Equipment and Calibration History
History for Licor LI-7500A 75H-2668
| Rec No. | Date | Loc From | Title | Loc To | Notes |
|---|---|---|---|---|---|
| 4594 | 2020-07-09 | Loaned | Disposed | Disposed | Given to Sabina of Hydrofocus. The DWR grant ended at the end of June 2020, and Bryan requested we hand off a tower to Hydrofocus. |
| 4564 | 2020-07-09 | Sherman Barn Gas Analyzer CO2/H2O | Removed | Loaned none | Removed from Sherman Barn with its decommissioning and given to Sabina of Hydrofocus. The DWR grant ended at the end of June 2020, and Bryan requested we hand off a tower to Hydrofocus. |
| 4497 | 2020-05-21 | Lab none | Installed | Sherman Barn Gas Analyzer CO2/H2O | Installed at Sherman Barn to replace sn 75H-2669 for calibration. |
| 4482 | 2020-05-20 | Lab | Calibration | Lab none | Last calibration: 2020-02-11
AGC=100.3 SDM=0 DAC1=- DAC2=- Ambient P=100.9kPa, Tair=20.4C, Tdew=9.7C Zero Air at 800psi, AMP CA04396 408.97 at 600 Tdewspan=16.0 CO2 zero 0.9393 -> 0.9390 Offset: -1.3ppm CO2 span 1.0171 -> 1.0198 Offset: -1.37ppm H2O zero 0.9072 -> 0.9082 Offset: 5.7ppm H2O span 1.0147 -> 1.0119 Offset: 0.05ppm Notes: |
| 4468 | 2020-05-19 | Bouldin Corn | Removed | Lab none | Removed from Bouldin Corn and brought back to the lab for calibration. It was replaced by sn 75H-2176. |
| 4380 | 2020-02-20 | Lab none | Installed | Bouldin Corn Gas Analyzer CO2/H2O | Installed at Bouldin Corn to replace sn 0042 for calibration. |
| 4369 | 2020-02-11 | Lab | Calibration | Lab | Last calibration: 2019-10-30 AGC=100.4 SDM=0 DAC1=- DAC2=- Ambient P=100.8kPa, Tair=26.9C, Tdew=-1.59C Zero Air at 800psi, AMP CA04396 408.97 at 550 Tdewspan=16.0 CO2 zero 0.9393 -> 0.9393 Offset: -0.1ppm CO2 span 1.016 -> 1.0171 Offset: -0.94ppm H2O zero 0.9096 -> 0.9072 Offset: 2.7ppm H2O span 1.0143 -> 1.0147 Offset: -0.01ppm Notes: Ambient air very dry |
| 4364 | 2020-02-06 | Sherman Barn Gas Analyzer CO2/H2O | Removed | Lab none | Removed from Sherman Barn and brought back to the lab for calibration. Replaced by sn 75H-2669. |
| 4133 | 2019-10-31 | Lab none | Installed | Sherman Barn Gas Analyzer CO2/H2O | Installed at Sherman Barn to replace sn 75H-2667 for calibration. |
| 4128 | 2019-10-30 | Lab none | Calibration | Lab none | Last calibration: 2019-04-26 AGC=100.3 SDM=0 DAC1=- DAC2=- Ambient P=101.0kPa, Tair=26.9C, Tdew=-10.7C Zero Air at 900psi, AMP CA04396 408.97 at 800 Tdewspan=20.0 CO2 zero 0.9391 -> 0.9393 Offset: 1.05ppm CO2 span 1.0169 -> 1.0160 Offset: 0.53ppm H2O zero 0.9069 -> 0.9096 Offset: -0.9ppm H2O span 1.0139 -> 1.0143 Offset: 0ppm Notes: Ambient air was very dry. Joe |
| 4066 | 2019-08-22 | Vaira Gas Analyzer CO2/H2O | Removed | Lab none | Removed from Vaira for calibration. Replaced by sn 0418. |
| 3971 | 2019-04-30 | Lab none | Installed | Vaira Gas Analyzer CO2/H2O | Installed on the Vaira tower to replace sn 74H-2176 for calibration. |
| 3937 | 2019-04-26 | Lab none | Calibration | Lab none | 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: |
| 3947 | 2019-04-25 | West Pond Gas Analyzer CO2/H2O | Removed | Lab none | Removed from West Pond for calibration. Replaced by sn 0418 |
