Equipment and Calibration

Equipment history at Bouldin Alfalfa

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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
2019-01-31	0035	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at BA to replace sn 75H-2667, which was brought back to the lab for calibration.
2019-04-26	0035	LI-7500A	Calibration	Lab	Last calibration: 2019-01-28 AGC=99.2 SDM= DAC1= DAC2= Ambient P=100.4kPa, Tair=22.6C, Tdew=10.7C Zero Air at 1100psi, AMP CA4396 408.97 at 700 Tdewspan=16.00 CO2 zero 0.9375 -> .9371 Offset: -1.79ppm CO2 span 1.0193 -> 1.0189 Offset: .25ppm H2O zero 0.8969 -> .8989 Offset: 12.3ppm H2O span 1.0023 -> 1.0186 Offset: -.34ppm Notes:
2019-04-25	0035	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa for calibration. Replaced by sn 75H-2180.
2019-04-26	0035	LI-7500A	Calibration	Lab	Last calibration: 2019-01-28 AGC=99.2 SDM= DAC1= DAC2= Ambient P=100.4kPa, Tair=22.6C, Tdew=10.7C Zero Air at 1100psi, AMP CA4396 408.97 at 700 Tdewspan=16.00 CO2 zero 0.9375 -> .9371 Offset: -1.79ppm CO2 span 1.0193 -> 1.0189 Offset: .25ppm H2O zero 0.8969 -> .8989 Offset: 12.3ppm H2O span 1.0023 -> 1.0186 Offset: -.34ppm Notes:
2020-02-20	0035	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Bouldin Alfalfa to replace sn 75H-2176 for calibration.
2020-05-20	0035	LI-7500A	Calibration	Lab	Last calibration: 2020-02-19 AGC=100.1 SDM=0 DAC1=- DAC2=- Ambient P=100.9kPa, Tair=19.9C, Tdew=9.64C Zero Air at 800psi, AMP CA04396 408.97 at 600 Tdewspan=16.0 CO2 zero 0.9373 -> 0.9677 Offset: 1.3ppm CO2 span 1.0158 -> 1.0289 Offset: -6.67ppm H2O zero 0.8981 -> 0.8989 Offset: 5.3ppm H2O span 1.0246 -> 1.0271 Offset: -0.06ppm Notes: Relatively large change in CO2 span
2020-05-19	0035	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa for calibration. Replaced by sn 75H-2667.
2020-05-20	0035	LI-7500A	Calibration	Lab	Last calibration: 2020-02-19 AGC=100.1 SDM=0 DAC1=- DAC2=- Ambient P=100.9kPa, Tair=19.9C, Tdew=9.64C Zero Air at 800psi, AMP CA04396 408.97 at 600 Tdewspan=16.0 CO2 zero 0.9373 -> 0.9677 Offset: 1.3ppm CO2 span 1.0158 -> 1.0289 Offset: -6.67ppm H2O zero 0.8981 -> 0.8989 Offset: 5.3ppm H2O span 1.0246 -> 1.0271 Offset: -0.06ppm Notes: Relatively large change in CO2 span
2021-09-15	0035	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Bouldin Alfalfa to replace sn 75H-2176 for calibration.
2022-01-11	0035	LI-7500A	Calibration	Lab	Last calibration: 2021-09-13 AGC=100 SDM= DAC1= DAC2= Ambient P=101.6kPa, Tair=27.9C, Tdew=7.6C Zero Air at 980psi, AMP CA04119 524.77 at 1675 Tdewspan=20.00 CO2 zero 0.9373 -> .9372 Offset: -.34ppm CO2 span 1.0163 -> 1.0128 Offset: 2.46ppm H2O zero 0.8991 -> .8986 Offset: -2.4ppm H2O span 1.0291 -> 1.0282 Offset: .02ppm Notes:
2021-12-14	0035	LI-7500A	Removed		Removed from Bouldin Alfalfa for calibration. Replaced by sn 75H-2514.
2022-01-11	0035	LI-7500A	Calibration	Lab	Last calibration: 2021-09-13 AGC=100 SDM= DAC1= DAC2= Ambient P=101.6kPa, Tair=27.9C, Tdew=7.6C Zero Air at 980psi, AMP CA04119 524.77 at 1675 Tdewspan=20.00 CO2 zero 0.9373 -> .9372 Offset: -.34ppm CO2 span 1.0163 -> 1.0128 Offset: 2.46ppm H2O zero 0.8991 -> .8986 Offset: -2.4ppm H2O span 1.0291 -> 1.0282 Offset: .02ppm Notes:
2023-04-11	0035	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Bouldin Alfalfa to replace sn 0073 for calibration.
2023-08-04	0035	LI-7500A	Calibration	Lab	Last calibration: 2023-04-12 AGC=99.4 SDM= DAC1= DAC2= AIU sn AIU-1569, Presure A0=58.004, A1=15.479 Ambient P=100.6kPa, Tair=22.6C, Tdew=13.4C Zero Air at 900psi, AMP CA04119 524.77 at 875 Tdewspan=16.00 CO2 zero 0.9375 -> .9377 Offset: 1.06ppm CO2 span 1.0253 -> 1.024 Offset: .82ppm H2O zero 0.8994 -> .8984 Offset: -6.2ppm H2O span 1.0291 -> 1.0205 Offset: .18ppm Notes: Used "span" point of 524.67 for span gas of 524.77. Vertical orientation.
2023-07-24	0035	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa for calibration. Replaced by sn 75H-2180.
2023-08-04	0035	LI-7500A	Calibration	Lab	Last calibration: 2023-04-12 AGC=99.4 SDM= DAC1= DAC2= AIU sn AIU-1569, Presure A0=58.004, A1=15.479 Ambient P=100.6kPa, Tair=22.6C, Tdew=13.4C Zero Air at 900psi, AMP CA04119 524.77 at 875 Tdewspan=16.00 CO2 zero 0.9375 -> .9377 Offset: 1.06ppm CO2 span 1.0253 -> 1.024 Offset: .82ppm H2O zero 0.8994 -> .8984 Offset: -6.2ppm H2O span 1.0291 -> 1.0205 Offset: .18ppm Notes: Used "span" point of 524.67 for span gas of 524.77. Vertical orientation.
2023-08-24	0035	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Bouldin Alfalfa to replace sn 75H-2180 for mount repair.
