Equipment and Calibration

Equipment history at West Pond

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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
2022-01-20	0035	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at West Pond to replace sn 75H-2150 for calibration.
2022-04-19	0035	LI-7500A	Calibration	Lab	Last calibration: 2022-01-11 AGC=99.4 SDM= DAC1= DAC2= Ambient P=100.7kPa, Tair=25.4C, Tdew=8.2C Zero Air at 650psi, AMP CA04119 524.77 at 1600 Tdewspan=20.00 CO2 zero 0.9372 -> .9372 Offset: -.09ppm CO2 span 1.0128 -> 1.0167 Offset: -2.67ppm H2O zero 0.8986 -> .8983 Offset: -2.2ppm H2O span 1.0282 -> 1.0310 Offset: -.06ppm Notes:
2022-04-13	0035	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from West Pond for calibration and brought back to the lab. Replaced by sn 0073.
2022-04-19	0035	LI-7500A	Calibration	Lab	Last calibration: 2022-01-11 AGC=99.4 SDM= DAC1= DAC2= Ambient P=100.7kPa, Tair=25.4C, Tdew=8.2C Zero Air at 650psi, AMP CA04119 524.77 at 1600 Tdewspan=20.00 CO2 zero 0.9372 -> .9372 Offset: -.09ppm CO2 span 1.0128 -> 1.0167 Offset: -2.67ppm H2O zero 0.8986 -> .8983 Offset: -2.2ppm H2O span 1.0282 -> 1.0310 Offset: -.06ppm Notes:
2022-09-15	0035	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at West Pond to replace sn 0073 for calibration.
2023-01-13	0035	LI-7500A	Calibration	Lab	Last calibration: 2022-08-25 AGC=99.4 SDM= DAC1= DAC2= Ambient P=100.4kPa, Tair=18.8C, Tdew=11.5C Zero Air at 1625psi, AMP CA04119 524.77 at 1275 Tdewspan=16.00 CO2 zero 0.9374 -> .9374 Offset: .2ppm CO2 span 1.0234 -> 1.0295 Offset: -3.97ppm H2O zero 0.8995 -> .9003 Offset: 4.9ppm H2O span 1.0334 -> 1.0369 Offset: -.06ppm Notes: Setting the CO2 span to 524.77ppm seemed to force the value to ~524.85 instead of 524.77. I think it's ok for now but something to keep an eye on. H2O value was not stabilizing when dewpt generator was set to 20.00C, probably because the room's dewpt<20.00C. I set the span point to 16.00C instead, which worked well.
2023-01-06	0035	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from West Pond for calibration. Replaced by sn 0065.
2023-01-13	0035	LI-7500A	Calibration	Lab	Last calibration: 2022-08-25 AGC=99.4 SDM= DAC1= DAC2= Ambient P=100.4kPa, Tair=18.8C, Tdew=11.5C Zero Air at 1625psi, AMP CA04119 524.77 at 1275 Tdewspan=16.00 CO2 zero 0.9374 -> .9374 Offset: .2ppm CO2 span 1.0234 -> 1.0295 Offset: -3.97ppm H2O zero 0.8995 -> .9003 Offset: 4.9ppm H2O span 1.0334 -> 1.0369 Offset: -.06ppm Notes: Setting the CO2 span to 524.77ppm seemed to force the value to ~524.85 instead of 524.77. I think it's ok for now but something to keep an eye on. H2O value was not stabilizing when dewpt generator was set to 20.00C, probably because the room's dewpt<20.00C. I set the span point to 16.00C instead, which worked well.
2020-05-19	0041	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at West Pond to replace sn 0418 for calibration.
2020-08-25	0041	LI-7500A	Calibration	Lab	Last calibration: 2020-05-13 AGC=100.5 SDM=0 DAC1=- DAC2=- Ambient P=100.2kPa, Tair=23.1C, Tdew=14.1C Zero Air at 700psi, AMP CA04396 408.97 at 500 Tdewspan=20.0 CO2 zero 0.9966 -> 0.9964 Offset: -0.7ppm CO2 span 1.018 -> 1.0173 Offset: 0.43ppm H2O zero 0.821 -> 0.8216 Offset: 3.3ppm H2O span 1.0256 -> 1.0323 Offset: -0.05ppm Notes:
2020-08-21	0041	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from West Pond for calibration. Replaced by sn 75H-2150.
2020-08-25	0041	LI-7500A	Calibration	Lab	Last calibration: 2020-05-13 AGC=100.5 SDM=0 DAC1=- DAC2=- Ambient P=100.2kPa, Tair=23.1C, Tdew=14.1C Zero Air at 700psi, AMP CA04396 408.97 at 500 Tdewspan=20.0 CO2 zero 0.9966 -> 0.9964 Offset: -0.7ppm CO2 span 1.018 -> 1.0173 Offset: 0.43ppm H2O zero 0.821 -> 0.8216 Offset: 3.3ppm H2O span 1.0256 -> 1.0323 Offset: -0.05ppm Notes:
2018-07-12	0042	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at WP to replace sn 75H-2514, which was brought back to the lab for calibration.
2019-01-02	0042	LI-7500A	Calibration	Lab	Last calibration: 2018-07-10 AGC=98.7 SDM=0 DAC1=0 DAC2=0 Ambient P=101.3kPa, Tair=19.2C, Tdew=.7C Zero Air at 1400psi, AMP Air 408.97 at 875 Tdewspan=16.00 CO2 zero 0.9485 -> .9489 Offset: 1.45ppm CO2 span 1.0039 -> 1.0187 Offset: -7.39ppm H2O zero 0.8406 -> .8434 Offset: 18.2ppm H2O span 1.0158 -> 1.0334 Offset: -.37ppm Notes: Dewpoint generator was set at 16.03C and I adjusted it to 16.00 before beginning calibration. H2O zero offset larger than I expected, but H2O span seems fine.
2018-10-25	0042	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from WP and brought back to the lab for calibration. it was replaced by sn 75H-2182.
2019-01-02	0042	LI-7500A	Calibration	Lab	Last calibration: 2018-07-10 AGC=98.7 SDM=0 DAC1=0 DAC2=0 Ambient P=101.3kPa, Tair=19.2C, Tdew=.7C Zero Air at 1400psi, AMP Air 408.97 at 875 Tdewspan=16.00 CO2 zero 0.9485 -> .9489 Offset: 1.45ppm CO2 span 1.0039 -> 1.0187 Offset: -7.39ppm H2O zero 0.8406 -> .8434 Offset: 18.2ppm H2O span 1.0158 -> 1.0334 Offset: -.37ppm Notes: Dewpoint generator was set at 16.03C and I adjusted it to 16.00 before beginning calibration. H2O zero offset larger than I expected, but H2O span seems fine.
2020-12-03	0042	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at West Pond to replace sn 75H-2150 for calibration.
2021-05-25	0042	LI-7500A	Calibration	Lab	Last calibration: 2020-12-02 AGC=99.5 SDM=0 DAC1=- DAC2=- Ambient P=100.7kPa, Tair=26.2C, Tdew=10.8C Zero Air at 350psi, AMP CA03923 474.19 at 500 Tdewspan=20.0 CO2 zero 0.9482 -> 0.9481 Offset: -0.4ppm CO2 span 1.0111 -> 1.0041 Offset: 4.31ppm H2O zero 0.8436 -> 0.8437 Offset: 0.7ppm H2O span 1.0264 -> 1.0149 Offset: 0.3ppm Notes:
2021-03-16	0042	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from West Pond for calibration and brought back to the lab. Replaced by sn 0073.
2021-05-25	0042	LI-7500A	Calibration	Lab	Last calibration: 2020-12-02 AGC=99.5 SDM=0 DAC1=- DAC2=- Ambient P=100.7kPa, Tair=26.2C, Tdew=10.8C Zero Air at 350psi, AMP CA03923 474.19 at 500 Tdewspan=20.0 CO2 zero 0.9482 -> 0.9481 Offset: -0.4ppm CO2 span 1.0111 -> 1.0041 Offset: 4.31ppm H2O zero 0.8436 -> 0.8437 Offset: 0.7ppm H2O span 1.0264 -> 1.0149 Offset: 0.3ppm Notes:
2013-01-03	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the West Pond tower with AIU-0666 to swap out sn 2182 for calibration and AIU-0397 for repair of the condensation problem.
2013-05-08	0065	LI-7500A	Calibration	Lab	Last calibration: 2012-12-13 AGC=15.5 SDM=1 DAC1=none DAC2=none Ambient P=101.55kPa, Tair=23.16C, Tdew=10.26C Zero air at 1700psi, God bottle 421.22 at 1700 Tdewspan=15.03 CO2 zero 0.8901 -> 0.8904 Offset: 0.90ppm CO2 span 1.001 -> 1.0198 Offset: -10.07ppm H2O zero 0.7016 -> 0.7022 Offset: 4.2ppm H2O span 0.9935 -> 0.9726 Offset: 0.44ppm Notes: Secondary CO2 standard seemed low at 344.62. I rechecked it with the LI6262 and got even lower value about 337. I calibrated with the god bottle but the IGRA was still off about 10ppm. I double checked the secondary standard and it read 335 - okay.