| 3880 | 2019-02-12 | Lab none | Installed | West Pond Gas Analyzer CO2/H2O | Installed at WP to replace 75H-2182, which was brought back to the lab for calibration. |
| 3878 | 2019-02-11 | Lab none | Calibration | Lab none | Last calibration: 2018-10-08 AGC=99 SDM=0 DAC1=0 DAC2=0 Ambient P=101.1kPa, Tair=22.5C, Tdew=3.7C Zero Air at 1150psi, AMP Air 408.97 at 800 Tdewspan=16.00 CO2 zero 0.9394 -> .939 Offset: -1.51ppm CO2 span 1.0164 -> .018 Offset: -.81ppm H2O zero 0.9057 -> .9073 Offset: 8.8ppm H2O span 1.0157 -> 1.0117 Offset: 0.08ppm Notes: Dewpoint generator dewpoint kept falling b/c it was low on water. I added more DI water and it seemed fine. |
| 3871 | 2019-01-31 | Bouldin Corn Gas Analyzer CO2/H2O | Removed | Lab none | Removed from BC and brought back to the lab for calibration. It was replaced by sn 1594. |
| 3744 | 2018-10-18 | Lab none | Installed | Bouldin Corn Gas Analyzer CO2/H2O | Installed on Bouldin Corn to replace sn 75H-2182 for calibration |
| 3730 | 2018-10-08 | Lab none | Calibration | Lab none | Last calibration: 2018-10-02 AGC=101 SDM=0 DAC1=0 DAC2=0 Ambient P=99.9kPa, Tair=29.3C, Tdew=5.8C Zero Air at 1500psi, AMP Air 408.97 at 1200 Tdewspan=16.00 CO2 zero 0.9389 -> .9394 Offset: 2.06ppm CO2 span 1.0172 -> 1.0164 Offset: .38ppm H2O zero 0.9072 -> .9057 Offset: -8.2ppm H2O span 1.0238 -> 1.0157 Offset: .17ppm Notes: Second calibration since chemical swap. Sensor had been running for 5 days, since 10/3 when it had a huge H2O zero offset when analyzing zero gas. I'm not sure why it was reading weird values on 10/3, but the numbers seem ok today, consistent with a chemical swap. In the future, we should let the sensor run for 1 week after swapping internal chemicals, rather than calibrating after only 24 hours. |
| 3721 | 2018-10-03 | Lab none | Tested | Lab none | Tested with zero air and the most recent configuration file from 2018-10-02, but CO2 was reading 7.2 umol/mol and H2O was reading -50 mmol/m3. I'm going to let it run a few more days before checking again. |
| 3720 | 2018-10-02 | Lab none | Calibration | Lab none | Last calibration: 2018-09-26 AGC=101 SDM=0 DAC1=0 DAC2=0 Ambient P=99.9kPa, Tair=26.8C, Tdew=15.9C Zero Air at 1600psi, AMP Air 408.97 at 1200 Tdewspan=20.00 CO2 zero 0.9392 -> .9389 Offset: -1.47ppm CO2 span 1.0153 -> 1.0172 Offset: -1.09ppm H2O zero 0.9056 -> .9072 Offset: 9.2ppm H2O span 1.0166 -> 1.0238 Offset: -.16ppm Notes: First calibration after swapping out internal chemicals. Kept the sensor on for 3 days after the swap before the calibration. |
| 3715 | 2018-09-28 | Lab none | Maintenance | Lab none | Swapped out internal chemicals (Ascarite II and Mg(ClO4)2) because the last three calibrations have H2O zero offsets of +/-10 deg C, which is larger than expected. I flushed the analyzer housing with zero air for a few minutes before replacing the chemical bottles. |
