Equipment and Calibration
Equipment history at Twitchell Alfalfa| ALL | | Anemometer || Battery Bank || Camera || CO2 Probe || Data Logger || Forced Diffusion || Gas Analyzer || Heat Flux Plate || Interface || LED sensor || Multiplexer || Narrow Band || Net Radiometer || PAR Sensor || Precipitation || RH & Temp || Soil Moisture Probe || Solar Controller || Solar Panel || Weather Station |
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 | |||||
| 2017-09-06 | 0035 | LI-7500A | Installed | Gas Analyzer CO2/H2O | Installed on Twitchell Alfalfa to replace sn 1594 for calibration. |
| 2018-01-12 | 0035 | LI-7500A | Calibration | Lab | Last calibration: 2017-09-05 AGC=98.9 SDM=0 DAC1=0 DAC2=0 Ambient P=101.5kPa, Tair=20.5C, Tdew=10.2C Zero Air at 250psi, LBL Air 408.97 at 1700 Tdewspan=16.00 CO2 zero 0.9373 -> .9378 Offset: 1.97ppm CO2 span 1.0084 -> 1.0288 Offset: -10.27ppm H2O zero 0.8976 -> .8978 Offset: 1.3ppm H2O span 1.0141 -> 1.0296 Offset: -.31ppm Notes: |
| 2017-12-18 | 0035 | LI-7500A | Removed | Gas Analyzer CO2/H2O | Removed from Twitchell Alfalfa for calibration. Replaced by sn 75H-2514 |
| 2018-01-12 | 0035 | LI-7500A | Calibration | Lab | Last calibration: 2017-09-05 AGC=98.9 SDM=0 DAC1=0 DAC2=0 Ambient P=101.5kPa, Tair=20.5C, Tdew=10.2C Zero Air at 250psi, LBL Air 408.97 at 1700 Tdewspan=16.00 CO2 zero 0.9373 -> .9378 Offset: 1.97ppm CO2 span 1.0084 -> 1.0288 Offset: -10.27ppm H2O zero 0.8976 -> .8978 Offset: 1.3ppm H2O span 1.0141 -> 1.0296 Offset: -.31ppm Notes: |
| 2013-09-11 | 0065 | LI-7500A | Installed | Gas Analyzer CO2/H2O | installed on the Alfalfa tower to replace sn 2180 for calibration |
| 2014-04-02 | 0065 | LI-7500A | Calibration | Lab | Last calibration: 2013-09-11 AGC=73.1 SDM=1 DAC1=- DAC2=- Ambient P=100.27kPa, Tair=19.36C, Tdew=6.05C Zero Air at 1400psi, God CO2 421.22 at 1500 Tdewspan=15.27 CO2 zero 0.8897 -> 0.8899 Offset: .82ppm CO2 span 1.0041 -> 1.0062 Offset: -0.68ppm H2O zero 0.704 -> 0.7040 Offset: 0.2ppm H2O span 0.9959 -> 0.9932 Offset: 0.06ppm Notes: Calibrated by Joe |
| 2014-03-27 | 0065 | LI-7500A | Removed | Gas Analyzer CO2/H2O | Removed from the Twitchell Alfalfa tower for calibration. Replaced by sn 75H-2180. |
| 2014-04-02 | 0065 | LI-7500A | Calibration | Lab | Last calibration: 2013-09-11 AGC=73.1 SDM=1 DAC1=- DAC2=- Ambient P=100.27kPa, Tair=19.36C, Tdew=6.05C Zero Air at 1400psi, God CO2 421.22 at 1500 Tdewspan=15.27 CO2 zero 0.8897 -> 0.8899 Offset: .82ppm CO2 span 1.0041 -> 1.0062 Offset: -0.68ppm H2O zero 0.704 -> 0.7040 Offset: 0.2ppm H2O span 0.9959 -> 0.9932 Offset: 0.06ppm Notes: Calibrated by Joe |