2013-04-26	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the West Pond tower for calibration. Replaced by sn2176
2013-05-08	0065	LI-7500A	Calibration	Lab	Last calibration: 2012-12-13 AGC=15.5 SDM=1 DAC1=none DAC2=none Ambient P=101.55kPa, Tair=23.16C, Tdew=10.26C Zero air at 1700psi, God bottle 421.22 at 1700 Tdewspan=15.03 CO2 zero 0.8901 -> 0.8904 Offset: 0.90ppm CO2 span 1.001 -> 1.0198 Offset: -10.07ppm H2O zero 0.7016 -> 0.7022 Offset: 4.2ppm H2O span 0.9935 -> 0.9726 Offset: 0.44ppm Notes: Secondary CO2 standard seemed low at 344.62. I rechecked it with the LI6262 and got even lower value about 337. I calibrated with the god bottle but the IGRA was still off about 10ppm. I double checked the secondary standard and it read 335 - okay.
2014-04-03	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the West Pond tower to replace sn 74H-2150 from calibration.
2014-09-09	0065	LI-7500A	Calibration	Lab	Last calibration: 2014-04-02 AGC=73.73 SDM=1 DAC1=- DAC2=- Ambient P=100.35kPa, Tair=22.06C, Tdew=12.61C Zero Air at 1000psi, God CO2 421.22 at 1300 Tdewspan=15.25 CO2 zero 0.8899 -> 0.8899 Offset: 0.0ppm CO2 span 1.0062 -> 1.0070 Offset: -0.52ppm H2O zero 0.704 -> 0.7053 Offset: 8.6ppm H2O span 0.9932 -> 1.0101 Offset: -0.34ppm Notes:
2014-09-04	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed for calibration. Problems with the 7550 box sn AIU-0614 prevented installation of a new 7500.
2014-09-09	0065	LI-7500A	Calibration	Lab	Last calibration: 2014-04-02 AGC=73.73 SDM=1 DAC1=- DAC2=- Ambient P=100.35kPa, Tair=22.06C, Tdew=12.61C Zero Air at 1000psi, God CO2 421.22 at 1300 Tdewspan=15.25 CO2 zero 0.8899 -> 0.8899 Offset: 0.0ppm CO2 span 1.0062 -> 1.0070 Offset: -0.52ppm H2O zero 0.704 -> 0.7053 Offset: 8.6ppm H2O span 0.9932 -> 1.0101 Offset: -0.34ppm Notes:
2015-12-08	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the West Pond tower to replace sn 75H-2180 for calibration.
2016-05-13	0065	LI-7500A	Calibration	Lab	Last calibration: 2015-12-07 AGC=74.96 SDM=- DAC1=- DAC2=- Ambient P=100.14kPa, Tair=20.14C, Tdew=8.2C Zero Air at 600psi, God CO2 421.22 at 500 Tdewspan=15.09 CO2 zero 0.89 -> 0.8898 Offset: -0.57ppm CO2 span 1.0164 -> 1.0149 Offset: 0.91ppm H2O zero 0.7097 -> 0.7086 Offset: -7.4ppm H2O span 1.0231 -> 1.0139 Offset: 0.19ppm Notes: Calibration from H2O performed at 15.09C dew point instead of 11.09 which has been used previously. Use 15.09 from now on for a larger calibrated H2O range.
2016-02-25	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the West Pond tower for calibration. Replaced by sn 1594.
2016-05-13	0065	LI-7500A	Calibration	Lab	Last calibration: 2015-12-07 AGC=74.96 SDM=- DAC1=- DAC2=- Ambient P=100.14kPa, Tair=20.14C, Tdew=8.2C Zero Air at 600psi, God CO2 421.22 at 500 Tdewspan=15.09 CO2 zero 0.89 -> 0.8898 Offset: -0.57ppm CO2 span 1.0164 -> 1.0149 Offset: 0.91ppm H2O zero 0.7097 -> 0.7086 Offset: -7.4ppm H2O span 1.0231 -> 1.0139 Offset: 0.19ppm Notes: Calibration from H2O performed at 15.09C dew point instead of 11.09 which has been used previously. Use 15.09 from now on for a larger calibrated H2O range.
2023-01-06	0065	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at West Pond to replace sn 0035 for calibration.
2023-04-10	0065	LI-7500A	Calibration	Lab	Last calibration: 2023-01-04 AGC=102 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=23.7C, Tdew=10.5C Zero Air at 1300psi, AMP CA04119 524.77 at 1150 Tdewspan=16.00 CO2 zero 0.8915 -> .8918 Offset: 1.72ppm CO2 span 1.0227 -> 1.0217 Offset: .83ppm H2O zero 0.7323 -> .7295 Offset: -20.4ppm H2O span 1.0226 -> 1.0128 Offset: .21ppm Notes:
2023-04-03	0065	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from West Pond for calibration. Replaced by sn 75H-2180.
2023-04-10	0065	LI-7500A	Calibration	Lab	Last calibration: 2023-01-04 AGC=102 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=23.7C, Tdew=10.5C Zero Air at 1300psi, AMP CA04119 524.77 at 1150 Tdewspan=16.00 CO2 zero 0.8915 -> .8918 Offset: 1.72ppm CO2 span 1.0227 -> 1.0217 Offset: .83ppm H2O zero 0.7323 -> .7295 Offset: -20.4ppm H2O span 1.0226 -> 1.0128 Offset: .21ppm Notes:
2021-03-16	0073	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at West Pond to replace sn 0042 for calibration.
2021-06-01	0073	LI-7500A	Calibration	Lab	Last calibration: 2021-03-15 AGC=99.0 SDM=0 DAC1=- DAC2=- Ambient P=100.4kPa, Tair=22.0C, Tdew=10.9C Zero Air at 300psi, AMP CA04119 524.77 at 1800 Tdewspan=16.0 CO2 zero 0.957 -> 0.9568 Offset: -0.6ppm CO2 span 1.0077 -> 1.0071 Offset: 0.43ppm H2O zero 0.7324 -> 0.7324 Offset: 2.2ppm H2O span 1.0024 -> 1.0037 Offset: -0.03ppm Notes: I started to calibrate this IRGA and I thought the signals looked noisy. At first I thought it might be a problem the the zero air flow rate and upped that a bit but no change. Then I calibrated sn 0418 and it seemed normal. I did a full calibration and while the numbers are pretty much right on all CO2, H2O zero and span were more noisy than usual. Don't deploy this one until some further checking is done.
2021-05-26	0073	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from West Pond for calibration. Replaced by sn 75H-2182.
2021-06-01	0073	LI-7500A	Calibration	Lab	Last calibration: 2021-03-15 AGC=99.0 SDM=0 DAC1=- DAC2=- Ambient P=100.4kPa, Tair=22.0C, Tdew=10.9C Zero Air at 300psi, AMP CA04119 524.77 at 1800 Tdewspan=16.0 CO2 zero 0.957 -> 0.9568 Offset: -0.6ppm CO2 span 1.0077 -> 1.0071 Offset: 0.43ppm H2O zero 0.7324 -> 0.7324 Offset: 2.2ppm H2O span 1.0024 -> 1.0037 Offset: -0.03ppm Notes: I started to calibrate this IRGA and I thought the signals looked noisy. At first I thought it might be a problem the the zero air flow rate and upped that a bit but no change. Then I calibrated sn 0418 and it seemed normal. I did a full calibration and while the numbers are pretty much right on all CO2, H2O zero and span were more noisy than usual. Don't deploy this one until some further checking is done.
2022-04-13	0073	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at West Pond to replace sn 0035 for calibration.
2022-11-15	0073	LI-7500A	Calibration	Lab	Last calibration: 2022-04-08 AGC=101.2 SDM= DAC1= DAC2= Ambient P=101.2kPa, Tair=23.2C, Tdew=1.69C Zero Air at 1850psi, AMP CA04119 524.77 at 1350 Tdewspan=20.00 CO2 zero 0.9163 -> .9165 Offset: .68ppm CO2 span 0.9983 -> 1.0085 Offset: -7.22ppm H2O zero 0.8246 -> .8296 Offset: 28.9ppm H2O span 1.0147 -> 1.0258 Offset: -.25ppm Notes: Used AMP LI-7550 sn AIU-1039
2022-09-15	0073	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from West Pond for calibration. Replaced by sn 0035.