2024-01-02	0035	LI-7500A	Calibration	Lab	Last calibration: 2023-08-04 AGC=100.5 SDM=0 DAC1=- DAC2=- AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=101.0kPa, Tair=19.96C, Tdew=8.97C Zero Air at 550psi, AMP CA04119 524.77 at 750 Tdewspan=18.0 CO2 zero 0.9377 -> 0.9372 Offset: -2.0ppm CO2 span 1.024 -> 1.0267 Offset: -1.77ppm H2O zero 0.8984 -> 0.9006 Offset: 13.4ppm H2O span 1.0205 -> 1.0400 Offset: -0.4ppm Notes: I painted some scratches on the body with nail polish
2023-12-22	0035	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa for calibration. Replaced by sn 75H-2514.
2024-01-02	0035	LI-7500A	Calibration	Lab	Last calibration: 2023-08-04 AGC=100.5 SDM=0 DAC1=- DAC2=- AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=101.0kPa, Tair=19.96C, Tdew=8.97C Zero Air at 550psi, AMP CA04119 524.77 at 750 Tdewspan=18.0 CO2 zero 0.9377 -> 0.9372 Offset: -2.0ppm CO2 span 1.024 -> 1.0267 Offset: -1.77ppm H2O zero 0.8984 -> 0.9006 Offset: 13.4ppm H2O span 1.0205 -> 1.0400 Offset: -0.4ppm Notes: I painted some scratches on the body with nail polish
2017-09-19	0042	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at BA tower to replace sn 0073 for calibration.
2018-03-05	0042	LI-7500A	Calibration	Lab	Last calibration: 2017-05-05 AGC=98 SDM=0 DAC1=0 DAC2=0 Ambient P=101.4kPa, Tair=25.5C, Tdew=2.0C Zero Air at 150psi, LBL Air 408.97 at 1700 Tdewspan=16.00 CO2 zero 0.9847 -> .9485 Offset: 1.08ppm CO2 span 1.0244 -> 1.0124 Offset: -1.35ppm H2O zero 0.8434 -> .843 Offset: .7ppm H2O span 1.1404 -> 1.0225 Offset: -.11ppm Notes:
2017-12-19	0042	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa for calibration. Replaced by sn 75H-2667.
2018-03-05	0042	LI-7500A	Calibration	Lab	Last calibration: 2017-05-05 AGC=98 SDM=0 DAC1=0 DAC2=0 Ambient P=101.4kPa, Tair=25.5C, Tdew=2.0C Zero Air at 150psi, LBL Air 408.97 at 1700 Tdewspan=16.00 CO2 zero 0.9847 -> .9485 Offset: 1.08ppm CO2 span 1.0244 -> 1.0124 Offset: -1.35ppm H2O zero 0.8434 -> .843 Offset: .7ppm H2O span 1.1404 -> 1.0225 Offset: -.11ppm Notes:
2016-12-07	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the Bouldin Alfalfa tower to replace sn 75H-2667 for calibration.
2017-05-30	0065	LI-7500A	Calibration	Lab	Last calibration: 2016-12-06 AGC=100 SDM= DAC1= DAC2= Ambient P=99.7kPa, Tair=19.8C, Tdew=10.1C Zero Air at 1050psi, NOAA Air 402.69 at 1600 Tdewspan=16.00 CO2 zero 0.8899 -> .8901 Offset: 1.08ppm CO2 span 1.0142 -> 1.0130 Offset: -.84ppm H2O zero 0.7086 -> .7087 Offset: .6ppm H2O span 1.0127 -> 1.0166 Offset: -.08ppm Notes: Signal strength was 73.9 after thorough cleaning of lenses, so I reset the Signal Strength to 100%.
2017-03-23	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa and brought back to the lab for calibration. It was replaced by sn 75H-2667.
2017-05-30	0065	LI-7500A	Calibration	Lab	Last calibration: 2016-12-06 AGC=100 SDM= DAC1= DAC2= Ambient P=99.7kPa, Tair=19.8C, Tdew=10.1C Zero Air at 1050psi, NOAA Air 402.69 at 1600 Tdewspan=16.00 CO2 zero 0.8899 -> .8901 Offset: 1.08ppm CO2 span 1.0142 -> 1.0130 Offset: -.84ppm H2O zero 0.7086 -> .7087 Offset: .6ppm H2O span 1.0127 -> 1.0166 Offset: -.08ppm Notes: Signal strength was 73.9 after thorough cleaning of lenses, so I reset the Signal Strength to 100%.
2018-04-05	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at BA to replace sn 75H-2667, which was brought back to the lab for calibration.
2018-09-26	0065	LI-7500A	Calibration	Lab	Last calibration: 2018-04-04 AGC=99.7 SDM=0 DAC1=0 DAC2=0 Ambient P=100.4kPa, Tair=26.6C, Tdew=13.8C Zero Air at 1600psi, AMP Air 408.97 at 1200 Tdewspan=16.00 CO2 zero 0.8905 -> .8903 Offset: -1.09ppm CO2 span 1.0231 -> 1.0184 Offset: 2.48ppm H2O zero 0.7082 -> .7086 Offset: 2.7ppm H2O span 1.0185 -> 1.0155 Offset: .07ppm Notes:
2018-07-12	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from BA and brought back to the lab for calibration. It was replaced by sn 75H-2150.
2018-09-26	0065	LI-7500A	Calibration	Lab	Last calibration: 2018-04-04 AGC=99.7 SDM=0 DAC1=0 DAC2=0 Ambient P=100.4kPa, Tair=26.6C, Tdew=13.8C Zero Air at 1600psi, AMP Air 408.97 at 1200 Tdewspan=16.00 CO2 zero 0.8905 -> .8903 Offset: -1.09ppm CO2 span 1.0231 -> 1.0184 Offset: 2.48ppm H2O zero 0.7082 -> .7086 Offset: 2.7ppm H2O span 1.0185 -> 1.0155 Offset: .07ppm Notes:
2020-08-21	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Bouldin Alfalfa to replace sn 75H-2667 for calibration.
2020-12-08	0065	LI-7500A	Calibration	Lab	Last calibration: 2020-08-20 AGC=101 SDM= DAC1= DAC2= Ambient P=100.8kPa, Tair=23.1C, Tdew=2.5C Zero Air at 550psi, AMP CA4396 408.97 at 300 Tdewspan=20.00 CO2 zero 0.8917 -> .8916 Offset: -.35ppm CO2 span 1.0217 -> 1.0213 Offset: .27ppm H2O zero 0.7297 -> .7303 Offset: 4.5ppm H2O span 1.0186 -> 1.0165 Offset: .05ppm Notes:
2020-12-03	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa for calibration. Replaced by sn 75H-2182.