| 2015-04-23 | 0065 | LI-7500A | Installed | Gas Analyzer CO2/H2O | Installed on the Alfalfa tower to replace sn 75H-2176 for calibration. |
| 2015-12-07 | 0065 | LI-7500A | Calibration | Lab | Last calibration: 2015-04-20 AGC=76.5 SDM=1 DAC1=- DAC2=- Ambient P=100.92kPa, Tair=19.81C, Tdew=14.18C Zero Air at 650psi, God CO2 421.22 at 700 Tdewspan=11.09 CO2 zero 0.8897 -> 0.8900 Offset: 1.20ppm CO2 span 1.0074 -> 1.0164 Offset: -4.88ppm H2O zero 0.7055 -> 0.7097 Offset: 31.2ppm H2O span 1.0071 -> 1.0231 Offset: -0.32ppm Notes: |
| 2015-07-22 | 0065 | LI-7500A | Removed | Gas Analyzer CO2/H2O | Removed from the Alfalfa Tower for calibration. Replaced by sn 75H-2150 |
| 2015-12-07 | 0065 | LI-7500A | Calibration | Lab | Last calibration: 2015-04-20 AGC=76.5 SDM=1 DAC1=- DAC2=- Ambient P=100.92kPa, Tair=19.81C, Tdew=14.18C Zero Air at 650psi, God CO2 421.22 at 700 Tdewspan=11.09 CO2 zero 0.8897 -> 0.8900 Offset: 1.20ppm CO2 span 1.0074 -> 1.0164 Offset: -4.88ppm H2O zero 0.7055 -> 0.7097 Offset: 31.2ppm H2O span 1.0071 -> 1.0231 Offset: -0.32ppm Notes: |
| 2015-11-25 | 1594 | LI-7500A | Installed | Gas Analyzer CO2/H2O | Installed on the Alfalfa Tower to replace sn 75H-2150 for calibration |
| 2016-02-11 | 1594 | LI-7500A | Removed | Gas Analyzer CO2/H2O | Removed from the Alfalfa Tower for calibration. Replaced by sn 75H-2180. |
| 2017-06-05 | 1594 | LI-7500A | Installed | Gas Analyzer CO2/H2O | Installed at Twitchell Alfalfa to replace sn 75H-2176. |
| 2017-09-06 | 1594 | LI-7500A | Removed | Gas Analyzer CO2/H2O | Removed from Twitchell Alfalfa for calibration. Replaced by sn 0035. |
| 2018-04-05 | 1594 | LI-7500A | Installed | Gas Analyzer CO2/H2O | Installed at TA to replace sn 75H-2514, which was brought back to the lab for calibration. |
| 2018-06-13 | 1594 | LI-7500A | Removed | Gas Analyzer CO2/H2O | Removed with Twitchell Alfalfa site decommissioning. |
| 2015-07-22 | 75H-2150 | LI-7500A | Installed | Gas Analyzer CO2/H2O | Installed on the Alfalfa Tower to replace sn 0065 for calibration. |
| 2015-12-07 | 75H-2150 | LI-7500A | Calibration | Lab | Last calibration: 2015-07-15 AGC=98.6 SDM=1 DAC1=- DAC2=- Ambient P=100.94kPa, Tair=19.78C, Tdew=12.44C Zero Air at 650psi, God CO2 421.22 at 700 Tdewspan=11.09 CO2 zero 0.9021 -> 0.9019 Offset: -1.16ppm CO2 span 1 -> 1.0114 Offset: -6.07ppm H2O zero 0.8671 -> 0.8671 Offset: 0.3ppm H2O span 0.9986 -> 1.0258 Offset: -0.52ppm Notes: |
| 2015-11-25 | 75H-2150 | LI-7500A | Removed | Gas Analyzer CO2/H2O | Removed from the Alfalfa Tower for calibration. Replaced by sn 1594 |