2022-11-15	0073	LI-7500A	Calibration	Lab	Last calibration: 2022-04-08 AGC=101.2 SDM= DAC1= DAC2= Ambient P=101.2kPa, Tair=23.2C, Tdew=1.69C Zero Air at 1850psi, AMP CA04119 524.77 at 1350 Tdewspan=20.00 CO2 zero 0.9163 -> .9165 Offset: .68ppm CO2 span 0.9983 -> 1.0085 Offset: -7.22ppm H2O zero 0.8246 -> .8296 Offset: 28.9ppm H2O span 1.0147 -> 1.0258 Offset: -.25ppm Notes: Used AMP LI-7550 sn AIU-1039
2017-07-03	0418	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at West Pond to replace 75H-2668.
2017-11-27	0418	LI-7500A	Calibration	Lab	Last calibration: 2017-07-02 AGC=97.1 SDM=0 DAC1=0 DAC2=0 Ambient P=100.9kPa, Tair=22.8C, Tdew=6.8C Zero Air at 350psi, LBL Air 408.97 at 1750 Tdewspan=16.00 CO2 zero 0.8995 -> .8998 Offset: .87ppm CO2 span 1.0066 -> 1.006 Offset: .4ppm H2O zero 0.8436 -> .8437 Offset: .2ppm H2O span 0.9847 -> .9821 Offset: .05ppm Notes: Calibrated on 7550 software version 8.5.0
2017-10-13	0418	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from West Pond for calibration. Replaced by sn 75H-2150
2017-11-27	0418	LI-7500A	Calibration	Lab	Last calibration: 2017-07-02 AGC=97.1 SDM=0 DAC1=0 DAC2=0 Ambient P=100.9kPa, Tair=22.8C, Tdew=6.8C Zero Air at 350psi, LBL Air 408.97 at 1750 Tdewspan=16.00 CO2 zero 0.8995 -> .8998 Offset: .87ppm CO2 span 1.0066 -> 1.006 Offset: .4ppm H2O zero 0.8436 -> .8437 Offset: .2ppm H2O span 0.9847 -> .9821 Offset: .05ppm Notes: Calibrated on 7550 software version 8.5.0
2019-04-25	0418	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on West Pond to replace sn 75H-2668 for calibartion
2019-08-21	0418	LI-7500A	Calibration	Lab	Last calibration: 2019-04-22 AGC=93.7 SDM=0 DAC1=- DAC2=- Ambient P=100.3kPa, Tair=26.98C, Tdew=14.83C Zero Air at 1000psi, AMP CO2 408.97 at 800 Tdewspan=20.0 CO2 zero 0.8992 -> 0.8990 Offset: -0.55ppm CO2 span 1.0011 -> 0.9976 Offset: 1.71ppm H2O zero 0.8464 -> 0.8466 Offset: -0.8ppm H2O span 0.9866 -> 0.9818 Offset: 0.11ppm Notes:
2019-08-07	0418	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from WP and brought back to the lab for calibration. It was replaced by sn 75H-2182.
2019-08-21	0418	LI-7500A	Calibration	Lab	Last calibration: 2019-04-22 AGC=93.7 SDM=0 DAC1=- DAC2=- Ambient P=100.3kPa, Tair=26.98C, Tdew=14.83C Zero Air at 1000psi, AMP CO2 408.97 at 800 Tdewspan=20.0 CO2 zero 0.8992 -> 0.8990 Offset: -0.55ppm CO2 span 1.0011 -> 0.9976 Offset: 1.71ppm H2O zero 0.8464 -> 0.8466 Offset: -0.8ppm H2O span 0.9866 -> 0.9818 Offset: 0.11ppm Notes:
2020-02-20	0418	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at West Pond to replace sn 75H-2667 for calibration.
2020-05-20	0418	LI-7500A	Calibration	Lab	Last calibration: 2020-02-19 AGC=94.4 SDM=0 DAC1=- DAC2=- Ambient P=100.9kPa, Tair=21.0C, Tdew=10.0C Zero Air at 800psi, AMP CA04396 408.97 at 600 Tdewspan=16.0 CO2 zero 0.8994 -> 0.8992 Offset: -0.8ppm CO2 span 0.9987 -> 0.9991 Offset: -0.27ppm H2O zero 0.8456 -> 0.8462 Offset: 3.3ppm H2O span 0.9845 -> 0.9764 Offset: 0.2ppm Notes:
2020-05-19	0418	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from West Pond and brought back to the lab for calibration. Replaced by sn 0041.
2020-05-20	0418	LI-7500A	Calibration	Lab	Last calibration: 2020-02-19 AGC=94.4 SDM=0 DAC1=- DAC2=- Ambient P=100.9kPa, Tair=21.0C, Tdew=10.0C Zero Air at 800psi, AMP CA04396 408.97 at 600 Tdewspan=16.0 CO2 zero 0.8994 -> 0.8992 Offset: -0.8ppm CO2 span 0.9987 -> 0.9991 Offset: -0.27ppm H2O zero 0.8456 -> 0.8462 Offset: 3.3ppm H2O span 0.9845 -> 0.9764 Offset: 0.2ppm Notes:
2016-02-25	1594	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the West Pond tower to replace sn 0065 for calibration
2016-06-06	1594	LI-7500A	Removed	Gas Analyzer CO2/H2O	removed from west pond for calibration, replaced by sn 75H-2176
2023-10-04	1594	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at West Pond to replace sn 75H-2514, which needs to go back to the factory for RMA (PLL error, CO2 and H2O were both 0).
2024-01-04	1594	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from WP tower with initial decommissioning of the site
2013-12-19	75H-2150	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the West Pond Tower to replace sn 75H-2182 for calibration.
2014-06-24	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2013-12-18 AGC=95.08 SDM=1 DAC1=- DAC2=- Ambient P=100.15kPa, Tair=21.78C, Tdew=11.81C Zero Air at 1200psi, God CO2 421.22 at 1500 Tdewspan=15.26 CO2 zero 0.9012 -> 0.9012 Offset: 0.07ppm CO2 span 1.0016 -> 1.0011 Offset: 0.28ppm H2O zero 0.8643 -> 0.8652 Offset: 5.8ppm H2O span 0.9987 -> 1.0087 Offset: -0.21ppm Notes:
2014-04-03	75H-2150	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from West Pond for calibration. Replaced by sn 0065.
2014-06-24	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2013-12-18 AGC=95.08 SDM=1 DAC1=- DAC2=- Ambient P=100.15kPa, Tair=21.78C, Tdew=11.81C Zero Air at 1200psi, God CO2 421.22 at 1500 Tdewspan=15.26 CO2 zero 0.9012 -> 0.9012 Offset: 0.07ppm CO2 span 1.0016 -> 1.0011 Offset: 0.28ppm H2O zero 0.8643 -> 0.8652 Offset: 5.8ppm H2O span 0.9987 -> 1.0087 Offset: -0.21ppm Notes:
2016-09-13	75H-2150	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at West Pond after calibration. Replacing 75H-2176.
2017-03-14	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2016-09-12 AGC=98.7 SDM= DAC1= DAC2= Ambient P=100.4kPa, Tair=27.5C, Tdew=10.12C Zero Air at 1700psi, God CO2 421.22 at 400 Tdewspan=16.00 CO2 zero 0.9019 -> 0.9014 Offset: -2.03ppm CO2 span 1.0084 -> 1.0000 Offset: 4.31ppm H2O zero 0.8662 -> 0.8651 Offset: -6.8ppm H2O span 1.0155 -> 1.0094 Offset: 0.13ppm Notes:
2016-12-21	75H-2150	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from West Pond for calibration in the lab. Replaced by 75H-2267
2017-03-14	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2016-09-12 AGC=98.7 SDM= DAC1= DAC2= Ambient P=100.4kPa, Tair=27.5C, Tdew=10.12C Zero Air at 1700psi, God CO2 421.22 at 400 Tdewspan=16.00 CO2 zero 0.9019 -> 0.9014 Offset: -2.03ppm CO2 span 1.0084 -> 1.0000 Offset: 4.31ppm H2O zero 0.8662 -> 0.8651 Offset: -6.8ppm H2O span 1.0155 -> 1.0094 Offset: 0.13ppm Notes:
2017-10-13	75H-2150	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on West Pond to replace sn 0418 for calibration
2018-02-20	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2017-10-11 AGC=96.9 SDM=0 DAC1=0 DAC2=0 Ambient P=101.2kPa, Tair=24.4C, Tdew=0.15C Zero Air at 250psi, LBL Air 408.97 at 1700 Tdewspan=16.00 CO2 zero 0.9018 -> .902 Offset: .58ppm CO2 span 1.007 -> 1.007 Offset: .83ppm H2O zero 0.8649 -> .866 Offset: 7.1ppm H2O span 1.009 -> 1.009 Offset: 0ppm Notes: I didn't span the H2O because the sensor's dewpoint measurement decreased from 10 to 4.3 after 50 minutes. It didn't make sense for the H2O span to change that much. There might be an issue with the dewpoint generator.
2018-01-16	75H-2150	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from WP and brought back to the lab for calibration. it was replaced by sn 75H-2180.