| 3704 | 2018-09-26 | Lab none | Calibration | Lab none | Last calibration: 2018-04-04 AGC=100.0 SDM=0 DAC1=0 DAC2=0 Ambient P=100.4kPa, Tair=26.5C, Tdew=13.8C Zero Air at 1600psi, AMP Air 408.97 at 1200 Tdewspan=16.00 CO2 zero 0.9393 -> 0.9392 Offset: -.27ppm CO2 span 1.0147 -> 1.0153 Offset: -.27ppm H2O zero 0.9038 -> .9056 Offset: 10.6ppm H2O span 1.0146 -> 1.0166 Offset: .05ppm Notes: "Check PLL" error for the first 30 seconds, then status changed to "OK." |
| 3588 | 2018-07-12 | Bouldin Corn Gas Analyzer CO2/H2O | Removed | Lab none | Removed from BC and brought back to the lab for calibration. It was replaced by sn 75H-2182. |
| 3383 | 2018-04-05 | Lab none | Installed | Bouldin Corn Gas Analyzer CO2/H2O | Installed at BC to replace sn 0035, which was brought back to the lab for calibration. |
| 3378 | 2018-04-04 | Lab none | Calibration | Lab none | Last calibration: 2017-11-28 AGC=100.3 SDM=0 DAC1=0 DAC2=0 Ambient P=100.9kPa, Tair=21.7C, Tdew=8.5C Zero Air at 100psi, LBL Air 408.97 at 1700 Tdewspan=16.00 CO2 zero 0.9392 -> .9393 Offset: .46ppm CO2 span 1.0147 -> 1.0147 Offset: -.1ppm H2O zero 0.9066 -> .9038 Offset: -15.5ppm H2O span 1.0125 -> 1.0146 Offset: -.04ppm Notes: Calibrated on LI-7550 sn 674 with 8.5.0 embedded software version. Large H2O offset but last calibration, the offset was +11 mmol/m3 (similar magnitude and opposite sign), so I think it's ok, maybe something wonky last calibration. |
| 3371 | 2018-03-06 | Tonzi-Tower Gas Analyzer CO2/H2O | Removed | Lab none | Removed from Tonzi Tower and brought back to the lab for calibration. It was replaced by sn 0041. |
| 3213 | 2017-11-29 | Lab Gas Analyzer CO2/H2O Floor | Installed | Tonzi-Tower Gas Analyzer CO2/H2O Floor | Installed on the Tonzi Tower to replace sn 75H-2182 for calibration. |
| 3204 | 2017-11-28 | Lab none | Calibration | Lab none | Last calibration: 2017-07-25 AGC=99.9 SDM=0 DAC1=0 DAC2=0 Ambient P=100.6kPa, Tair=21.7C, Tdew=8.9C Zero Air at 300psi, LBL Air 408.97 at 1700 Tdewspan=16.00 CO2 zero 0.9395 -> .9392 Offset: -1.56ppm CO2 span 1.0159 -> 1.0147 Offset: 0.64ppm H2O zero 0.9047 -> 0.9066 Offset: 11.0ppm H2O span 1.0107 -> 1.0125 Offset: -0.04ppm Notes: Calibrated on 7550 software version 8.7.5 |
| 3155 | 2017-10-19 | Bouldin Corn Gas Analyzer CO2/H2O | Removed | Lab none | Removed from Bouldin Corn for calibration. Replaced by sn 1594 |
| 2939 | 2017-07-26 | Lab none | Installed | Bouldin Corn Gas Analyzer CO2/H2O | Replaced 75H-2182. |
| 2936 | 2017-07-25 | Lab none | Calibration | Lab none | 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: |
| 2917 | 2017-07-03 | West Pond Gas Analyzer CO2/H2O | Removed | Lab none | Removed from West Pond for calibration. Replaced by 75H-0418. |
| 2846 | 2017-06-23 | West Pond Gas Analyzer CO2/H2O | Adjusted | West Pond Gas Analyzer CO2/H2O | Slated to be removed for calibration but replacement 75H-0418 measured unreasonable H20 levels. |
| 2653 | 2017-03-15 | Lab none | Installed | West Pond Gas Analyzer CO2/H2O | Installed at West Pond to replace 75H-2667. |
