	75H-2669	LI-7500A	Calibration	Lab	Last calibration: 2024-04-10 AGC=99.8 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.4kPa, Tair=21.6C, Tdew=14.0C Zero Air at 1100psi, AMP FB04319 514.07 at 850 Tdewspan=20.00 CO2 zero 0.9189 -> .9203 Offset: 5.44ppm CO2 span 1.0177 -> 1.0143 Offset: 2.33ppm H2O zero 0.9012 -> .8979 Offset: -20.0ppm H2O span 1.0115 -> 1.0193 Offset: -.17ppm Notes:
2024-10-17	75H-2669	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at East End to replace sn 75H-2514 for calibration.
2025-01-27	75H-2669	LI-7500A	Calibration	Lab	Last calibration: 2024-10-16 AGC=99.2 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.7kPa, Tair=23.3C, Tdew=1.84C Zero Air at 825psi, AMP FB04319 514.07 at 300 Tdewspan=20.00 CO2 zero 0.9203 -> .9186 Offset: -6.74ppm CO2 span 1.0143 -> 1.0152 Offset: -.72ppm H2O zero 0.8979 -> .9018 Offset: 24.8ppm H2O span 1.0193 -> 1.0215 Offset: -.05ppm Notes: Software span point of 514.07 --> CO2 reading of 514.14 Software span point of 514.02 --> CO2 reading of 514.07
2025-01-15	75H-2669	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from East End for calibration. Replaced by sn 1594.
2025-01-27	75H-2669	LI-7500A	Calibration	Lab	Last calibration: 2024-10-16 AGC=99.2 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.7kPa, Tair=23.3C, Tdew=1.84C Zero Air at 825psi, AMP FB04319 514.07 at 300 Tdewspan=20.00 CO2 zero 0.9203 -> .9186 Offset: -6.74ppm CO2 span 1.0143 -> 1.0152 Offset: -.72ppm H2O zero 0.8979 -> .9018 Offset: 24.8ppm H2O span 1.0193 -> 1.0215 Offset: -.05ppm Notes: Software span point of 514.07 --> CO2 reading of 514.14 Software span point of 514.02 --> CO2 reading of 514.07
2014-02-25	TG1-0155	LI-7700	Removed	Gas Analyzer CH4	Removed from the Alfalfa tower along with its wash box to be installed on the East End Tower to replace sn TG1-0203 that was returned to Frank
2014-02-25	TG1-0155	LI-7700	Installed	Gas Analyzer CH4	Installed on the East End Tower with its wash box to replace sn TG1-0203 that was returned to Frank. This instrument came directly from Alfalfa.
2014-03-07	TG1-0155	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: East End Last calibration: 2013-03-20 RSSI=85%, Optical RH=19% Ambient P=102.8kPa, Tair=16.3C Zero Air at 1600psi, 2nd CH4 4.995 at 1100 CH4 Zero Offset: 0.03ppm CH4 Span Offset: 0.015ppm Notes: Calibrated by Cove and Sara. Firmware upgraded to v1.0.21 before cal. Windy day. A little fluctuation in span 5.01-4.995
2014-09-10	TG1-0155	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: East End Last calibration: 2014-03-07 RSSI=80%, Optical RH=23% Ambient P=101.23kPa, Tair=29.9C Zero Air at 1400psi, 2nd CH4 4.995 at 700 CH4 Zero Offset: 0.085ppm CH4 Span Offset: -0.195ppm Notes: Very hot day with no wind. Offsets larger than usual.
2014-12-23	TG1-0155	LI-7700	Removed	Gas Analyzer CH4	On power up the mirror would spin at top speed and not stop. Removed for testing in the lab.
2015-02-05	TG1-0155	LI-7700	Installed	Gas Analyzer CH4	Installed on the East End tower to replace sn TG1-0224 that has the pump control problem
2015-05-28	TG1-0155	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: East End Last calibration: 2015-01-21 RSSI=84%, Optical RH=4% Ambient P=101.54kPa, Tair=21C Zero Air at 1200psi, AMP CH4 1.9966 at 2050 CH4 Zero Offset: 0.026ppm CH4 Span Offset: 0.0ppm Notes: Light breeze, partly cloudy, warm
2015-09-30	TG1-0155	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: East End Last calibration: 2015-05-28 RSSI=73%, Optical RH=5% Ambient P=101.5kPa, Tair=18.8C Zero Air at 1000psi, AMP CH4 1.9966 at 1600 CH4 Zero Offset: 0.014ppm CH4 Span Offset: 0.0024ppm Notes: Raining, breezy, The clock was reading 1970 on arrival - fixed before calibration.