2020-12-08	0065	LI-7500A	Calibration	Lab	Last calibration: 2020-08-20 AGC=101 SDM= DAC1= DAC2= Ambient P=100.8kPa, Tair=23.1C, Tdew=2.5C Zero Air at 550psi, AMP CA4396 408.97 at 300 Tdewspan=20.00 CO2 zero 0.8917 -> .8916 Offset: -.35ppm CO2 span 1.0217 -> 1.0213 Offset: .27ppm H2O zero 0.7297 -> .7303 Offset: 4.5ppm H2O span 1.0186 -> 1.0165 Offset: .05ppm Notes:
2024-04-16	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Bouldin Alfalfa to replace sn 75H-2514 for calibration.
2024-09-26	0065	LI-7500A	Calibration	Lab	Last calibration: 2024-04-15 AGC=95.1 SDM=0 DAC1=- DAC2=- AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.0kPa, Tair=24.7C, Tdew=14.6C Zero Air at 1350psi, AMP CA03923 488.75 at 1450 Tdewspan=20.0 CO2 zero 0.8916 -> 0.8913 Offset: -1.5ppm CO2 span 1.024 -> 1.0229 Offset: 0.7ppm H2O zero 0.7329 -> 0.7336 Offset: 5.7ppm H2O span 1.021 -> 1.0269 Offset: -0.12ppm Notes:
2024-07-22	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa for calibration. Replaced by sn 75H-2667.
2024-09-26	0065	LI-7500A	Calibration	Lab	Last calibration: 2024-04-15 AGC=95.1 SDM=0 DAC1=- DAC2=- AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.0kPa, Tair=24.7C, Tdew=14.6C Zero Air at 1350psi, AMP CA03923 488.75 at 1450 Tdewspan=20.0 CO2 zero 0.8916 -> 0.8913 Offset: -1.5ppm CO2 span 1.024 -> 1.0229 Offset: 0.7ppm H2O zero 0.7329 -> 0.7336 Offset: 5.7ppm H2O span 1.021 -> 1.0269 Offset: -0.12ppm Notes:
2017-06-23	0073	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Bouldin Alfalfa to replace 75H-2667.
2017-11-27	0073	LI-7500A	Calibration	Lab	Last calibration: 2017-06-22 AGC=100.6 SDM=0 DAC1=0 DAC2=0 Ambient P=101.0kPa, Tair=21.6C, Tdew=6.8C Zero Air at 350psi, LBL Air 408.97 at 1750 Tdewspan=16.00 CO2 zero 0.9572 -> .9571 Offset: -0.028ppm CO2 span 1.0084 -> 1.0118 Offset: -2.11ppm H2O zero 0.7307 -> .7306 Offset: -0.3ppm H2O span 1.0045 -> 1.0000 Offset: 0.1ppm Notes: Calibrated on 7550 software version 8.5.0
2017-09-19	0073	LI-7500A	Removed	Gas Analyzer CO2/H2O	Brought back to the lab for calibration and replaced by sn 0042.
2017-11-27	0073	LI-7500A	Calibration	Lab	Last calibration: 2017-06-22 AGC=100.6 SDM=0 DAC1=0 DAC2=0 Ambient P=101.0kPa, Tair=21.6C, Tdew=6.8C Zero Air at 350psi, LBL Air 408.97 at 1750 Tdewspan=16.00 CO2 zero 0.9572 -> .9571 Offset: -0.028ppm CO2 span 1.0084 -> 1.0118 Offset: -2.11ppm H2O zero 0.7307 -> .7306 Offset: -0.3ppm H2O span 1.0045 -> 1.0000 Offset: 0.1ppm Notes: Calibrated on 7550 software version 8.5.0
2019-08-16	0073	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed for CH4 release experiment. This unit was part of a secondary, lower eddy system
2019-10-30	0073	LI-7500A	Calibration	Lab	Last calibration: 2019-08-14 AGC=99.6 SDM=0 DAC1=- DAC2=- Ambient P=101.0kPa, Tair=27.45C, Tdew=-10.8C Zero Air at 900psi, AMP CA04396 408.97 at 800 Tdewspan=20.0 CO2 zero 0.9576 -> 0.9574 Offset: -0.70ppm CO2 span 1.0095 -> 1.0091 Offset: 0.23ppm H2O zero 0.7318 -> 0.7311 Offset: -4.6ppm H2O span 1.0247 -> 1.0052 Offset: 0.4ppm Notes: Ambient air was very dry. Joe
2019-09-04	0073	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa with the end of the CH4 release experiment. This unit was at the top of the secondary tower
2019-10-30	0073	LI-7500A	Calibration	Lab	Last calibration: 2019-08-14 AGC=99.6 SDM=0 DAC1=- DAC2=- Ambient P=101.0kPa, Tair=27.45C, Tdew=-10.8C Zero Air at 900psi, AMP CA04396 408.97 at 800 Tdewspan=20.0 CO2 zero 0.9576 -> 0.9574 Offset: -0.70ppm CO2 span 1.0095 -> 1.0091 Offset: 0.23ppm H2O zero 0.7318 -> 0.7311 Offset: -4.6ppm H2O span 1.0247 -> 1.0052 Offset: 0.4ppm Notes: Ambient air was very dry. Joe
2022-11-18	0073	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Bouldin Alfalfa to replace sn 1594, which was removed for calibration.
2023-06-13	0073	LI-7500A	Calibration	Lab	Last calibration: 2022-11-15 AGC=102.2 SDM= DAC1= DAC2= AIU sn AIU-1569, Presure A0=58.004, A1=15.479 Ambient P=100.6kPa, Tair=18.8C, Tdew=11.8C Zero Air at 1150psi, AMP CA04119 524.77 at 1050 Tdewspan=16.01 CO2 zero 0.9165 -> 0.9161 Offset: -1.6ppm CO2 span 1.0085 -> 1.0093 Offset: -0.57ppm H2O zero 0.8296 -> 0.8328 Offset: 18.5ppm H2O span 1.0258 -> 1.0281 Offset: -0.4ppm Notes: Calibrate with IRGA vertical - slightly larger than usual H2O zero offset.
2023-04-11	0073	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa for calibration. Replaced by sn 0035.
2023-06-13	0073	LI-7500A	Calibration	Lab	Last calibration: 2022-11-15 AGC=102.2 SDM= DAC1= DAC2= AIU sn AIU-1569, Presure A0=58.004, A1=15.479 Ambient P=100.6kPa, Tair=18.8C, Tdew=11.8C Zero Air at 1150psi, AMP CA04119 524.77 at 1050 Tdewspan=16.01 CO2 zero 0.9165 -> 0.9161 Offset: -1.6ppm CO2 span 1.0085 -> 1.0093 Offset: -0.57ppm H2O zero 0.8296 -> 0.8328 Offset: 18.5ppm H2O span 1.0258 -> 1.0281 Offset: -0.4ppm Notes: Calibrate with IRGA vertical - slightly larger than usual H2O zero offset.