| 2015-12-07 | 75H-2150 | LI-7500A | Calibration | Lab | Last calibration: 2015-07-15 AGC=98.6 SDM=1 DAC1=- DAC2=- Ambient P=100.94kPa, Tair=19.78C, Tdew=12.44C Zero Air at 650psi, God CO2 421.22 at 700 Tdewspan=11.09 CO2 zero 0.9021 -> 0.9019 Offset: -1.16ppm CO2 span 1 -> 1.0114 Offset: -6.07ppm H2O zero 0.8671 -> 0.8671 Offset: 0.3ppm H2O span 0.9986 -> 1.0258 Offset: -0.52ppm Notes: |
| 2015-01-07 | 75H-2176 | LI-7500A | Installed | Gas Analyzer CO2/H2O | Installed on the Alfalfa Tower to replace sn 75H-2182 for calibration |
| 2015-05-05 | 75H-2176 | LI-7500A | Calibration | Lab | Last calibration: 2015-05-05 AGC=90.7 SDM=1 DAC1=- DAC2=- Ambient P=100.12kPa, Tair=14.62C, Tdew=8.08C Zero Air at 850psi, God CO2 421.22 at 1100 Tdewspan=11.08 CO2 zero 0.8691 -> 0.8692 Offset: .38ppm CO2 span 1.0215 -> 1.0216 Offset: 0.0ppm H2O zero 0.8559 -> 0.8562 Offset: 1.7ppm H2O span 1.0099 -> 1.0239 Offset: -0.27ppm Notes: |
| 2015-04-23 | 75H-2176 | LI-7500A | Removed | Gas Analyzer CO2/H2O | Removed from the Alfalfa tower for calibration. Replaced by sn 0065. |
| 2015-05-05 | 75H-2176 | LI-7500A | Calibration | Lab | Last calibration: 2015-05-05 AGC=90.7 SDM=1 DAC1=- DAC2=- Ambient P=100.12kPa, Tair=14.62C, Tdew=8.08C Zero Air at 850psi, God CO2 421.22 at 1100 Tdewspan=11.08 CO2 zero 0.8691 -> 0.8692 Offset: .38ppm CO2 span 1.0215 -> 1.0216 Offset: 0.0ppm H2O zero 0.8559 -> 0.8562 Offset: 1.7ppm H2O span 1.0099 -> 1.0239 Offset: -0.27ppm Notes: |
| 2017-03-08 | 75H-2176 | LI-7500A | Installed | Gas Analyzer CO2/H2O | Installed on Twitchell Alfalfa to replace sn 75H-2514 for calibration |
| 2017-06-12 | 75H-2176 | LI-7500A | Calibration | Lab | Last calibration: 2017-03-07 AGC=90.4 SDM= DAC1= DAC2= Ambient P=100.4kPa, Tair=19.8C, Tdew=8.83C Zero Air at 1500psi, NOAA Air 402.69 at 1600 Tdewspan=16.00 CO2 zero 0.8691 -> .8690 Offset: -.41ppm CO2 span 1.0195 -> 1.0160 Offset: 1.77ppm H2O zero 0.8561 -> .8572 Offset: 5.9ppm H2O span 1.0102 -> 1.0022 Offset: 0.18ppm Notes: |
| 2017-06-05 | 75H-2176 | LI-7500A | Removed | Gas Analyzer CO2/H2O | Removed from Twitchell Alfalfa and brought back to the lab for calibration. It was replaced by sn 1594. |
| 2017-06-12 | 75H-2176 | LI-7500A | Calibration | Lab | Last calibration: 2017-03-07 AGC=90.4 SDM= DAC1= DAC2= Ambient P=100.4kPa, Tair=19.8C, Tdew=8.83C Zero Air at 1500psi, NOAA Air 402.69 at 1600 Tdewspan=16.00 CO2 zero 0.8691 -> .8690 Offset: -.41ppm CO2 span 1.0195 -> 1.0160 Offset: 1.77ppm H2O zero 0.8561 -> .8572 Offset: 5.9ppm H2O span 1.0102 -> 1.0022 Offset: 0.18ppm Notes: |
| 2013-05-24 | 75H-2180 | LI-7500A | Installed | Gas Analyzer CO2/H2O | Installed on the northwest corner of the scaffolding at the Alfalfa site with box 0674 |