2016-04-13	TG1-0155	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: East End Last calibration: 2015-09-30 RSSI=86.86%, Optical RH=12% Ambient P=101.2kPa, Tair=20.94C Zero Air at 950psi, AMP CH4 1.9966 at 850 CH4 Zero Offset: 0.002ppm CH4 Span Offset: -0.010ppm Notes: Gusty breeze
2016-10-11	TG1-0155	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: East End Last calibration: 2016-04-13 RSSI=82%, Optical RH=21% Ambient P=101.6kPa, Tair=21.1C zero air at 800psi, AMP CH4 4.030 at 1400 CH4 Zero Offset: 0.020ppm CH4 Span Offset: 0.010ppm Notes: Breezy
2017-03-23	TG1-0155	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: East End Last calibration: 2016-10-11 RSSI=90.5%, Optical RH=25% Ambient P=102.2kPa, Tair=14.6C Zero Air at 750psi, Ameriflux CH4 4.0304 at 850 CH4 Zero Offset: -0.008ppm CH4 Span Offset: -0.0251ppm Notes: Changed dessicant but did not flush out head with dry air.
2017-11-10	TG1-0155	LI-7700	Removed	Gas Analyzer CH4	Removed from EE and brought back to the lab for calibration. It was replaced by sn TG1-0357.
2013-11-25	TG1-0203	LI-7700	Moved	Gas Analyzer CH4	The DWR Corn / Construction tower was decommissioned and rechristened at its new permanent location at the Twitchell East End Wetland
2014-02-25	TG1-0203	LI-7700	Removed	Gas Analyzer CH4	Removed from the East End tower with its wash box to be returned to Frank.
2015-01-20	TG1-0224	LI-7700	Installed	Gas Analyzer CH4	Reinstalled after being removed when the scaffolding fell over. This 7700 still has a wash pump control problem.
2015-02-05	TG1-0224	LI-7700	Removed	Gas Analyzer CH4	Removed from East End for testing in the lab due to the pump control problem. Replaced by sn TG1-0155
2017-11-10	TG1-0357	LI-7700	Installed	Gas Analyzer CH4	Installed at EE to replace sn TG1-0155, which was brought back to the lab for calibration.
2018-05-16	TG1-0357	LI-7700	Removed	Gas Analyzer CH4	Removed from the East End tower for calibration. Replaced by sn TG1-0421
2018-05-16	TG1-0421	LI-7700	Installed	Gas Analyzer CH4	Installed on the East End tower to replace sn TG1-0357 for calibration
2018-11-01	TG1-0421	LI-7700	Removed	Gas Analyzer CH4	Removed from EE and brought back to the lab for a power board replacement and calibration. It was replaced by sn TG1-0423
2018-11-01	TG1-0423	LI-7700	Installed	Gas Analyzer CH4	Installed at EE to replace sn TG1-0421, which was brought back to the lab for a power board replacement and calibration.
2019-02-12	TG1-0423	LI-7700	Upgrade	Gas Analyzer CH4	Upgraded firmware (embedded software) from 1.0.23 to 1.0.27. Licor change log: "Expanded a buffer in the DSP to prevent phase changes in the DSP data caused when the buffer filled up. This fixes the synchronization loss and resultant data loss between the LI-7550 and LI-7700."
2019-04-11	TG1-0423	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: East End Last calibration: 2018-10-30 RSSI=73%, Optical RH=11% Ambient P=101.9kPa, Tair=16.5C Zero Air M4002 at 1700psi, AMP CA03923 3.121 at 1800 CH4 Zero Offset: 0.036ppm CH4 Span Offset: 0.013ppm Notes: Windy day
2019-10-22	TG1-0423	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: East End Last calibration: 2019-04-11 RSSI=83%, Optical RH=17% Ambient P=102.0kPa, Tair=24.6C Zero Air at 1300psi, AMP CA03923 3.121 at 1400 CH4 Zero Offset: 0.023ppm CH4 Span Offset: -0.001ppm Notes:
2020-05-19	TG1-0423	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: East End Last calibration: 2019-10-22 RSSI=83%, Optical RH=20% Ambient P=101.5kPa, Tair=22.5C Zero Air at 900psi, AMP CA3923 3.121 at 850 CH4 Zero Offset: 0.01ppm CH4 Span Offset: 0.006ppm Notes: Swapped optics desiccant (indicating drierite) after calibration. Used zero air cal gas to dry out head space. New RH ~7%.