2018-02-20	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2017-10-11 AGC=96.9 SDM=0 DAC1=0 DAC2=0 Ambient P=101.2kPa, Tair=24.4C, Tdew=0.15C Zero Air at 250psi, LBL Air 408.97 at 1700 Tdewspan=16.00 CO2 zero 0.9018 -> .902 Offset: .58ppm CO2 span 1.007 -> 1.007 Offset: .83ppm H2O zero 0.8649 -> .866 Offset: 7.1ppm H2O span 1.009 -> 1.009 Offset: 0ppm Notes: I didn't span the H2O because the sensor's dewpoint measurement decreased from 10 to 4.3 after 50 minutes. It didn't make sense for the H2O span to change that much. There might be an issue with the dewpoint generator.
2020-08-21	75H-2150	LI-7500A	Installed	Gas Analyzer CH4	Installed at West Pond to replace sn 0041 for calibration.
2021-03-01	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2020-08-20 AGC=100.8 SDM=0 DAC1=- DAC2=- Ambient P=100.4kPa, Tair=27.4C, Tdew=2.08C Zero Air at 500psi, AMP CA04396 408.97 at 250 Tdewspan=20.0 CO2 zero 0.9019 -> 0.9019 Offset: -0.3ppm CO2 span 1.0014 -> 0.9975 Offset: 1.93ppm H2O zero 0.8665 -> 0.8675 Offset: 6.8ppm H2O span 1.011 -> 1.0040 Offset: 0.15ppm Notes: Flow rates were larger than usual - 2lpm instead of 2cfpm.
2020-12-03	75H-2150	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from West Pond for calibration. Replaced by sn 0042.
2021-03-01	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2020-08-20 AGC=100.8 SDM=0 DAC1=- DAC2=- Ambient P=100.4kPa, Tair=27.4C, Tdew=2.08C Zero Air at 500psi, AMP CA04396 408.97 at 250 Tdewspan=20.0 CO2 zero 0.9019 -> 0.9019 Offset: -0.3ppm CO2 span 1.0014 -> 0.9975 Offset: 1.93ppm H2O zero 0.8665 -> 0.8675 Offset: 6.8ppm H2O span 1.011 -> 1.0040 Offset: 0.15ppm Notes: Flow rates were larger than usual - 2lpm instead of 2cfpm.
2021-10-07	75H-2150	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at West Pond to replace sn 75H-2182 for calibration.
2022-03-02	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2021-09-29 AGC=100 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=25.9C, Tdew=10.4C Zero Air at 975psi, AMP CA04119 524.77 at 1600 Tdewspan=20.00 CO2 zero 0.9018 -> .9016 Offset: -.7ppm CO2 span 1.0034 -> 1.0075 Offset: -2.79ppm H2O zero 0.8689 -> .8707 Offset: 12.7ppm H2O span 1.0112 -> 1.0158 Offset: -.1ppm Notes: First calibration after changing the air pump diaphragm on the dewpoint generator. The H2O span looked stable after 12-15 minutes, but I waited for 30+ min to be sure.
2022-01-20	75H-2150	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from West Pond for calibration. Replaced by sn 0035.
2022-03-02	75H-2150	LI-7500A	Calibration	Lab	Last calibration: 2021-09-29 AGC=100 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=25.9C, Tdew=10.4C Zero Air at 975psi, AMP CA04119 524.77 at 1600 Tdewspan=20.00 CO2 zero 0.9018 -> .9016 Offset: -.7ppm CO2 span 1.0034 -> 1.0075 Offset: -2.79ppm H2O zero 0.8689 -> .8707 Offset: 12.7ppm H2O span 1.0112 -> 1.0158 Offset: -.1ppm Notes: First calibration after changing the air pump diaphragm on the dewpoint generator. The H2O span looked stable after 12-15 minutes, but I waited for 30+ min to be sure.
2012-05-02	75H-2176	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on folding boom at the top of the tower.
2012-08-29	75H-2176	LI-7500A	Calibration	Lab	Calibration Date:2012-08-29 Last calibration: 2012-01-27 AGC=44 SDM=6 DAC1= DAC2= Ambient P=100.32kPa Tair=26.67C, Tdew=13.58C Zero air at 1800psi, CO2 in air 398.9ppm 2000psi Tdewspan=15.08 CO2 zero 0.8691 -> 0.8694 Offset: 1.4ppm CO2 span 1.0076 -> 1.0152 Offset: -3.8ppm H2O zero 0.8509 -> 0.8534 Offset: 14.3mmol/m3 H2O span 0.9947 -> 0.9979 Offset: 0C Notes: This IRGA seemed to be reading low in the field but no major offset seen in calibration. First lab calibration since receiving this instrument.
2012-08-23	75H-2176	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the West Pond Tower by Cove for calibration. Replaced by sn 2182.
2012-08-29	75H-2176	LI-7500A	Calibration	Lab	Calibration Date:2012-08-29 Last calibration: 2012-01-27 AGC=44 SDM=6 DAC1= DAC2= Ambient P=100.32kPa Tair=26.67C, Tdew=13.58C Zero air at 1800psi, CO2 in air 398.9ppm 2000psi Tdewspan=15.08 CO2 zero 0.8691 -> 0.8694 Offset: 1.4ppm CO2 span 1.0076 -> 1.0152 Offset: -3.8ppm H2O zero 0.8509 -> 0.8534 Offset: 14.3mmol/m3 H2O span 0.9947 -> 0.9979 Offset: 0C Notes: This IRGA seemed to be reading low in the field but no major offset seen in calibration. First lab calibration since receiving this instrument.
2013-04-26	75H-2176	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the West Pond tower to replace sn0065 for calibration
2013-08-27	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2013-05-02 AGC=87 SDM=1 DAC1=na DAC2=na Ambient P=99.84kPa, Tair=26.53C, Tdew=13.56C Zero Air at 1700psi, God CO2 421.22 at 1600 Tdewspan=15.18 CO2 zero 0.8676 -> 0.8685 Offset: 3.78ppm CO2 span 1.0038 -> 1.0099 Offset: -3.34ppm H2O zero 0.8539 -> 0.8539 Offset: 0.0ppm H2O span 0.9906 -> 1.0 Offset: -0.2ppm Notes:
2013-08-21	75H-2176	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the West Pond tower for calibration. Replaced with sn 2182
2013-08-27	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2013-05-02 AGC=87 SDM=1 DAC1=na DAC2=na Ambient P=99.84kPa, Tair=26.53C, Tdew=13.56C Zero Air at 1700psi, God CO2 421.22 at 1600 Tdewspan=15.18 CO2 zero 0.8676 -> 0.8685 Offset: 3.78ppm CO2 span 1.0038 -> 1.0099 Offset: -3.34ppm H2O zero 0.8539 -> 0.8539 Offset: 0.0ppm H2O span 0.9906 -> 1.0 Offset: -0.2ppm Notes:
2015-05-07	75H-2176	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the West Pond tower to replace sn 75H-2182 for calibration.
2015-10-28	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2015-05-05 AGC=90.65 SDM=6 DAC1=- DAC2=- Ambient P=100.3kPa, Tair=21.39C, Tdew=14.08C Zero Air at 750psi, God CO2 421.22 at 800 Tdewspan=11.08 CO2 zero 0.8692 -> 0.8691 Offset: -0.61ppm CO2 span 1.0216 -> 1.0177 Offset: 2.1ppm H2O zero 0.8562 -> 0.8565 Offset: 1.5ppm H2O span 1.0239 -> 1.0086 Offset: 0.3ppm Notes:
2015-09-02	75H-2176	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the West Pond tower for calibration. Replaced by sn 75H-2180
2015-10-28	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2015-05-05 AGC=90.65 SDM=6 DAC1=- DAC2=- Ambient P=100.3kPa, Tair=21.39C, Tdew=14.08C Zero Air at 750psi, God CO2 421.22 at 800 Tdewspan=11.08 CO2 zero 0.8692 -> 0.8691 Offset: -0.61ppm CO2 span 1.0216 -> 1.0177 Offset: 2.1ppm H2O zero 0.8562 -> 0.8565 Offset: 1.5ppm H2O span 1.0239 -> 1.0086 Offset: 0.3ppm Notes:
2016-06-06	75H-2176	LI-7500A	Installed	Gas Analyzer CO2/H2O	installed at west pond to replace sn 1594 for calibration.
2016-10-25	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2016-06-03 AGC=91.2 SDM=6 DAC1=- DAC2=- Ambient P=100.28kPa, Tair=20.11C, Tdew=12.3C Zero Air at 400psi, God CO2 421.22 at 450 Tdewspan=16.01 CO2 zero 0.8688 -> 0.8689 Offset: 0.22ppm CO2 span 1.0175 -> 1.0176 Offset: -0.12ppm H2O zero 0.8571 -> 0.8563 Offset: -4.9ppm H2O span 1.0281 -> 1.0134 Offset: 0.31ppm Notes:
2016-09-13	75H-2176	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed Li7500 from West Pond tower for calibration. Replaced by 75H-2150.