2024-11-06	0073	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Bouldin Alfalfa to replace sn 75H-2667 for calibration.
2025-01-30	0073	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa for calibration. Replaced by sn 75H-2669.
2022-04-13	1594	LI-7500A	Installed	Heat Flux Plate B	Installed at Bouldin Alfalfa to replace sn 75H-2176 for calibration.
2022-11-18	1594	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa for calibration. Replaced by sn 0073.
2018-07-12	75H-2150	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at BA to replace sn 0065, which was brought back to the lab for calibration.
2018-10-24	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2018-07-10 AGC=97.5 SDM=0 DAC1=0 DAC2=0 Ambient P=100.6kPa, Tair=26.7C, Tdew=11.95C Zero Air at 1500psi, AMP Air 408.97 at 1100 Tdewspan=16.00 CO2 zero 0.9017 -> .9021 Offset: 1.86ppm CO2 span 1.002 -> 1.0050 Offset: -1.74ppm H2O zero 0.8662 -> .8660 Offset: -1.9ppm H2O span 1.0069 -> 1.0069 Offset: 0.00ppm Notes: No change in H2O span.
2018-10-18	75H-2150	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa for calibration. Replaced by sn 75H-2667.
2018-10-24	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2018-07-10 AGC=97.5 SDM=0 DAC1=0 DAC2=0 Ambient P=100.6kPa, Tair=26.7C, Tdew=11.95C Zero Air at 1500psi, AMP Air 408.97 at 1100 Tdewspan=16.00 CO2 zero 0.9017 -> .9021 Offset: 1.86ppm CO2 span 1.002 -> 1.0050 Offset: -1.74ppm H2O zero 0.8662 -> .8660 Offset: -1.9ppm H2O span 1.0069 -> 1.0069 Offset: 0.00ppm Notes: No change in H2O span.
2019-08-07	75H-2150	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at BA to replace sn 75H-2180, which was brought back to the lab for calibration.
2020-02-11	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2019-08-01 AGC=101.0 SDM=0 DAC1=- DAC2=- Ambient P=100.8kPa, Tair=26.9C, Tdew=-1.45C Zero Air at 800psi, AMP CA04396 408.97 at 550 Tdewspan=16.0 CO2 zero 0.9022 -> 0.9030 Offset: 3.7ppm CO2 span 1.0086 -> 1.0154 Offset: -3.47ppm H2O zero 0.8673 -> 0.8674 Offset: 0.5ppm H2O span 1.0114 -> 1.0224 Offset: -0.23ppm Notes: First calibration after swapping chemicals and running on the bench for a week. I was expecting to see negative offsets from zero - may still drift a little lower. Ambient air very dry.
2019-11-14	75H-2150	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from BA and brought back to the lab for calibration. It was replaced by 75H-2176.
2020-02-11	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2019-08-01 AGC=101.0 SDM=0 DAC1=- DAC2=- Ambient P=100.8kPa, Tair=26.9C, Tdew=-1.45C Zero Air at 800psi, AMP CA04396 408.97 at 550 Tdewspan=16.0 CO2 zero 0.9022 -> 0.9030 Offset: 3.7ppm CO2 span 1.0086 -> 1.0154 Offset: -3.47ppm H2O zero 0.8673 -> 0.8674 Offset: 0.5ppm H2O span 1.0114 -> 1.0224 Offset: -0.23ppm Notes: First calibration after swapping chemicals and running on the bench for a week. I was expecting to see negative offsets from zero - may still drift a little lower. Ambient air very dry.
2019-11-14	75H-2176	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at BA to replace sn 75H-2150, which was brought back to the lab for calibration.
2020-05-13	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2019-11-13 AGC=100 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=21.6C, Tdew=11.9C Zero Air at 725psi, AMP CA4396 408.97 at 550 Tdewspan=16.00 CO2 zero 0.8675 -> .8672 Offset: -1.42ppm CO2 span 1.0072 -> 1.0081 Offset: -.52ppm H2O zero 0.852 -> .8521 Offset: .8ppm H2O span 0.9123 -> .9159 Offset: -.09ppm Notes:
2020-02-20	75H-2176	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa for calibration. Replaced by sn 0035.
2020-05-13	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2019-11-13 AGC=100 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=21.6C, Tdew=11.9C Zero Air at 725psi, AMP CA4396 408.97 at 550 Tdewspan=16.00 CO2 zero 0.8675 -> .8672 Offset: -1.42ppm CO2 span 1.0072 -> 1.0081 Offset: -.52ppm H2O zero 0.852 -> .8521 Offset: .8ppm H2O span 0.9123 -> .9159 Offset: -.09ppm Notes:
2021-06-09	75H-2176	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Bouldin Alfalfa to replace sn 75H-2669 for calibration.
2021-09-21	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2021-06-07 AGC=100 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=29C, Tdew=11.4C Zero Air at 1550psi, AMP CA04119 524.77 at 1700 Tdewspan=20.00 CO2 zero 0.8673 -> .867 Offset: -1.56ppm CO2 span 1.0067 -> 1.0023 Offset: 3.07ppm H2O zero 0.8536 -> .8526 Offset: -5.5ppm H2O span 0.9148 -> .9091 Offset: .14ppm Notes:
2021-09-15	75H-2176	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa for calibration. Replaced by sn 0035.
2021-09-21	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2021-06-07 AGC=100 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=29C, Tdew=11.4C Zero Air at 1550psi, AMP CA04119 524.77 at 1700 Tdewspan=20.00 CO2 zero 0.8673 -> .867 Offset: -1.56ppm CO2 span 1.0067 -> 1.0023 Offset: 3.07ppm H2O zero 0.8536 -> .8526 Offset: -5.5ppm H2O span 0.9148 -> .9091 Offset: .14ppm Notes:
2022-01-02	75H-2176	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Bouldin Alfalfa to replace sn 75H-2514 for calibration.