2020-11-19	TG1-0423	LI-7700	Calibration		Calibration Location: East End Last calibration: 2020-05-19 RSSI=77%, Optical RH=12% Ambient P=102.4kPa, Tair=18C Zero Air at 500psi, AMP CA3923 3.121 at 500 CH4 Zero Offset: -0.05ppm CH4 Span Offset: -0.002ppm Notes: Breezy day
2021-05-26	TG1-0423	LI-7700	Calibration		Calibration Location: East End Last calibration: 2020-11-19 RSSI=80%, Optical RH=13% Ambient P=101.5kPa, Tair=29.2C AMP FB04161 at 500psi, AMP CA04119 4.223 at 2050 CH4 Zero Offset: 0ppm CH4 Span Offset: 0.008ppm Notes: Relatively still day. Zero gas was an AMP cal gas in a baby tank that we borrowed for the day. Zero was right on.
2021-12-01	TG1-0423	LI-7700	Calibration		Calibration Location: East End Last calibration: 2021-06-01 RSSI=83%, Optical RH=15% Ambient P=101.2kPa, Tair=19.2C Zero Air at 1200psi, AMP CA04396 1.9317 at 1800 CH4 Zero Offset: .007ppm CH4 Span Offset: .0023ppm Notes: Relatively still day. Did not change drierite or flush headspace with zero air. Zero air tank pressure uncertain--wonky regulator.
2022-06-09	TG1-0423	LI-7700	Calibration		Calibration Location: East End Last calibration: 2021-12-01 RSSI=70%, Optical RH=17% Ambient P=101kPa, Tair=29.5C Zero Air at 350psi, AMP CA04119 4.2238 at 1550 CH4 Zero Offset: .015ppm CH4 Span Offset: -.0098ppm Notes: Hot day, some breeze. Did not change drierite or flush headspace with zero air.
2023-01-18	TG1-0423	LI-7700	Calibration		Calibration Location: East End Last calibration: 2022-06-09 RSSI=77%, Optical RH=21% Ambient P=101.9kPa, Tair=12.6C Zero Air at 1450psi, AMP CA04396 1.9317 at 1200 CH4 Zero Offset: .025ppm CH4 Span Offset: .0023ppm Notes: After calibration, changed desiccant and flushed headspace with zero air until optics RH=14%.
2023-06-15	TG1-0423	LI-7700	Calibration		Calibration Location: East End Last calibration: 2023-01-18 RSSI=82%, Optical RH=16% Ambient P=100.9kPa, Tair=26.7C Zero Air at 1150psi, AMP CA04119 4.2238 at 1000 CH4 Zero Offset: -.06ppm CH4 Span Offset: .0138ppm Notes: Optics RH=16%, which is pretty good, so we did not flush the headspace or change its desiccant.
2024-01-11	TG1-0423	LI-7700	Calibration		Calibration Location: East End Last calibration: 2023-06-15 RSSI=79%, Optical RH=23% Ambient P=102.2kPa, Tair=16.0C Zero Air at 1800psi, AMP CA03923 3.3865 at 1725 CH4 Zero Offset: .015ppm CH4 Span Offset: .0015ppm Notes: After calibration, flushed headspace with zero air until optics RH=9% and swapped in a bottle with fresh drierite.
2024-08-07	TG1-0423	LI-7700	Calibration		Calibration Location: East End Last calibration: 2024-01-11 RSSI=70%, Optical RH=4% Ambient P=101.1kPa, Tair=35.1C Zero Air at 1700psi, AMP CA03923 3.3865 at 1850 CH4 Zero Offset: -.028ppm CH4 Span Offset: -0.0185ppm Notes: Hot day
2025-02-19	TG1-0423	LI-7700	Calibration		Calibration Location: East End Last calibration: 2024-08-07 RSSI=76%, Optical RH=7% Ambient P=102.2kPa, Tair=14.5C Zero Air at 450psi, AMP CA03923 3.3865 at 1300 CH4 Zero Offset: 0.01ppm CH4 Span Offset: -0.0135ppm Notes: Starting to rain but hood kept mirrors clean during calibration

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