| 2013-11-20 | 75H-2180 | LI-7500A | Calibration | Lab | Last calibration: 2013-05-20 AGC=94 SDM=1 DAC1=- DAC2=- Ambient P=99.86kPa, Tair=20.06C, Tdew=12.68C Zero air at 1500psi, God CO2 421.22 at 1550 Tdewspan=15.18 CO2 zero 0.9133 -> 0.9148 Offset: 6.58ppm CO2 span 1.0091 -> 1.0156 Offset: -3.52ppm H2O zero 0.884 -> 0.8791 Offset: -28.4ppm H2O span 0.9991 -> 1.0019 Offset: 0.05ppm Notes: |
| 2013-09-11 | 75H-2180 | LI-7500A | Removed | Gas Analyzer CO2/H2O | Removed from the Alfalfa tower for calibration. Replaced by sn 0065. |
| 2013-11-20 | 75H-2180 | LI-7500A | Calibration | Lab | Last calibration: 2013-05-20 AGC=94 SDM=1 DAC1=- DAC2=- Ambient P=99.86kPa, Tair=20.06C, Tdew=12.68C Zero air at 1500psi, God CO2 421.22 at 1550 Tdewspan=15.18 CO2 zero 0.9133 -> 0.9148 Offset: 6.58ppm CO2 span 1.0091 -> 1.0156 Offset: -3.52ppm H2O zero 0.884 -> 0.8791 Offset: -28.4ppm H2O span 0.9991 -> 1.0019 Offset: 0.05ppm Notes: |
| 2014-03-27 | 75H-2180 | LI-7500A | Installed | Gas Analyzer CO2/H2O | Installed on the Twitchell Alfalfa tower to replace sn 0065 for calibration. |
| 2014-09-02 | 75H-2180 | LI-7500A | Calibration | Lab | Last calibration: 2014-03-26 AGC=94.8 SDM=1 DAC1=- DAC2=- Ambient P=99.73kPa, Tair=23.3C, Tdew=14.27C Zero Air at 1000psi, God CO2 421.22 at 1350 Tdewspan=15.25 CO2 zero 0.9147 -> 0.9143 Offset: -1.66ppm CO2 span 1.0173 -> 1.0134 Offset: 1.98ppm H2O zero 0.8803 -> 0.8812 Offset: 5.3ppm H2O span 0.9946 -> 1.0193 Offset: -0.5ppm Notes: |
| 2014-08-27 | 75H-2180 | LI-7500A | Removed | Gas Analyzer CO2/H2O | Removed from the Twitchell Alfalfa tower for calibration. Replaced by sn 75H-2182. |
| 2014-09-02 | 75H-2180 | LI-7500A | Calibration | Lab | Last calibration: 2014-03-26 AGC=94.8 SDM=1 DAC1=- DAC2=- Ambient P=99.73kPa, Tair=23.3C, Tdew=14.27C Zero Air at 1000psi, God CO2 421.22 at 1350 Tdewspan=15.25 CO2 zero 0.9147 -> 0.9143 Offset: -1.66ppm CO2 span 1.0173 -> 1.0134 Offset: 1.98ppm H2O zero 0.8803 -> 0.8812 Offset: 5.3ppm H2O span 0.9946 -> 1.0193 Offset: -0.5ppm Notes: |
| 2016-02-11 | 75H-2180 | LI-7500A | Installed | Gas Analyzer CO2/H2O | Installed on the Alfalfa Tower to replace sn 1594 for calibration. |
| 2016-08-30 | 75H-2180 | LI-7500A | Calibration | Lab | Last calibration: 2016-02-09 AGC=100.3 SDM=6 DAC1=- DAC2=- Ambient P=100.13kPa, Tair=23.80C, Tdew=13.90C Zero Air at 400psi, God CO2 421.22 at 450 Tdewspan=16.0 CO2 zero 0.9145 -> 0.9142 Offset: -1.25ppm CO2 span 1.0203 -> 1.0227 Offset: -1.22ppm H2O zero 0.8847 -> 0.8858 Offset: 7.0ppm H2O span 1.0241 -> 1.0211 Offset: 0.06ppm Notes: |