2016-10-25	75H-2176	LI-7500A	Calibration	Lab	Last calibration: 2016-06-03 AGC=91.2 SDM=6 DAC1=- DAC2=- Ambient P=100.28kPa, Tair=20.11C, Tdew=12.3C Zero Air at 400psi, God CO2 421.22 at 450 Tdewspan=16.01 CO2 zero 0.8688 -> 0.8689 Offset: 0.22ppm CO2 span 1.0175 -> 1.0176 Offset: -0.12ppm H2O zero 0.8571 -> 0.8563 Offset: -4.9ppm H2O span 1.0281 -> 1.0134 Offset: 0.31ppm Notes:
2014-09-08	75H-2180	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the West Pond tower with 7550 sn AIU-0666. There was no 7550-7500A pair on the tower due to issues when we tried to swap the head on 9/4.
2015-04-20	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2014-09-02 AGC=98.0 SDM=1 DAC1=- DAC2=- Ambient P=99.87kPa, Tair=20.88C, Tdew=11.21C Zero Air at 850psi, God CO2 421.22 at 1100 Tdewspan=15.96 CO2 zero 0.9143 -> 0.9146 Offset: 1.39ppm CO2 span 1.0134 -> 1.0232 Offset: -5.12ppm H2O zero 0.8812 -> 0.8819 Offset: 4.6ppm H2O span 1.0193 -> 1.0154 Offset: 0.08ppm Notes: Pressure coefficients might not have been reset.
2015-01-20	75H-2180	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from West Pond for calibration. Replaced by sn 75H-2182.
2015-04-20	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2014-09-02 AGC=98.0 SDM=1 DAC1=- DAC2=- Ambient P=99.87kPa, Tair=20.88C, Tdew=11.21C Zero Air at 850psi, God CO2 421.22 at 1100 Tdewspan=15.96 CO2 zero 0.9143 -> 0.9146 Offset: 1.39ppm CO2 span 1.0134 -> 1.0232 Offset: -5.12ppm H2O zero 0.8812 -> 0.8819 Offset: 4.6ppm H2O span 1.0193 -> 1.0154 Offset: 0.08ppm Notes: Pressure coefficients might not have been reset.
2015-09-02	75H-2180	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the West Pond tower to replace sn 75H-2176 for calibration.
2016-02-09	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2015-08-25 AGC=99.2 SDM=6 DAC1=- DAC2=- Ambient P=100.61kPa, Tair=26.61C, Tdew=8.90C Zero Air at 700psi, God CO2 421.22 at 700 Tdewspan=11.08 CO2 zero 0.9145 -> 0.9145 Offset: -0.21ppm CO2 span 1.0275 -> 1.0203 Offset: 3.88ppm H2O zero 0.8865 -> 0.8847 Offset: -10.6ppm H2O span 1.0123 -> 1.0241 Offset: -0.22ppm Notes:
2015-12-08	75H-2180	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the West Pond tower for calibration. Replaced by sn 0065
2016-02-09	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2015-08-25 AGC=99.2 SDM=6 DAC1=- DAC2=- Ambient P=100.61kPa, Tair=26.61C, Tdew=8.90C Zero Air at 700psi, God CO2 421.22 at 700 Tdewspan=11.08 CO2 zero 0.9145 -> 0.9145 Offset: -0.21ppm CO2 span 1.0275 -> 1.0203 Offset: 3.88ppm H2O zero 0.8865 -> 0.8847 Offset: -10.6ppm H2O span 1.0123 -> 1.0241 Offset: -0.22ppm Notes:
2018-01-16	75H-2180	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at WP to replace sn 75H-2150.
2018-06-25	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2018-01-10 AGC=100.3 SDM=0 DAC1=- DAC2=- Ambient P=100.5kPa, Tair=26.3C, Tdew=13.2C Zero Air at 300psi, AMP 408.97 at 1350 Tdewspan=15.99 CO2 zero 0.9147 -> 0.9141 Offset: -3.0ppm CO2 span 1.0362 -> 1.0267 Offset: 4.93ppm H2O zero 0.8864 -> 0.8865 Offset: 0.5ppm H2O span 1.0168 -> 1.0274 Offset: -0.21ppm Notes: Calibrated by Joe
2018-04-20	75H-2180	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from WP and brought back to the lab for calibration. It was replaced by sn 75H-2514.
2018-06-25	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2018-01-10 AGC=100.3 SDM=0 DAC1=- DAC2=- Ambient P=100.5kPa, Tair=26.3C, Tdew=13.2C Zero Air at 300psi, AMP 408.97 at 1350 Tdewspan=15.99 CO2 zero 0.9147 -> 0.9141 Offset: -3.0ppm CO2 span 1.0362 -> 1.0267 Offset: 4.93ppm H2O zero 0.8864 -> 0.8865 Offset: 0.5ppm H2O span 1.0168 -> 1.0274 Offset: -0.21ppm Notes: Calibrated by Joe
2023-04-03	75H-2180	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at West Pond to replace sn 0065 for calibration.
2023-07-19	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2023-03-29 AGC=100.5 SDM= DAC1= DAC2= AIU sn AIU-1569, Presure A0=58.004, A1=15.479 Ambient P=100.5kPa, Tair=23.4C, Tdew=13.1C Zero Air at 1000psi, AMP CA04119 524.77 at 950 Tdewspan=16.00 CO2 zero 0.9149 -> .9143 Offset: -2.92ppm CO2 span 1.044 -> 1.0374 Offset: 4.45ppm H2O zero 0.8913 -> .8941 Offset: 17.6ppm H2O span 1.0275 -> 1.0299 Offset: -.04ppm Notes: Slightly higher H2O zero offset than usual. Used CO2 span point of "524.55" to get the sensor to 524.77. Vertical orientation.
2023-07-11	75H-2180	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from West Pond for calibration. Replaced by sn 75H-2514.
2023-07-19	75H-2180	LI-7500A	Calibration	Lab	Last calibration: 2023-03-29 AGC=100.5 SDM= DAC1= DAC2= AIU sn AIU-1569, Presure A0=58.004, A1=15.479 Ambient P=100.5kPa, Tair=23.4C, Tdew=13.1C Zero Air at 1000psi, AMP CA04119 524.77 at 950 Tdewspan=16.00 CO2 zero 0.9149 -> .9143 Offset: -2.92ppm CO2 span 1.044 -> 1.0374 Offset: 4.45ppm H2O zero 0.8913 -> .8941 Offset: 17.6ppm H2O span 1.0275 -> 1.0299 Offset: -.04ppm Notes: Slightly higher H2O zero offset than usual. Used CO2 span point of "524.55" to get the sensor to 524.77. Vertical orientation.
2012-08-23	75H-2182	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the West Pond tower to replace sn 2176 for calibration.
2013-08-20	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2013-05-02 AGC=83.9 SDM=1 DAC1=na DAC2=na Ambient P=100.10kPa, Tair=23.58C, Tdew=15.58C Zero Air at 1700psi, God CO2 421.22 at 1600 Tdewspan=15.19 CO2 zero 0.8837 -> 0.8802 Offset: -16.20ppm CO2 span 1.0037 -> 0.9947 Offset: 3.47ppm H2O zero 0.8417 -> 0.8471 Offset: 34.9ppm H2O span 0.9978 -> 0.9854 Offset: 0.27ppm Notes: Last cal was don at the factory after upgrade. Large zero offsets.
2013-01-03	75H-2182	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the West Pond tower for calibration and to swap out the 7550 box (sn 0397) for repair of the condensation problem. Replaced by sn 0065 and AIU-0666.
2013-08-20	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2013-05-02 AGC=83.9 SDM=1 DAC1=na DAC2=na Ambient P=100.10kPa, Tair=23.58C, Tdew=15.58C Zero Air at 1700psi, God CO2 421.22 at 1600 Tdewspan=15.19 CO2 zero 0.8837 -> 0.8802 Offset: -16.20ppm CO2 span 1.0037 -> 0.9947 Offset: 3.47ppm H2O zero 0.8417 -> 0.8471 Offset: 34.9ppm H2O span 0.9978 -> 0.9854 Offset: 0.27ppm Notes: Last cal was don at the factory after upgrade. Large zero offsets.
2013-08-21	75H-2182	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on the West Pond tower to replace sn 2176 for calibration
2014-02-28	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2013-08-20 AGC=83.8 SDM=1 DAC1=- DAC2=- Ambient P=98.10kPa, Tair=19.40C, Tdew=9.95C Zero air at 1400psi, God CO2 421.22 at 1500 Tdewspan=15.17 CO2 zero 0.8802 -> 0.8815 Offset: 5.98ppm CO2 span 0.9947 -> 1.0064 Offset: -4.84ppm H2O zero 0.8471 -> 0.8476 Offset: 2.5ppm H2O span 0.9854 -> 0.9875 Offset: -0.05ppm Notes: Using box sn 0666. Before calibration upgraded firmware from v6.5.5 to v7.0.1 - FPGA v6.0.3 not needing update.