2022-04-19	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2021-12-16 AGC=100.6 SDM= DAC1= DAC2= Ambient P=100.9kPa, Tair=24.5C, Tdew=10.5C Zero Air at 700psi, AMP CA04119 524.77 at 1600 Tdewspan=20.00 CO2 zero 0.867 -> .867 Offset: .13ppm CO2 span 1.0045 -> 1.0081 Offset: -2.65ppm H2O zero 0.8546 -> .8557 Offset: 6.7ppm H2O span 0.8249 -> .9228 Offset: .05ppm Notes: Surprisingly large change in H2OSpan's coefficient despite a small offset. Maybe double check this again before deploying.
2022-04-13	75H-2176	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa for calibration. Replaced by sn 1594.
2022-04-19	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2021-12-16 AGC=100.6 SDM= DAC1= DAC2= Ambient P=100.9kPa, Tair=24.5C, Tdew=10.5C Zero Air at 700psi, AMP CA04119 524.77 at 1600 Tdewspan=20.00 CO2 zero 0.867 -> .867 Offset: .13ppm CO2 span 1.0045 -> 1.0081 Offset: -2.65ppm H2O zero 0.8546 -> .8557 Offset: 6.7ppm H2O span 0.8249 -> .9228 Offset: .05ppm Notes: Surprisingly large change in H2OSpan's coefficient despite a small offset. Maybe double check this again before deploying.
2019-04-25	75H-2180	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on Bouldin Alfalfa to replace sn 0035 for calibration
2019-08-21	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2019-04-23 AGC=100.8 SDM=0 DAC1=- DAC2=- Ambient P=100.3kPa, Tair=27.83C, Tdew=15.35C Zero Air at 1000psi, AMP CO2 408.97 at 800 Tdewspan=20.0 CO2 zero 0.9136 -> 0.9137 Offset: 0.45ppm CO2 span 1.0266 -> 1.0266 Offset: -0.02ppm H2O zero 0.8886 -> 0.8884 Offset: -1.3ppm H2O span 1.0236 -> 1.0282 Offset: -0.1ppm Notes:
2019-08-07	75H-2180	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from BA and brought back to the lab for calibration. It was replaced by sn 75H-2150.
2019-08-21	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2019-04-23 AGC=100.8 SDM=0 DAC1=- DAC2=- Ambient P=100.3kPa, Tair=27.83C, Tdew=15.35C Zero Air at 1000psi, AMP CO2 408.97 at 800 Tdewspan=20.0 CO2 zero 0.9136 -> 0.9137 Offset: 0.45ppm CO2 span 1.0266 -> 1.0266 Offset: -0.02ppm H2O zero 0.8886 -> 0.8884 Offset: -1.3ppm H2O span 1.0236 -> 1.0282 Offset: -0.1ppm Notes:
2023-07-24	75H-2180	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Bouldin Alfalfa to replace sn 0035 for calibration.
2023-09-18	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2023-07-19 AGC=100.7 SDM=0 DAC1=- DAC2=- AIU sn AIU-1569, Presure A0=58.004, A1=15.479 Ambient P=100.6kPa, Tair=23.0C, Tdew=14.3C Zero Air at 1750psi, AMP CA04119 524.77 at 1800 Tdewspan=16.0 CO2 zero 0.9143 -> 0.9143 Offset: 0.2ppm CO2 span 1.0374 -> 1.0384 Offset: -0.67ppm H2O zero 0.8941 -> 0.8944 Offset: 2.1ppm H2O span 1.0299 -> 1.0344 Offset: -0.09ppm Notes: This sensor had no mount for bird spikes. Electrical tape that help spikes on left black residue that I removed with Goo-Gone and water and soap. After the CO2 span it was still reading about 0.3 ppm high. This didn't change pushing the calibrate button a second time. I ended up setting the span 0.3ppm less (524.47) and got 524.77. H2O span was really stable.
2023-08-24	75H-2180	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa for mount repair. Replaced by sn 0035.
2023-09-18	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2023-07-19 AGC=100.7 SDM=0 DAC1=- DAC2=- AIU sn AIU-1569, Presure A0=58.004, A1=15.479 Ambient P=100.6kPa, Tair=23.0C, Tdew=14.3C Zero Air at 1750psi, AMP CA04119 524.77 at 1800 Tdewspan=16.0 CO2 zero 0.9143 -> 0.9143 Offset: 0.2ppm CO2 span 1.0374 -> 1.0384 Offset: -0.67ppm H2O zero 0.8941 -> 0.8944 Offset: 2.1ppm H2O span 1.0299 -> 1.0344 Offset: -0.09ppm Notes: This sensor had no mount for bird spikes. Electrical tape that help spikes on left black residue that I removed with Goo-Gone and water and soap. After the CO2 span it was still reading about 0.3 ppm high. This didn't change pushing the calibrate button a second time. I ended up setting the span 0.3ppm less (524.47) and got 524.77. H2O span was really stable.
2020-12-03	75H-2182	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Bouldin Alfalfa to replace sn 0065 for calibration.
2021-05-25	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2020-11-24 AGC=100.1 SDM=0 DAC1=- DAC2=- Ambient P=100.7kPa, Tair=26.2C, Tdew=10.2C Zero Air at 350psi, AMP CA03923 474.19 at 500 Tdewspan=20.0 CO2 zero 0.885 -> 0.8846 Offset: -1.5ppm CO2 span 1.0259 -> 1.0217 Offset: 2.51ppm H2O zero 0.8473 -> 0.8464 Offset: -6.0ppm H2O span 1.0212 -> 1.0240 Offset: -0.05ppm Notes:
2021-03-04	75H-2182	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa and brought back to the lab for calibration. Replaced by sn 75H-2669.
2021-05-25	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2020-11-24 AGC=100.1 SDM=0 DAC1=- DAC2=- Ambient P=100.7kPa, Tair=26.2C, Tdew=10.2C Zero Air at 350psi, AMP CA03923 474.19 at 500 Tdewspan=20.0 CO2 zero 0.885 -> 0.8846 Offset: -1.5ppm CO2 span 1.0259 -> 1.0217 Offset: 2.51ppm H2O zero 0.8473 -> 0.8464 Offset: -6.0ppm H2O span 1.0212 -> 1.0240 Offset: -0.05ppm Notes:
2021-12-14	75H-2514	LI-7500A	Installed	none	Installed at Bouldin Alfalfa to replace sn 0035 for calibration.
