Equipment and Calibration
View History
Equipment Entry
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Documents
Manual: LI-7500A_Manual_V1_200912.pdfManual: LI-7500A_Manual_v2_201104.pdf
Manual: LI-7500A_Manual_V4_201303.pdf
Manual: LI-7500A_Manual_V5_201310.pdf
History
| Rec No. | Date | Loc From | Title | Loc To | Notes |
|---|---|---|---|---|---|
| 6836 | 2024-09-03 | Lab none | Calibration | Loaned none | Last calibration: 2024-06-14
AGC=103 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.21kPa, Tair=26.14C, Tdew=14.36C Zero Air at 1350psi, AMP CA03923 488.75 at 1450 Tdewspan=20.00 CO2 zero 0.9036 -> .9026 Offset: -4.89ppm CO2 span 1.026 -> 1.0162 Offset: 6.1ppm H2O zero 0.8737 -> .8716 Offset: -15.1ppm H2O span 1.0443 -> 1.0188 Offset: .57ppm Notes: Larger offsets than usual but I think it's ok because it's the first calibration after swapping internal chemicals and running the sensor on the bench for 5 days. Used 488.7 as the span point in the software. Installed back on BWW tower after calibration. |
| 6834 | 2024-08-29 | Loaned none | Maintenance | Lab none | Removed from BWW tower and replaced the internal chemicals (they seemed fine). I broke off knurled screw inside the cap holding the internal chemicals bottle in place. I will run the sensor for a week and calibrate it next Tuesday to put it back up on BWW. The bottom plate is all flaky and there are some small cracks in the paint on the spars. I painted the spars with white nail polish.
The HMP fan on the BWW tower was not working and I replaced it today with a new fan and screw terminal and stripped back the power cable. |
| 6735 | 2024-06-14 | Lab | Calibration | Lab | Last calibration: 2024-02-26 AGC=103.7 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.49kPa, Tair=20.31C, Tdew=10.06C Zero Air at 200psi, AMP CA04119 524.77 at 375 Tdewspan=16.00 CO2 zero 0.903 -> .9036 Offset: 3.15ppm CO2 span 1.0175 -> 1.0260 Offset: -6.59ppm H2O zero 0.8737 -> .8737 Offset: .6ppm H2O span 1.0382 -> 1.0443 Offset: -.11ppm Notes: BWW tower sensor. The 7500 is a bit loose on its mount but the screws can't be tightened further. I used 524.67 as the span point in the software to make the post-span value = 524.77. Confirmed the HMP fan was working. |
| 6574 | 2024-02-26 | Lab | Calibration | Lab | Last calibration: 2023-11-09 AGC=102.8 SDM= DAC1= DAC2= AIU sn AIU-1866, Presure A0=58.31, A1=15.48 Ambient P=100.4kPa, Tair=24.1C, Tdew=10.96C Zero Air at 350psi, AMP CA04119 575 at 524.77 Tdewspan=20.00 CO2 zero 0.9041 -> .9030 Offset: -5.59ppm CO2 span 1.018 -> 1.0175 Offset: .48ppm H2O zero 0.8731 -> .8737 Offset: 3.5ppm H2O span 1.0265 -> 1.0382 Offset: -.25ppm Notes: BWW tower sensor. One of the mount screws wouldn't come out initially; Joe got it out pulsing with vice grips + WD-40. He cleaned out the white dust inside the bolt holes with a thread cutter. He sprayed the bolts and bolt holes with a anti-corrosion spray before I installed it again. The 7550 temperature sensor was bad. I replaced with a repaired homemade temperature sensor. The HMP fan was not spinning, but it seemed to work fine after I removed a bit of fluff. |
| 6470 | 2023-11-09 | Lab | Calibration | Lab | Last calibration: 2023-08-04 AGC=97.0 SDM= DAC1= DAC2= AIU sn AIU-1039, Presure A0=58.372, A1=15.4 Ambient P=101.1kPa, Tair=22.35C, Tdew=7.4C Zero Air at 650psi, AMP CA04119 524.77 at 775 Tdewspan=20.00 CO2 zero 0.9031 -> .9041 Offset: 4.64ppm CO2 span 1.0207 -> 1.018 Offset: 1.96ppm H2O zero 0.873 -> .8731 Offset: .6ppm H2O span 1.0346 -> 1.0265 Offset: .18ppm Notes: Using loner AMP 7550 box. Removed and re-installed on BWW tower on the same day. At the BWW tower, I refilled the wash reservoir (it was empty) and checked the HMP fan (it was working, just quiet). |
| 6359 | 2023-08-08 | Lab | Calibration | Lab | Last calibration: 2023-02-02 AGC=101.5 SDM= DAC1= DAC2= AIU sn AIU-1569, Presure A0=58.004, A1=15.479 Ambient P=100.6kPa, Tair=21.3C, Tdew=13.6C Zero Air at 900psi, AMP CA04119 524.77 at 875 Tdewspan=16.00 CO2 zero 0.9035 -> .9031 Offset: -1.63ppm CO2 span 1.0257 -> 1.0207 Offset: 3.59ppm H2O zero 0.8731 -> .873 Offset: -.4ppm H2O span 1.0331 -> 1.0346 Offset: -.02ppm Notes: First calibration in 6 months. Sensor installed on BWW tower and spars very dirty. Vertical orientation |
| 6183 | 2023-02-02 | Lab none | Calibration | Lab none | Last calibration: 2022-03-02