2013-12-19	75H-2182	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the West Pond Tower for calibration. Replaced by sn 75H-2150.
2014-02-28	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2013-08-20 AGC=83.8 SDM=1 DAC1=- DAC2=- Ambient P=98.10kPa, Tair=19.40C, Tdew=9.95C Zero air at 1400psi, God CO2 421.22 at 1500 Tdewspan=15.17 CO2 zero 0.8802 -> 0.8815 Offset: 5.98ppm CO2 span 0.9947 -> 1.0064 Offset: -4.84ppm H2O zero 0.8471 -> 0.8476 Offset: 2.5ppm H2O span 0.9854 -> 0.9875 Offset: -0.05ppm Notes: Using box sn 0666. Before calibration upgraded firmware from v6.5.5 to v7.0.1 - FPGA v6.0.3 not needing update.
2015-01-20	75H-2182	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on West Pond to Replace sn 75H-2180 for calibration
2015-07-15	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2015-01-13 AGC=84.3 SDM=1 DAC1=- DAC2=- Ambient P=100.19kPa, Tair=22.31C, Tdew=15.05C Zero Air at 800psi, God CO2 421.22 at 850 Tdewspan=11.08 CO2 zero 0.8824 -> 0.8825 Offset: 0.43ppm CO2 span 1.0118 -> 1.0064 Offset: 2.88ppm H2O zero 0.8453 -> 0.8458 Offset: 2.9ppm H2O span 1.0078 -> 1.0016 Offset: 0.12ppm Notes:
2015-05-07	75H-2182	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the West Pond tower for calibration. Replaced by sn 75H-2176
2015-07-15	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2015-01-13 AGC=84.3 SDM=1 DAC1=- DAC2=- Ambient P=100.19kPa, Tair=22.31C, Tdew=15.05C Zero Air at 800psi, God CO2 421.22 at 850 Tdewspan=11.08 CO2 zero 0.8824 -> 0.8825 Offset: 0.43ppm CO2 span 1.0118 -> 1.0064 Offset: 2.88ppm H2O zero 0.8453 -> 0.8458 Offset: 2.9ppm H2O span 1.0078 -> 1.0016 Offset: 0.12ppm Notes:
2018-10-25	75H-2182	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at WP to replace sn 0042, which was brought back to the lab for calibration.
2019-04-15	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2018-10-24 AGC=87.6 SDM=0 DAC1=- DAC2=- Ambient P=100.19kPa, Tair=26.94C, Tdew=7.42C Zero Air 369068 at 1100psi, AMP CA04396 408.97 at 750 Tdewspan=15.99 CO2 zero 0.8844 -> 0.8842 Offset: -1.10ppm CO2 span 1.0188 -> 1.0156 Offset: 0.08ppm H2O zero 0.8449 -> 0.8459 Offset: 6.3ppm H2O span 1.0143 -> 1.0189 Offset: -0.1ppm Notes: by Joe
2019-02-12	75H-2182	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from WP and brought back to the lab for calibration. It was replaced by 75H-2668.
2019-04-15	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2018-10-24 AGC=87.6 SDM=0 DAC1=- DAC2=- Ambient P=100.19kPa, Tair=26.94C, Tdew=7.42C Zero Air 369068 at 1100psi, AMP CA04396 408.97 at 750 Tdewspan=15.99 CO2 zero 0.8844 -> 0.8842 Offset: -1.10ppm CO2 span 1.0188 -> 1.0156 Offset: 0.08ppm H2O zero 0.8449 -> 0.8459 Offset: 6.3ppm H2O span 1.0143 -> 1.0189 Offset: -0.1ppm Notes: by Joe
2019-08-07	75H-2182	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at WP to replace sn 0418, which was brought back to the lab for calibration.
2019-11-18	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2019-08-01 AGC=100.0 SDM=0 DAC1=- DAC2=- Ambient P=100.3kPa, Tair=27.5C, Tdew=9.64C Zero Air at 950psi, AMP CA04396 408.97 at 600 Tdewspan=20.0 CO2 zero 0.8846 -> 0.8846 Offset: -0.05ppm CO2 span 1.0226 -> 1.0217 Offset: 0.33ppm H2O zero 0.8456 -> 0.8462 Offset: 3.6ppm H2O span 1.0214 -> 1.0265 Offset: -0.1ppm Notes:
2019-11-14	75H-2182	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from West Pond and brought back to the lab for calibration. Replaced by sn 75H-2667.
2019-11-18	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2019-08-01 AGC=100.0 SDM=0 DAC1=- DAC2=- Ambient P=100.3kPa, Tair=27.5C, Tdew=9.64C Zero Air at 950psi, AMP CA04396 408.97 at 600 Tdewspan=20.0 CO2 zero 0.8846 -> 0.8846 Offset: -0.05ppm CO2 span 1.0226 -> 1.0217 Offset: 0.33ppm H2O zero 0.8456 -> 0.8462 Offset: 3.6ppm H2O span 1.0214 -> 1.0265 Offset: -0.1ppm Notes:
2021-05-26	75H-2182	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at West Pond to replace sn 0073 for calibration.
2021-11-30	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2021-05-25 AGC=100.0 SDM=0 DAC1=- DAC2=- Ambient P=100.8kPa, Tair=27.1C, Tdew=12.5C Zero Air at 1400psi, AMP CA04119 524.77 at 1700 Tdewspan=20.0 CO2 zero 0.8846 -> 0.8850 Offset: 1.7ppm CO2 span 1.0217 -> 1.0219 Offset: -0.07ppm H2O zero 0.8464 -> 0.8470 Offset: 4.0ppm H2O span 1.024 -> 1.0264 Offset: -0.06ppm Notes:
2021-10-07	75H-2182	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from West Pond for calibration. Replaced by sn 75H-2150.
2021-11-30	75H-2182	LI-7500A	Calibration	Lab	Last calibration: 2021-05-25 AGC=100.0 SDM=0 DAC1=- DAC2=- Ambient P=100.8kPa, Tair=27.1C, Tdew=12.5C Zero Air at 1400psi, AMP CA04119 524.77 at 1700 Tdewspan=20.0 CO2 zero 0.8846 -> 0.8850 Offset: 1.7ppm CO2 span 1.0217 -> 1.0219 Offset: -0.07ppm H2O zero 0.8464 -> 0.8470 Offset: 4.0ppm H2O span 1.024 -> 1.0264 Offset: -0.06ppm Notes:
2018-04-20	75H-2514	LI-7500A	Installed	Gas Analyzer CO2/H2O	Replaced sn 75H-2180 at WP, which was brought back to the lab for calibration.
2018-09-26	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2018-04-18 AGC=100.1 SDM=0 DAC1=0 DAC2=0 Ambient P=100.3kPa, Tair=27.3C, Tdew=12.7C Zero Air at 1600psi, AMP Air 408.97 at 1200 Tdewspan=16.00 CO2 zero 0.906 -> .9045 Offset: -6.04ppm CO2 span 1.0106 -> 1.0036 Offset: 3.52ppm H2O zero 0.8368 -> .8370 Offset: 1.3ppm H2O span 1.016 -> 1.0165 Offset: -.01ppm Notes:
2018-07-12	75H-2514	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from WP and brought back to the lab for calibration. It was replaced by sn 0042.
2018-09-26	75H-2514	LI-7500A	Calibration	Lab	Last calibration: 2018-04-18 AGC=100.1 SDM=0 DAC1=0 DAC2=0 Ambient P=100.3kPa, Tair=27.3C, Tdew=12.7C Zero Air at 1600psi, AMP Air 408.97 at 1200 Tdewspan=16.00 CO2 zero 0.906 -> .9045 Offset: -6.04ppm CO2 span 1.0106 -> 1.0036 Offset: 3.52ppm H2O zero 0.8368 -> .8370 Offset: 1.3ppm H2O span 1.016 -> 1.0165 Offset: -.01ppm Notes:
2023-07-11	75H-2514	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at West Pond to replace sn 75H-2180 for calibration.
2023-11-13	75H-2514	LI-7500A	Calibration	Factory	Calibrated at Licor after chopper motor replacement - see RMA doc: rma_Licor_00248550_sn75H-2514_20231201.pdf. The new calibration numbers (see cal doc: cal_Licor_LI-7500A_sn75H-2514_20231113.pdf) will need to be manually entered in 7550 configuration file.
2023-10-04	75H-2514	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from West Pond because of PLL error; CO2 and H2O were both 0. Not sure if this is because of sensor age or because of daily power cycles from a failing solar power system. Replaced by sn 1594.