2022-01-11	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2021-12-09 AGC=99.8 SDM= DAC1= DAC2= Ambient P=101.8kPa, Tair=27.8C, Tdew=6.5C Zero Air at 1000psi, AMP CA04119 524.77 at 1675 Tdewspan=20.00 CO2 zero 0.9048 -> .9049 Offset: -.47ppm CO2 span 1.0101 -> 1.0047 Offset: 3.73ppm H2O zero 0.8413 -> .8391 Offset: -15.1ppm H2O span 1.0349 -> 1.0087 Offset: .57ppm Notes: Second calibration in a month because there was a big jump of 14ppm CO2 when I installed this sensor at BA on 12/14/2021 and removed sn 0035. I took this sensor off from BA on 1/2/2022 to calibrate again and replaced it with sn75H-2176. This time though the CO2 values were very close, so maybe the problem was actually with sn 0035, not this sensor. However, during this calibration the CO2 span offset was 3.73ppm, which is larger than usual. There was also a large H2O zero offset of -15.1 mmol/m3. I thought about changing its chemicals, but they were just changed a year ago so they're probably ok. I will calibrate it again next week to check.
2022-01-02	75H-2514	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa for calibration check b/c large jump in CO2 when installing it last visit. Replaced by sn 75H-2176.
2022-01-11	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2021-12-09 AGC=99.8 SDM= DAC1= DAC2= Ambient P=101.8kPa, Tair=27.8C, Tdew=6.5C Zero Air at 1000psi, AMP CA04119 524.77 at 1675 Tdewspan=20.00 CO2 zero 0.9048 -> .9049 Offset: -.47ppm CO2 span 1.0101 -> 1.0047 Offset: 3.73ppm H2O zero 0.8413 -> .8391 Offset: -15.1ppm H2O span 1.0349 -> 1.0087 Offset: .57ppm Notes: Second calibration in a month because there was a big jump of 14ppm CO2 when I installed this sensor at BA on 12/14/2021 and removed sn 0035. I took this sensor off from BA on 1/2/2022 to calibrate again and replaced it with sn75H-2176. This time though the CO2 values were very close, so maybe the problem was actually with sn 0035, not this sensor. However, during this calibration the CO2 span offset was 3.73ppm, which is larger than usual. There was also a large H2O zero offset of -15.1 mmol/m3. I thought about changing its chemicals, but they were just changed a year ago so they're probably ok. I will calibrate it again next week to check.
2023-12-22	75H-2514	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Bouldin Alfalfa to replace sn 0035 for calibration.
2024-05-06	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2023-12-20 AGC=100 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.9kPa, Tair=23.3C, Tdew=8.11C Zero Air at 300psi, AMP CA04119 524.77 at 375 Tdewspan=20.00 CO2 zero 0.9095 -> .91 Offset: 1.85ppm CO2 span 1.0207 -> 1.0009 Offset: -.6ppm H2O zero 0.8461 -> .846 Offset: -.5ppm H2O span 0.9962 -> .9936 Offset: .05ppm Notes: From the old configuration file, the CO2 span coefficient was 1.0000. From the database's record of the previous cal on 2023-12-20, the CO2 span coefficient was 1.0207. I used the span coefficient from the old configuration file.
2024-04-16	75H-2514	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa for calibration. Replaced by sn 0065.
2024-05-06	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2023-12-20 AGC=100 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.9kPa, Tair=23.3C, Tdew=8.11C Zero Air at 300psi, AMP CA04119 524.77 at 375 Tdewspan=20.00 CO2 zero 0.9095 -> .91 Offset: 1.85ppm CO2 span 1.0207 -> 1.0009 Offset: -.6ppm H2O zero 0.8461 -> .846 Offset: -.5ppm H2O span 0.9962 -> .9936 Offset: .05ppm Notes: From the old configuration file, the CO2 span coefficient was 1.0000. From the database's record of the previous cal on 2023-12-20, the CO2 span coefficient was 1.0207. I used the span coefficient from the old configuration file.
2016-08-12	75H-2667	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed with the initial set up of the site.
2016-12-19	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2016-08-03 AGC=107.0 SDM=6 DAC1=- DAC2=- Ambient P=101.23kPa, Tair=21.56C, Tdew=-1.32C Zero Air at 300psi, God CO2 421.22 at 400 Tdewspan=16.00 CO2 zero 0.9427 -> 0.9421 Offset: -2.08ppm CO2 span 1.0156 -> 1.0156 Offset: -0.02ppm H2O zero 0.8333 -> 0.8378 Offset: 28.1ppm H2O span 1.015 -> 1.0214 Offset: -0.13ppm Notes:
2016-12-07	75H-2667	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa for calibration. Replaced by sn 0065
2016-12-19	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2016-08-03 AGC=107.0 SDM=6 DAC1=- DAC2=- Ambient P=101.23kPa, Tair=21.56C, Tdew=-1.32C Zero Air at 300psi, God CO2 421.22 at 400 Tdewspan=16.00 CO2 zero 0.9427 -> 0.9421 Offset: -2.08ppm CO2 span 1.0156 -> 1.0156 Offset: -0.02ppm H2O zero 0.8333 -> 0.8378 Offset: 28.1ppm H2O span 1.015 -> 1.0214 Offset: -0.13ppm Notes:
2017-03-23	75H-2667	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Bouldin Alfalfa to replace sn 0065.
2017-08-01	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2017-03-21 AGC=100 SDM= DAC1= DAC2= Ambient P=100.1kPa, Tair=23.2C, Tdew=19.4C Zero Air at 1200psi, LBL Air 408.97 at 2100 Tdewspan=16.00 CO2 zero 0.9423 -> .9443 Offset: 8.88ppm CO2 span 1.0144 -> .9346 Offset: 59.3ppm H2O zero 0.838 -> .8578 Offset: 144.2ppm H2O span 1.0219 -> .9724 Offset: 1.09ppm Notes: Reset signal strength from 113 to 100. H2O at ambient was about 900 mmol/m3, which seems higher than usual. Manually entered in existing coefficients before the calibration because did not have existing config file (usual laptop was elsewhere). Maybe I had entered the coefficients incorrectly in the database?
2017-06-23	75H-2667	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa for calibration; replaced by 75H-0073.
2017-08-01	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2017-03-21 AGC=100 SDM= DAC1= DAC2= Ambient P=100.1kPa, Tair=23.2C, Tdew=19.4C Zero Air at 1200psi, LBL Air 408.97 at 2100 Tdewspan=16.00 CO2 zero 0.9423 -> .9443 Offset: 8.88ppm CO2 span 1.0144 -> .9346 Offset: 59.3ppm H2O zero 0.838 -> .8578 Offset: 144.2ppm H2O span 1.0219 -> .9724 Offset: 1.09ppm Notes: Reset signal strength from 113 to 100. H2O at ambient was about 900 mmol/m3, which seems higher than usual. Manually entered in existing coefficients before the calibration because did not have existing config file (usual laptop was elsewhere). Maybe I had entered the coefficients incorrectly in the database?