| 2016-06-06 | 75H-2180 | LI-7500A | Removed | Gas Analyzer CO2/H2O | Removed from tower in Twitchell alfalfa for calibration, replaced by sn 75H-2514. |
| 2016-08-30 | 75H-2180 | LI-7500A | Calibration | Lab | Last calibration: 2016-02-09 AGC=100.3 SDM=6 DAC1=- DAC2=- Ambient P=100.13kPa, Tair=23.80C, Tdew=13.90C Zero Air at 400psi, God CO2 421.22 at 450 Tdewspan=16.0 CO2 zero 0.9145 -> 0.9142 Offset: -1.25ppm CO2 span 1.0203 -> 1.0227 Offset: -1.22ppm H2O zero 0.8847 -> 0.8858 Offset: 7.0ppm H2O span 1.0241 -> 1.0211 Offset: 0.06ppm Notes: |
| 2014-08-27 | 75H-2182 | LI-7500A | Installed | Gas Analyzer CO2/H2O | Installed on the Twitchell Alfalfa tower to replace sn 75H-2180 for calibration. |
| 2015-01-13 | 75H-2182 | LI-7500A | Calibration | Lab | Last calibration: 2014-08-25 AGC=85.3 SDM=- DAC1=- DAC2=- Ambient P=101.1kPa, Tair=25.52C, Tdew=8.45C Zero Air at 900psi, God CO2 421.22 at 1300 Tdewspan=15.95 CO2 zero 0.8816 -> 0.8824 Offset: 3.53ppm CO2 span 1.0074 -> 1.0118 Offset: -2.38ppm H2O zero 0.8463 -> 0.8453 Offset: -6.2ppm H2O span 1.0039 -> 1.0078 Offset: -0.08ppm Notes: |
| 2015-01-07 | 75H-2182 | LI-7500A | Removed | Gas Analyzer CO2/H2O | Removed from Alfalfa Tower for calibration. Replaced with sn 75H-2176 |
| 2015-01-13 | 75H-2182 | LI-7500A | Calibration | Lab | Last calibration: 2014-08-25 AGC=85.3 SDM=- DAC1=- DAC2=- Ambient P=101.1kPa, Tair=25.52C, Tdew=8.45C Zero Air at 900psi, God CO2 421.22 at 1300 Tdewspan=15.95 CO2 zero 0.8816 -> 0.8824 Offset: 3.53ppm CO2 span 1.0074 -> 1.0118 Offset: -2.38ppm H2O zero 0.8463 -> 0.8453 Offset: -6.2ppm H2O span 1.0039 -> 1.0078 Offset: -0.08ppm Notes: |
| 2016-08-31 | 75H-2182 | LI-7500A | Installed | Gas Analyzer CO2/H2O | Installed on the Twitchell Alfalfa tower to replace sn 75H-2514 for calibration. |
| 2016-12-06 | 75H-2182 | LI-7500A | Calibration | Lab | Removed from the Twitchell Alfalfa tower for calibration. Replaced by sn 75H-2668. |
| 2016-12-06 | 75H-2182 | LI-7500A | Calibration | Gas Analyzer CO2/H2O | Removed from the Twitchell Alfalfa tower for calibration. Replaced by sn 75H-2668. |
| 2016-12-19 | 75H-2182 | LI-7500A | Calibration | Lab | Last calibration: 2016-08-30 AGC=87.2 SDM=6 DAC1=- DAC2=- Ambient P=101.31kPa, Tair=20.29C, Tdew=-0.86C Zero Air at 300psi, God CO2 421.22 at 400 Tdewspan=16.00 CO2 zero 0.8831 -> 0.8837 Offset: 2.75ppm CO2 span 1.0142 -> 1.0207 Offset: -3.48ppm H2O zero 0.8464 -> 0.8457 Offset: -4.2ppm H2O span 1.023 -> 1.0186 Offset: 0.09ppm Notes: |
| 2016-06-06 | 75H-2514 | LI-7500A | Installed | Gas Analyzer CO2/H2O | Installed at Twitchell alfalfa to replace sn 75H-2180 for calibration. |