2023-11-13	75H-2514	LI-7500A	Calibration	Factory	Calibrated at Licor after chopper motor replacement - see RMA doc: rma_Licor_00248550_sn75H-2514_20231201.pdf. The new calibration numbers (see cal doc: cal_Licor_LI-7500A_sn75H-2514_20231113.pdf) will need to be manually entered in 7550 configuration file.
2016-12-21	75H-2667	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at West Pond after calibration in the lab to replace 75H-2150
2017-03-21	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2016-12-19 AGC=106.9 SDM= DAC1= DAC2= Ambient P=99.8kPa, Tair=24.3C, Tdew=10.04C Zero Air at 1700psi, God CO2 421.22 at 350 Tdewspan=16.00 CO2 zero 0.9421 -> 0.9423 Offset: 0.60ppm CO2 span 1.0156 -> 1.0144 Offset: 0.43ppm H2O zero 0.8378 -> 0.8380 Offset: 1.3ppm H2O span 1.0214 -> 1.0219 Offset: -0.01ppm Notes:
2017-03-15	75H-2667	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from West Pond and returned to lab for calibration. It was replaced by 75H-2668.
2017-03-21	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2016-12-19 AGC=106.9 SDM= DAC1= DAC2= Ambient P=99.8kPa, Tair=24.3C, Tdew=10.04C Zero Air at 1700psi, God CO2 421.22 at 350 Tdewspan=16.00 CO2 zero 0.9421 -> 0.9423 Offset: 0.60ppm CO2 span 1.0156 -> 1.0144 Offset: 0.43ppm H2O zero 0.8378 -> 0.8380 Offset: 1.3ppm H2O span 1.0214 -> 1.0219 Offset: -0.01ppm Notes:
2019-11-14	75H-2667	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at West Pond to replace sn 75H-2182 for calibration.
2020-05-13	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2019-11-12 AGC=102 SDM= DAC1= DAC2= Ambient P=100.7kPa, Tair=21.3C, Tdew=10.6C Zero Air at 725psi, AMP CA4396 408.97 at 500 Tdewspan=16.00 CO2 zero 0.9419 -> .9422 Offset: 1.29ppm CO2 span 1.019 -> 1.0196 Offset: -0.25ppm H2O zero 0.8384 -> 0.8380 Offset: -2.3ppm H2O span 1.0239 -> 1.0313 Offset: -0.15ppm Notes:
2020-02-20	75H-2667	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from West Pond for calibration. Replaced by sn 0418.
2020-05-13	75H-2667	LI-7500A	Calibration	Lab	Last calibration: 2019-11-12 AGC=102 SDM= DAC1= DAC2= Ambient P=100.7kPa, Tair=21.3C, Tdew=10.6C Zero Air at 725psi, AMP CA4396 408.97 at 500 Tdewspan=16.00 CO2 zero 0.9419 -> .9422 Offset: 1.29ppm CO2 span 1.019 -> 1.0196 Offset: -0.25ppm H2O zero 0.8384 -> 0.8380 Offset: -2.3ppm H2O span 1.0239 -> 1.0313 Offset: -0.15ppm Notes:
2017-03-15	75H-2668	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at West Pond to replace 75H-2667.
2017-07-25	75H-2668	LI-7500A	Calibration	Lab	Last calibration: 2017-03-14 AGC=100.2 SDM= DAC1= DAC2= Ambient P=100.4kPa, Tair=21.4C, Tdew=13.0C Zero Air at 1200psi, LBL Air 408.97 at 2100 Tdewspan=16.00 CO2 zero 0.9392 -> .9395 Offset: 1.41ppm CO2 span 1.0131 -> 1.0159 Offset: -1.5ppm H2O zero 0.9041 -> .9047 Offset: 3.2ppm H2O span 1.0063 -> 1.0107 Offset: -.10ppm Notes:
2017-06-23	75H-2668	LI-7500A	Adjusted	Gas Analyzer CO2/H2O	Slated to be removed for calibration but replacement 75H-0418 measured unreasonable H20 levels.
2017-07-25	75H-2668	LI-7500A	Calibration	Lab	Last calibration: 2017-03-14 AGC=100.2 SDM= DAC1= DAC2= Ambient P=100.4kPa, Tair=21.4C, Tdew=13.0C Zero Air at 1200psi, LBL Air 408.97 at 2100 Tdewspan=16.00 CO2 zero 0.9392 -> .9395 Offset: 1.41ppm CO2 span 1.0131 -> 1.0159 Offset: -1.5ppm H2O zero 0.9041 -> .9047 Offset: 3.2ppm H2O span 1.0063 -> 1.0107 Offset: -.10ppm Notes:
2017-07-03	75H-2668	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from West Pond for calibration. Replaced by 75H-0418.
2017-07-25	75H-2668	LI-7500A	Calibration	Lab	Last calibration: 2017-03-14 AGC=100.2 SDM= DAC1= DAC2= Ambient P=100.4kPa, Tair=21.4C, Tdew=13.0C Zero Air at 1200psi, LBL Air 408.97 at 2100 Tdewspan=16.00 CO2 zero 0.9392 -> .9395 Offset: 1.41ppm CO2 span 1.0131 -> 1.0159 Offset: -1.5ppm H2O zero 0.9041 -> .9047 Offset: 3.2ppm H2O span 1.0063 -> 1.0107 Offset: -.10ppm Notes:
2019-02-12	75H-2668	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed at WP to replace 75H-2182, which was brought back to the lab for calibration.
2019-04-26	75H-2668	LI-7500A	Calibration	Lab	Last calibration: 2019-02-11 AGC=100.0 SDM= DAC1= DAC2= Ambient P=100.4kPa, Tair=24.5C, Tdew=11.1C Zero Air at 1050psi, AMP CA4396 408.97 at 700 Tdewspan=16.00 CO2 zero 0.939 -> .9391 Offset: .22ppm CO2 span 0.018 -> 1.0169 Offset: .59ppm H2O zero 0.9073 -> .9069 Offset: -2.2ppm H2O span 1.0117 -> 1.0139 Offset: -.05ppm Notes:
2019-04-25	75H-2668	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from West Pond for calibration. Replaced by sn 0418
2019-04-26	75H-2668	LI-7500A	Calibration	Lab	Last calibration: 2019-02-11 AGC=100.0 SDM= DAC1= DAC2= Ambient P=100.4kPa, Tair=24.5C, Tdew=11.1C Zero Air at 1050psi, AMP CA4396 408.97 at 700 Tdewspan=16.00 CO2 zero 0.939 -> .9391 Offset: .22ppm CO2 span 0.018 -> 1.0169 Offset: .59ppm H2O zero 0.9073 -> .9069 Offset: -2.2ppm H2O span 1.0117 -> 1.0139 Offset: -.05ppm Notes:
2022-04-20	TG1-0155	LI-7700	Installed	Gas Analyzer CH4	Installed at WP to replace TG1-0421, which was removed last week for power issues.
2022-06-09	TG1-0155	LI-7700	Calibration		Calibration Location: West Pond Last calibration: 2021-12-06 RSSI=90%, Optical RH=3% Ambient P=101.1kPa, Tair=30.1C Zero Air at 400psi, AMP CA04119 4.2238 at 1550 CH4 Zero Offset: .016ppm CH4 Span Offset: .0028ppm Notes: Hot but relatively still at this site
2023-01-18	TG1-0155	LI-7700	Calibration		Calibration Location: West Pond Last calibration: 2022-06-09 RSSI=81%, Optical RH=10% Ambient P=101.9kPa, Tair=12.3C Zero Air at 1500psi, AMP CA04396 1.9317 at 1125 CH4 Zero Offset: .008ppm CH4 Span Offset: .0103ppm Notes: Since optics RH = 10%, I did not change desiccant or flush headspace after calibration.
2023-06-15	TG1-0155	LI-7700	Calibration		Calibration Location: West Pond Last calibration: 2023-01-18 RSSI=89%, Optical RH=13% Ambient P=101.0kPa, Tair=26.2C Zero Air at 1100psi, AMP CA04119 4.2238 at 1050 CH4 Zero Offset: 0ppm CH4 Span Offset: -.0088ppm Notes: Zero was right on! Since the optics RH=13% which is pretty good, we did not flush its headspace or change its desiccant. The heater and cleaning settings were set to the default (maybe because of recent power outages). I updated both to what I remember to be our usual settings.
2024-01-04	TG1-0155	LI-7700	Removed	Gas Analyzer CH4	Removed from WP tower with initial decommissioning of the site
2012-05-02	TG1-0223	LI-7700	Removed	Gas Analyzer CH4	Removed from the Sherman tower for use at West pond. Replaced by LGR (sn 08-114).
2012-05-02	TG1-0223	LI-7700	Installed	Gas Analyzer CH4	Installed at West Pond on the folding boom at the top of the tower.