2017-12-19	75H-2667	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on Bouldin Alfalfa to replace sn 0042 for calibration
2018-06-25	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2017-12-15 AGC=105.0 SDM=0 DAC1=- DAC2=- Ambient P=100.4kPa, Tair=25.6C, Tdew=12.2C Zero Air at 350psi, AMP 408.97 at 1350 Tdewspan=15.99 CO2 zero 0.9415 -> 0.9414 Offset: -0.3ppm CO2 span 1.0207 -> 1.0162 Offset: 2.28ppm H2O zero 0.8372 -> 0.8375 Offset: 1.8ppm H2O span 1.0166 -> 1.0237 Offset: -0.15ppm Notes: Calibrated by Joe
2018-04-05	75H-2667	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from BA and brought back to the lab for calibration. It was replaced by sn 0065.
2018-06-25	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2017-12-15 AGC=105.0 SDM=0 DAC1=- DAC2=- Ambient P=100.4kPa, Tair=25.6C, Tdew=12.2C Zero Air at 350psi, AMP 408.97 at 1350 Tdewspan=15.99 CO2 zero 0.9415 -> 0.9414 Offset: -0.3ppm CO2 span 1.0207 -> 1.0162 Offset: 2.28ppm H2O zero 0.8372 -> 0.8375 Offset: 1.8ppm H2O span 1.0166 -> 1.0237 Offset: -0.15ppm Notes: Calibrated by Joe
2018-10-18	75H-2667	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on Bouldin Alfalfa to replace sn 74H-2150 for calibration.
2019-02-11	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2018-10-10 AGC=104 SDM=0 DAC1=0 DAC2=0 Ambient P=101.2kPa, Tair=25.1C, Tdew=2.5C Zero Air at 1175psi, AMP Air 408.97 at 800 Tdewspan=16.00 CO2 zero 0.9412 -> .9425 Offset: 4.87ppm CO2 span 1.0145 -> 1.0143 Offset: 0.15ppm H2O zero 0.8367 -> .8349 Offset: -11.1ppm H2O span 1.0218 -> 1.0222 Offset: -.01ppm Notes: Spanned at "15.99C" in 7550 software with dewpt generator set at 16.00.
2019-01-31	75H-2667	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from BA and brought back to the lab for calibration. It was replaced by sn 0035.
2019-02-11	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2018-10-10 AGC=104 SDM=0 DAC1=0 DAC2=0 Ambient P=101.2kPa, Tair=25.1C, Tdew=2.5C Zero Air at 1175psi, AMP Air 408.97 at 800 Tdewspan=16.00 CO2 zero 0.9412 -> .9425 Offset: 4.87ppm CO2 span 1.0145 -> 1.0143 Offset: 0.15ppm H2O zero 0.8367 -> .8349 Offset: -11.1ppm H2O span 1.0218 -> 1.0222 Offset: -.01ppm Notes: Spanned at "15.99C" in 7550 software with dewpt generator set at 16.00.
2020-05-19	75H-2667	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Bouldin Alfalfa to replace sn 0035 for calibration.
2020-08-25	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2020-05-13 AGC=101.7 SDM=0 DAC1=- DAC2=- Ambient P=100.2kPa, Tair=24.1C, Tdew=15.3C Zero Air at 650psi, AMP CA04396 408.97 at 450 Tdewspan=20.0 CO2 zero 0.9422 -> 0.9420 Offset: -0.9ppm CO2 span 1.0196 -> 1.0172 Offset: 1.23ppm H2O zero 0.838 -> 0.8403 Offset: 14ppm H2O span 1.0313 -> 1.0244 Offset: 0.2ppm Notes: Larger than usual offset in H2O zero
2020-08-21	75H-2667	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from BA for calibration. Replaced by sn 0065.
2020-08-25	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2020-05-13 AGC=101.7 SDM=0 DAC1=- DAC2=- Ambient P=100.2kPa, Tair=24.1C, Tdew=15.3C Zero Air at 650psi, AMP CA04396 408.97 at 450 Tdewspan=20.0 CO2 zero 0.9422 -> 0.9420 Offset: -0.9ppm CO2 span 1.0196 -> 1.0172 Offset: 1.23ppm H2O zero 0.838 -> 0.8403 Offset: 14ppm H2O span 1.0313 -> 1.0244 Offset: 0.2ppm Notes: Larger than usual offset in H2O zero
2024-07-22	75H-2667	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Bouldin Alfalfa to replace sn 0065 for calibration.
2025-01-07	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2024-07-19 AGC=98.8 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=101.0kPa, Tair=25.9C, Tdew=2.99C Zero Air at 900psi, AMP FB04319 514.07 at 400 Tdewspan=20.00 CO2 zero 0.9416 -> .9410 Offset: -2.32ppm CO2 span 1.0177 -> 1.0165 Offset: .64ppm H2O zero 0.8407 -> .8454 Offset: 29.2ppm H2O span 1.0371 -> 1.0393 Offset: -.04ppm Notes: Larger H2O zero offset (29.2 mmol/m3) than usual, but it was offset by the offset from the previous calibration (-20.2 mmol/m3). There is a consistent drift in the H2O zero coefficient since 2023. I don't think the chemicals have been swapped since 2016, so I could do that next time. Used "514.03" as CO2 span point in the 7550 software.
2024-11-06	75H-2667	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa for calibration. Replaced by sn 0073.
2025-01-07	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2024-07-19 AGC=98.8 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=101.0kPa, Tair=25.9C, Tdew=2.99C Zero Air at 900psi, AMP FB04319 514.07 at 400 Tdewspan=20.00 CO2 zero 0.9416 -> .9410 Offset: -2.32ppm CO2 span 1.0177 -> 1.0165 Offset: .64ppm H2O zero 0.8407 -> .8454 Offset: 29.2ppm H2O span 1.0371 -> 1.0393 Offset: -.04ppm Notes: Larger H2O zero offset (29.2 mmol/m3) than usual, but it was offset by the offset from the previous calibration (-20.2 mmol/m3). There is a consistent drift in the H2O zero coefficient since 2023. I don't think the chemicals have been swapped since 2016, so I could do that next time. Used "514.03" as CO2 span point in the 7550 software.
2021-03-04	75H-2669	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at Bouldin Alfalfa to replace sn 75H-2182 for calibration.