| 2016-09-12 | 75H-2514 | LI-7500A | Calibration | Lab | Last calibration: 2016-06-03 AGC=103.2 SDM=6 DAC1=- DAC2=- Ambient P=99.87kPa, Tair=18.64C, Tdew=9.66C Zero Air at 400psi, God CO2 421.22 at 400 Tdewspan=16.0 CO2 zero 0.9047 -> 0.9054 Offset: 2.80ppm CO2 span 1.0055 -> 1.0092 Offset: -2.07ppm H2O zero 0.8368 -> 0.8371 Offset: -10.5ppm H2O span 1.015 -> 1.0239 Offset: -0.18ppm Notes: |
| 2016-08-31 | 75H-2514 | LI-7500A | Removed | Gas Analyzer CO2/H2O | Removed from the Twitchell Alfalfa tower for calibration. Replaced by sn 75H-2182 |
| 2016-09-12 | 75H-2514 | LI-7500A | Calibration | Lab | Last calibration: 2016-06-03 AGC=103.2 SDM=6 DAC1=- DAC2=- Ambient P=99.87kPa, Tair=18.64C, Tdew=9.66C Zero Air at 400psi, God CO2 421.22 at 400 Tdewspan=16.0 CO2 zero 0.9047 -> 0.9054 Offset: 2.80ppm CO2 span 1.0055 -> 1.0092 Offset: -2.07ppm H2O zero 0.8368 -> 0.8371 Offset: -10.5ppm H2O span 1.015 -> 1.0239 Offset: -0.18ppm Notes: |
| 2016-12-29 | 75H-2514 | LI-7500A | Installed | Gas Analyzer CO2/H2O | Installed at Twitchell Alfalfa with new 7550 box sn AIU-1557 to replace damaged system |
| 2017-03-14 | 75H-2514 | LI-7500A | Calibration | Lab | Last calibration: 2017-01-03 AGC=88.6 SDM= DAC1= DAC2= Ambient P=100.2kPa, Tair=28.4C, Tdew=5.92C Zero Air at 1700psi, God CO2 421.22 at 400 Tdewspan=16.00 CO2 zero 0.9054 -> 0.9046 Offset: -2.87ppm CO2 span 1.0135 -> 1.0139 Offset: 0.34ppm H2O zero 0.8356 -> 0.8368 Offset: 9.3ppm H2O span 1.0225 -> 1.0106 Offset: 0.25ppm Notes: |
| 2017-03-08 | 75H-2514 | LI-7500A | Removed | Gas Analyzer CO2/H2O | Removed from Twitchell Alfalfa for calibration. Replaced by sn 75H-2176 |
| 2017-03-14 | 75H-2514 | LI-7500A | Calibration | Lab | Last calibration: 2017-01-03 AGC=88.6 SDM= DAC1= DAC2= Ambient P=100.2kPa, Tair=28.4C, Tdew=5.92C Zero Air at 1700psi, God CO2 421.22 at 400 Tdewspan=16.00 CO2 zero 0.9054 -> 0.9046 Offset: -2.87ppm CO2 span 1.0135 -> 1.0139 Offset: 0.34ppm H2O zero 0.8356 -> 0.8368 Offset: 9.3ppm H2O span 1.0225 -> 1.0106 Offset: 0.25ppm Notes: |
| 2017-12-18 | 75H-2514 | LI-7500A | Installed | Gas Analyzer CO2/H2O | Installed at Twitchell Alfalfa to replace sn 0035 for calibration |
| 2018-04-18 | 75H-2514 | LI-7500A | Calibration | Lab | Last calibration: 2017-12-15 AGC=102.5 SDM=0 DAC1=0 DAC2=0 Ambient P=101.0kPa, Tair=22.2C, Tdew=2.5C Zero Air at 500psi, LBL Air 408.97 at 1400 Tdewspan=16.00 CO2 zero 0.9052 -> .9060 Offset: 3.56ppm CO2 span 1.0118 -> 1.0106 Offset: 0.64ppm H2O zero 0.8385 -> .8368 Offset: -11.4ppm H2O span 1.0103 -> 1.0160 Offset: -0.12ppm Notes: |
| 2018-04-05 | 75H-2514 | LI-7500A | Removed | Gas Analyzer CO2/H2O | Removed from TA and brought back to the lab for calibration. It was replaced by sn 1594. |