2012-09-06	TG1-0223	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: West Pond Last calibration: RSSI=69%, Optical RH=% Ambient P=kPa, Tair=C ultra zero air at 1900psi, ch4 in air 4.982 at 950 CH4 Zero Offset: 0.047ppm CH4 Span Offset: 0.010ppm Notes: Calibrated on the West Pond tower by Cove and Joe. Last cal is the original done at Licor.
2013-02-19	TG1-0223	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: West Pond Last calibration: 2012-09-06 RSSI=66.8%, Optical RH=1.0% Ambient P=101.98kPa, Tair=10.8C Zero Air at 1800psi, 2nd CH4 in Air 4.982 at 1300 CH4 Zero Offset: 0.016ppm CH4 Span Offset: 0.006ppm Notes:
2013-08-21	TG1-0223	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: West Pond Last calibration: 2013-02-19 RSSI=78%, Optical RH=3% Ambient P=101.1kPa, Tair=21.8C Zero Air at 1700psi, CH4 in air 4.995 at 1300 CH4 Zero Offset: 0.01ppm CH4 Span Offset: 0.013ppm Notes:
2014-03-07	TG1-0223	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: West Pond Last calibration: 2013-08-21 RSSI=73.8%, Optical RH=7% Ambient P=102.4kPa, Tair=20.7C Zero Air at 1600psi, 2nd CH4 4.995 at 1100 CH4 Zero Offset: 0.01ppm CH4 Span Offset: 0.001ppm Notes: Calibrated by Cove and Sara after firmware upgrade to v 1.0.21. Windy day. Windy day.
2014-09-10	TG1-0223	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: West Pond Last calibration: 2014-03-07 RSSI=82%, Optical RH=12% Ambient P=100.88kPa, Tair=31.5C Zero Air at 1400psi, 2nd CH4 4.995 at 750 CH4 Zero Offset: 0.025ppm CH4 Span Offset: -0.085ppm Notes: Very hot day with no wind. Span offset a little large.
2015-03-24	TG1-0223	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: West Pond Last calibration: 2014-09-10 RSSI=80%, Optical RH=19% Ambient P=102.3kPa, Tair=20.8C Zero air at 1200psi, 2nd CH4 4.995 at 600 CH4 Zero Offset: -0.001ppm CH4 Span Offset: 0.08ppm Notes:
2015-09-30	TG1-0223	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: West Pond Last calibration: 2015-03-24 RSSI=66.5%, Optical RH=25% Ambient P=101.3kPa, Tair=18.1C Zero Air at 1050psi, AMP CH4 1.9966 at 1500 CH4 Zero Offset: 0.013ppm CH4 Span Offset: -0.0066ppm Notes: light, sporadic rain - no wind
2016-04-13	TG1-0223	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: West Pond Last calibration: 2015-09-30 RSSI=84.2%, Optical RH=24% Ambient P=101.74kPa, Tair=22.97C Zero Air at 900psi, AMP CH4 1.9966 at 700 CH4 Zero Offset: 0.011ppm CH4 Span Offset: 0.001ppm Notes:
2016-10-11	TG1-0223	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: west pond Last calibration: 2016-04-13 RSSI=71%, Optical RH=27% Ambient P=101.3kPa, Tair=22C zero air at 700psi, AMP CH4 4.030 at 1200 CH4 Zero Offset: 0.001ppm CH4 Span Offset: -0.006ppm Notes: Breezy.
2017-03-23	TG1-0223	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: West Pond Last calibration: 2016-10-11 RSSI=86.2%, Optical RH=16% Ambient P=102.0kPa, Tair=17.6C Zero Air at 750psi, Ameriflux CH4 4.0304 at 1100 CH4 Zero Offset: -0.041ppm CH4 Span Offset: -0.0251ppm Notes: Changed dessicant and optics RH = 27%. Flushed head with span gas and optics RH dropped to 16%.
2017-10-13	TG1-0223	LI-7700	Removed	Gas Analyzer CH4	Removed from West Pond for calibration. Replaced by sn TG1-0424
2018-04-05	TG1-0224	LI-7700	Installed	Gas Analyzer CH4	Installed at WP to replace sn TG1-0424, which was brought back to the lab for calibration.
2018-10-25	TG1-0224	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: West Pond Last calibration: 2018-04-04 RSSI=70%, Optical RH=22% Ambient P=101.7kPa, Tair=25.5C Zero Air at 1950psi, AMP Air 3.121 at 2100 CH4 Zero Offset: -.004ppm CH4 Span Offset: -.002ppm Notes: Calm day. Before calibrating, we flushed head spaced with zero air. Optics RH dried down from 22% to 13% before calibration started.
2019-04-11	TG1-0224	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: West Pond Last calibration: 2018-10-25 RSSI=71%, Optical RH=24% Ambient P=101.8kPa, Tair=17.2C Zero Air M4002 at 1600psi, AMP CA03923 3.1210 at 1700 CH4 Zero Offset: -0.005ppm CH4 Span Offset: 0.008ppm Notes: Windy day. Optical RH high - needs new desiccant.
2019-04-25	TG1-0224	LI-7700	Upgrade	Gas Analyzer CH4	The LI-7700 firmware was upgraded from v1.0.21 to v1.0.27 mostly minor bug fixes see change log https://www.licor.com/env/support/LI-7700/topics/change-log.html
2019-10-22	TG1-0224	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: West Pond Last calibration: 2019-04-11 RSSI=72%, Optical RH=27% Ambient P=101.8kPa, Tair=27.2C Zero Air at 1300psi, AMP CA03923 3.121 at 1200 CH4 Zero Offset: 0.043ppm CH4 Span Offset: 0.000ppm Notes: Was stabilizing at 0.033 for zero but went up after adjusting gas flow. Optics desiccant swapped after calibration. Cal gas used to dry head space. New RH about 10%
2020-05-19	TG1-0224	LI-7700	Calibration	Gas Analyzer CH4	Calibration Location: West Pond Last calibration: 2019-10-22 RSSI=71%, Optical RH=9% Ambient P=101.5kPa, Tair=21.5C Zero Air at 950psi, AMP CA3923 3.121 at 900 CH4 Zero Offset: -0.022ppm CH4 Span Offset: -0.003ppm Notes: Breezy day
2020-11-19	TG1-0224	LI-7700	Removed	Gas Analyzer CH4	Removed from West Pond for calibration. Replaced by sn TG1-0421. It was brought back to the lab because its name was "Unknown" in both the 7550 and 7700 software instead of the usual serial number.
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.
2020-11-19	TG1-0421	LI-7700	Calibration		Calibration Location: West Pond Last calibration: 2020-05-19 RSSI=80%, Optical RH=8% Ambient P=102.0kPa, Tair=17.0C Zero Air at 500psi, AMP CA3923 3.121 at 500 CH4 Zero Offset: 0.005ppm CH4 Span Offset: 0.002ppm Notes: Still day. This sensor was originally at BA before we moved it to WP to calibrate. The sensor usually at WP (sn TG1-0224) was removed and brought back to the lab because its serial number was not recognized in the 7700 or 7550 software.
2021-05-26	TG1-0421	LI-7700	Calibration		Calibration Location: West Pond Last calibration: 2020-11-19 RSSI=80%, Optical RH=12% Ambient P=101.2kPa, Tair=29.1C AMP FB04161 at 800psi, AMP CA04119 4.223 at 2100 CH4 Zero Offset: -0.024ppm CH4 Span Offset: 0.043ppm Notes: Relatively still day. Zero gas was an AMP cal gas in a baby tank that we borrowed for the day. Zero offset and span are a bit higher than I usually see on 7700s. A lot of bounce in concentrations from Dennis and Robert talking and wiggling the upper boardwalk.
2021-11-30	TG1-0421	LI-7700	Calibration		Calibration Location: West Pond Last calibration: 2021-06-01 RSSI=87%, Optical RH=18% Ambient P=101.4kPa, Tair=18.6C Zero Air at 100psi, AMP CA04396 1.9317 at 1750 CH4 Zero Offset: .050ppm CH4 Span Offset: .0023ppm Notes: Relatively still day. The zero air tank pressure may have been >100psi, but the regulator was wonky. Zero was stable for 2min after applying zero.
2022-04-13	TG1-0421	LI-7700	Removed	Gas Analyzer CH4	Removed from West Pond and brought back to the lab. I couldn't connect to this sensor. The power LED light was blinking intermittently. Ethernet and Status LEDs were off. I removed the power cable as well since there was a crack in the plastic cable collar at the sensor. The wash power, wash tubing, and Ethernet cable are still there.
2017-10-13	TG1-0424	LI-7700	Installed	Gas Analyzer CH4	Installed on West Pond to replace sn TG1-0223 for calibration
2018-04-05	TG1-0424	LI-7700	Removed	Gas Analyzer CH4	Removed from WP and brought back to the lab for calibration. It was replaced by sn TG1-0224.

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