2021-08-31	75H-2669	LI-7500A	Calibration	Lab	Last calibration: 2021-03-01 AGC=100.8 SDM=0 DAC1=- DAC2=- Ambient P=99.7kPa, Tair=26.2C, Tdew=13.6C Zero Air at 1800psi, AMP CA04119 524.77 at 1700 Tdewspan=20.0 CO2 zero 0.919 -> 0.9188 Offset: -0.85ppm CO2 span 1.0059 -> 1.0127 Offset: -4.77ppm H2O zero 0.8984 -> 0.9005 Offset: 13.3ppm H2O span 1.0033 -> 1.0086 Offset: -0.12ppm Notes:
2021-06-09	75H-2669	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from Bouldin Alfalfa for calibration. Replaced by sn 75H-2176.
2021-08-31	75H-2669	LI-7500A	Calibration	Lab	Last calibration: 2021-03-01 AGC=100.8 SDM=0 DAC1=- DAC2=- Ambient P=99.7kPa, Tair=26.2C, Tdew=13.6C Zero Air at 1800psi, AMP CA04119 524.77 at 1700 Tdewspan=20.0 CO2 zero 0.919 -> 0.9188 Offset: -0.85ppm CO2 span 1.0059 -> 1.0127 Offset: -4.77ppm H2O zero 0.8984 -> 0.9005 Offset: 13.3ppm H2O span 1.0033 -> 1.0086 Offset: -0.12ppm Notes:
2025-01-30	75H-2669	LI-7500A	Installed	none	Installed at Bouldin Alfalfa to replace sn 0073 for calibration.
2021-04-15	TG1-0155	LI-7700	Installed	Gas Analyzer CH4	Installed on the BA tower after factory repair/calibration.
2021-12-01	TG1-0155	LI-7700	Calibration		Calibration Location: Bouldin Alfalfa Last calibration: 2021-05-10 RSSI=84%, Optical RH=3% Ambient P=101.7kPa, Tair=21.4C Zero Air at 1050psi, AMP CA04396 1.9317 at 1700 CH4 Zero Offset: .022ppm CH4 Span Offset: -.0087ppm Notes: Relatively still day. Zero air tank pressure uncertain--wonky regulator.
2022-04-13	TG1-0155	LI-7700	Removed	Gas Analyzer CH4	Removed from Bouldin Alfalfa and brought back to the lab because we will use it to replace the faulty one from WP. I removed the power cable as well since the WP power cable could be bad. The wash power, wash tubing, and Ethernet cable are still there.
2020-11-19	TG1-0211	LI-7700	Installed	Gas Analyzer CH4	Installed at Bouldin Alfalfa to replace sn TG1-0421 for calibration.
2021-03-11	TG1-0211	LI-7700	Moved	Gas Analyzer CH4	Installed at Hill Slough with site setup. This sensor was removed from BA because our spare 7700 is currently at the factory.
2017-10-19	TG1-0223	LI-7700	Installed	Gas Analyzer CH4	Installed at BA (now that the East End temporary towers are done, we have an available LI-7700 to put up here)
2018-04-19	TG1-0223	LI-7700	Removed	Gas Analyzer CH4	Removed from Bouldin Alfalfa for calibration. Replaced by sn TG1-0424
2016-08-12	TG1-0421	LI-7700	Installed	Gas Analyzer CH4	Installed with the initial set up of the site.
2017-03-23	TG1-0421	LI-7700	Removed	Gas Analyzer CH4	Removed from Bouldin Alfalfa and brought back to the lab for calibration. It was replaced by TG1-0424.
2018-11-07	TG1-0421	LI-7700	Installed	Gas Analyzer CH4	Installed at BA. The previous LI-7700 sn TG1-0424 was removed for a power board swap.
2019-02-12	TG1-0421	LI-7700	Tested	Gas Analyzer CH4	Tried to upgrade firmware from 1.0.23 to 1.0.27, but there was an error, "Fatal: Network Error: Connection Timed out."
2019-04-11	TG1-0421	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: Bouldin Alfalfa Last calibration: 2018-11-06 RSSI=83%, Optical RH=17% Ambient P=101.3kPa, Tair=19.2C Zero Air M4002 at 1600psi, AMP CA03923 3.121 at 1600 CH4 Zero Offset: 0.037ppm CH4 Span Offset: 0.007ppm Notes: Breezy day, upgraded firmware from v1.0.23 to v1.0.27 before calibration
2019-04-11	TG1-0421	LI-7700	Upgrade	Gas Analyzer CH4	Upgraded LI-7700 sn TG1-0421 firmware from 1.0.23 to 1.0.27. To connect, Joe had to change the laptop network subnet from 192.168.2.5 to 192.168.1.5 (to match the LI-7700 IP address of 192.168.1.77), even though the subnet mask was 255.255.255.0. We then restarted the instrument and calibrated LI-7700 sn TG1-0421.
2019-10-22	TG1-0421	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: Bouldin Alfalfa Last calibration: 2019-04-11 RSSI=84%, Optical RH=22% Ambient P=101.8kPa, Tair=20.9C Zero Air at 1300psi, AMP CA03923 3.121 at 1400 CH4 Zero Offset: 0.022ppm CH4 Span Offset: 0.001ppm Notes: Swapped optics desiccant after calibration using cal gas to dry head space. New RH 7%
2020-05-19	TG1-0421	LI-7700	Calibration		Calibration Location: Bouldin Alfalfa Last calibration: 2019-10-22 RSSI=76%, Optical RH=4% Ambient P=101.2kPa, Tair=19.0C Zero Air at 900psi, AMP CA3923 3.121 at 975 CH4 Zero Offset: -0.082ppm CH4 Span Offset: 0.004ppm Notes: Breezy day
2020-11-19	TG1-0421	LI-7700	Moved	Gas Analyzer CH4	Removed from Bouldin Alfalfa for calibration. Replaced by sn TG1-0211. Later we discovered that the 7700 at WP was behaving weirdly so we swapped this instrument in there are calibrated it there.
2017-03-23	TG1-0424	LI-7700	Installed	Gas Analyzer CH4	Installed at Bouldin Alfalfa to replace TG1-0421.
2017-06-23	TG1-0424	LI-7700	Installed	Gas Analyzer CH4	Moved from Bouldin Alfalfa to be installed at the East End Temporary Tower #3 Boardwalk location with the initial setup of the site.
2018-04-19	TG1-0424	LI-7700	Installed	Gas Analyzer CH4	Installed on Bouldin Alfalfa to replace sn TG1-0223 for calibration
2018-10-18	TG1-0424	LI-7700	Removed	Gas Analyzer CH4	Removed from Bouldin Alfalfa for power board upgrade and to swap in for other two 7700s needing upgrade.

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