| 2649 | 2017-03-14 | Lab none | Calibration | Lab none | Last calibration: 2017-01-30 AGC=99.6 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=28.2C, Tdew=12.8C Zero Air at 1700psi, God Air 421.22 at 400 Tdewspan=16.00 CO2 zero 0.9392 -> 0.9392 Offset: 0.11ppm CO2 span 1.012 -> 1.0131 Offset: 0.57ppm H2O zero 0.9039 -> 0.9041 Offset: 1.0ppm H2O span 1.0054 -> 1.0063 Offset: .01ppm Notes: This sensor has been upgraded to firmware version 8.5.0. I connected it to Licor box sn AIU-0674 and used software version 8.5.0 to calibrate this sensor in order to calibrate the temperature coefficients (these coefficients are not calibrated in software version 8.0.0). |
| 2617 | 2017-02-13 | Factory | Returned | Lab none | Returned from Licor after repair on 7550 box and calibration. |
| 2616 | 2017-01-30 | Lab none | Calibration | Lab none | Last calibration: 2016-12-23 AGC= SDM= DAC1= DAC2= Ambient P=kPa, Tair=C, Tdew=C at psi, Licor CO2 at 749 Tdewspan=12 CO2 zero 0.9378 -> 0.9392 Offset: ppm CO2 span 1 -> 1.0120 Offset: ppm H2O zero 0.9006 -> 0.9039 Offset: ppm H2O span 0.9663 -> 1.0054 Offset: ppm Notes: Factory calibration after repair of 7550 box and upgrade to embedded software v8.5.0 |
| 2578 | 2017-01-05 | Lab none | Shipped | Factory | Sent to Licor on RMA 00199505 with AIU-0674. This head was on the box when its door was left open in the field and got rain inside. Subsequent lab calibration looked a little funny so it was sent with the box to Licor for a check. |
| 2563 | 2016-12-23 | Lab none | Calibration | Lab none | 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. |
| 2560 | 2016-12-21 | Twitchell Alfalfa Gas Analyzer CO2/H2O | Removed | Lab none | 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. |
| 2537 | 2016-12-06 | Lab none | Installed | Twitchell Alfalfa Gas Analyzer CO2/H2O | Installed on the Twitchell Alfalfa tower to replace sn 75H-2182 for calibration |
| 2529 | 2016-12-06 | Lab none | Calibration | Lab none | Last calibration: 2016-05-20 AGC=103.3 SDM=6 DAC1= DAC2= Ambient P=100.29kPa, Tair=15.36C, Tdew=3.00C Zero Air at 350psi, God CO2 421.22 at 400 Tdewspan=16.02 CO2 zero 0.9385 -> 0.9385 Offset: 0.0ppm CO2 span 1.0136 -> 1.0171 Offset: -1.92ppm H2O zero 0.8969 -> 0.9017 Offset: 30.2ppm H2O span 1.0146 -> 1.0841 Offset: -1.41ppm Notes: |
| 2474 | 2016-09-29 | Sherman Wetland Gas Analyzer CO2/H2O | Removed | Lab none | Removed from the Sherman Wetland tower for calibration. Replaced by sn 1594. |
| 2284 | 2016-05-24 | Lab none | Installed | Sherman Wetland Gas Analyzer CO2/H2O | Installed on the Sherman Wetland tower at the initial set up of the site. |
| 2277 | 2016-05-20 | Lab none | Upgrade | Lab none | Upgraded embedded software from 7.5.0 to 8.0.0 |
| 2275 | 2016-05-20 | Lab none | Calibration | Lab none | Last calibration: 2015-07-22 (Factory) AGC=100.22 SDM= DAC1= DAC2= Ambient P=100.03kPa, Tair=21.23C, Tdew=9.06C Zero Air at 600psi, NOAA "Good Co2" 421.22 at 500 Tdewspan=15.09 CO2 zero 0.9380 -> 0.9385 Offset: 1.79ppm CO2 span 1.0021 -> 1.0136 Offset: 6.22ppm H2O zero 0.8966 -> 0.8969 Offset: 1.4ppm H2O span 1.0037 -> 1.0146 Offset: 0.23ppm Notes: Upgraded from 7.5.0 to 8.0.0 embedded software. Last calibration was Factory - all setting from Factory cal were saved. Factory cal done at 749.7 ppm and 11.98 degC. |