| 2018-04-18 | 75H-2514 | LI-7500A | Calibration | Lab | Last calibration: 2017-12-15 AGC=102.5 SDM=0 DAC1=0 DAC2=0 Ambient P=101.0kPa, Tair=22.2C, Tdew=2.5C Zero Air at 500psi, LBL Air 408.97 at 1400 Tdewspan=16.00 CO2 zero 0.9052 -> .9060 Offset: 3.56ppm CO2 span 1.0118 -> 1.0106 Offset: 0.64ppm H2O zero 0.8385 -> .8368 Offset: -11.4ppm H2O span 1.0103 -> 1.0160 Offset: -0.12ppm Notes: |
| 2016-12-06 | 75H-2668 | LI-7500A | Installed | Gas Analyzer CO2/H2O | Installed on the Twitchell Alfalfa tower to replace sn 75H-2182 for calibration |
| 2016-12-23 | 75H-2668 | LI-7500A | Calibration | Lab | Last calibration: 2016-12-06 AGC=102.2 SDM=6 DAC1=- DAC2=- Ambient P=99.57kPa, Tair=14.95C, Tdew=C Zero Air at 300psi, God CO2 421.22 at 400 Tdewspan=14.00 CO2 zero 0.9385 -> 0.9378 Offset: -2.65ppm CO2 span 1.0171 -> 1.0000 Offset: 9.43ppm H2O zero 0.9017 -> 0.9006 Offset: -7.5ppm H2O span 1.0841 -> 0.9663 Offset: 2.45ppm Notes: Recal after box failed in the field after getting rain inside because the door was left open. Pressure about 0.5kPa low. Large offsets. Waves with 1 to 2 min period in data at steady state. Sending to licor for check. |
| 2016-12-21 | 75H-2668 | LI-7500A | Removed | Gas Analyzer CO2/H2O | This head was deployed with LI7550 box sn AIU-0674 when the box was damaged in the field. Could not determine in the field if the head was working so brought it back to the lab for testing. |
| 2016-12-23 | 75H-2668 | LI-7500A | Calibration | Lab | Last calibration: 2016-12-06 AGC=102.2 SDM=6 DAC1=- DAC2=- Ambient P=99.57kPa, Tair=14.95C, Tdew=C Zero Air at 300psi, God CO2 421.22 at 400 Tdewspan=14.00 CO2 zero 0.9385 -> 0.9378 Offset: -2.65ppm CO2 span 1.0171 -> 1.0000 Offset: 9.43ppm H2O zero 0.9017 -> 0.9006 Offset: -7.5ppm H2O span 1.0841 -> 0.9663 Offset: 2.45ppm Notes: Recal after box failed in the field after getting rain inside because the door was left open. Pressure about 0.5kPa low. Large offsets. Waves with 1 to 2 min period in data at steady state. Sending to licor for check. |
| 2013-08-28 | TG1-0155 | LI-7700 | Installed | Gas Analyzer CH4 | Installed on the Twitchell Alfalfa tower with washer box. Plugged in to the existing 7550 box. |
| 2014-02-25 | TG1-0155 | LI-7700 | Removed | Gas Analyzer CH4 | Removed from the Alfalfa tower along with its wash box to be installed on the East End Tower to replace sn TG1-0203 that was returned to Frank |
| 2014-02-25 | TG1-0155 | LI-7700 | Installed | Gas Analyzer CH4 | Installed on the East End Tower with its wash box to replace sn TG1-0203 that was returned to Frank. This instrument came directly from Alfalfa. |