AGC=101.8 SDM= DAC1= DAC2= Ambient P=101.3kPa, Tair=17.9C, Tdew=4.5C Zero Air at 1400psi, AMP CA04119 524.77 at 1250 Tdewspan=16.00 CO2 zero 0.9016 -> 0.9035 Offset: 7.88ppm CO2 span 1.0075 -> 1.0257 Offset: -12.34ppm H2O zero 0.8707 -> .8731 Offset: 16.0ppm H2O span 1.0158 -> 1.0331 Offset: -.36ppm Notes: First calibration in 11 months. Sensor installed on BWW urban tower for the past 10 months. Sensor removed this morning and will go back up on the BWW urban tower this afternoon. I updated the calibration coefficients directly on the BWW computer instead of uploading the new config file. I also swapped the HMP fan its screw terminal that was all corroded. |
| 5715 | 2022-03-07 | Lab none | Installed | Loaned none | Installed on the urban flux tower on top of Berkeley Way West building |
| 5704 | 2022-03-02 | Lab | 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. |
| 5663 | 2022-01-20 | West Pond Gas Analyzer CO2/H2O | Removed | Lab none | Removed from West Pond for calibration. Replaced by sn 0035. |
| 5487 | 2021-10-07 | Lab none | Installed | West Pond Gas Analyzer CO2/H2O | Installed at West Pond to replace sn 75H-2182 for calibration. |
| 5473 | 2021-09-29 | Lab | Calibration | Lab | Last calibration: 2021-06-07 AGC=100 SDM= DAC1= DAC2= Ambient P=100.4kPa, Tair=26.3C, Tdew=9.07C Zero Air at 1425psi, AMP CA04119 524.77 at 1700 Tdewspan=20.00 CO2 zero 0.9024 -> .9018 Offset: -2.57ppm CO2 span 1.0107 -> 1.0034 Offset: 5.1ppm H2O zero 0.8687 -> .8689 Offset: 1.1ppm H2O span 1.0111 -> 1.0112 Offset: -.01ppm Notes: |
| 5470 | 2021-09-23 | Bouldin Corn Gas Analyzer CO2/H2O | Removed | Lab none | Removed from Bouldin Corn for calibration. Replaced by sn 0041. |
| 5326 | 2021-06-09 | Lab none | Installed | Bouldin Corn Gas Analyzer CO2/H2O | Installed at Bouldin Corn to replace sn 75H-2514 for calibration. |
| 5311 | 2021-06-07 | Lab | Calibration | Lab | Last calibration: 2021-03-01 AGC=99.7 SDM= DAC1= DAC2= Ambient P=100.1kPa, Tair=21.9C, Tdew=8.3C Zero Air at 250psi, AMP CA04119 524.77 at 1750 Tdewspan=16.00 CO2 zero 0.9019 -> .9024 Offset: 2.08ppm CO2 span 0.9975 -> 1.0107 Offset: 9.22ppm H2O zero 0.8675 -> .8687 Offset: 8.2ppm H2O span 1.004 -> 1.0111 Offset: -.15ppm Notes: Large offset for CO2 span. I checked it after the H2O span and I think the CO2 span is real |
| 5297 | 2021-06-02 | Tonzi-Tower Gas Analyzer CO2/H2O | Removed | Lab none | Removed from Tonzi-Tower for calibration. Replaced by sn 0035. |
| 5146 | 2021-03-02 | Lab none | Installed | Tonzi-Tower Gas Analyzer CO2/H2O | Installed at Tonzi-Tower to replace sn 75H-2180 for calibration. |
| 5140 | 2021-03-01 | Lab | 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. |
| 5022 | 2020-12-03 | West Pond Gas Analyzer CO2/H2O | Removed | Lab none | Removed from West Pond for calibration. Replaced by sn 0042. |
| 4677 | 2020-08-21 | Lab none | Installed | West Pond Gas Analyzer CH4 | Installed at West Pond to replace sn 0041 for calibration. |
| 4671 | 2020-08-20 | Lab | Calibration | Lab | Last calibration: 2020-02-11 AGC=99.8 SDM= DAC1= DAC2= Ambient P=100.1kPa, Tair=27.3C, Tdew=14.5C Zero Air at 725psi, AMP CA4396 408.97 at 500 Tdewspan=20.00 CO2 zero 0.903 -> .9019 Offset: -4.84ppm CO2 span 1.0154 -> 1.0014 Offset: 7.21ppm H2O zero 0.8674 -> .8665 Offset: -5.7ppm H2O span 1.0224 -> 1.0110 Offset: 0.26ppm Notes: Zero offsets and CO2 span larger than I expected. I had trouble with the H2O span at first because the water concentration kept decreasing. I added DI water to the dewpoint generator reservoir, which fixed the issue. Air quality was bad inside from wildfire smoke leaking in through windows. |
| 4503 | 2020-05-23 | Tonzi-Tower Gas Analyzer CO2/H2O | Removed | Lab none | Removed from Tonzi-Tower for calibration. Replaced by sn 75H-2180. |
| 4373 | 2020-02-12 | Lab | Installed | Tonzi-Tower Gas Analyzer CO2/H2O | Installed at Tonzi Tower to replace sn 75H-2182 for calibration. |
| 4370 | 2020-02-11 | Lab | 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. |
| 4361 | 2020-02-05 | Lab | Tested | Lab | After running zero air through the sensor, the offsets were still similar as immediately after the chemical swap, so we should let it run for a few more days before testing and calibrating it. CO2 was 13.2 ppm (down from 23 ppm), and H2O was 40.5 mmol/m3 (up from 30 umol/m3). |
| 4360 | 2020-02-04 | Lab | Maintenance | Lab | I started to calibrate this IRGA but the zeros were way high: ~58ppm CO2 and ~60umol/m3 H2O. The span seemed okay and other IRGAs calibrated well. I think the internal chemicals are shot. I replaced the chemicals - they were hard and I had to scrape them out with a screw driver. After putting in fresh chemicals I flushed the body with zero air before sealing it up. The zeros immediately fell by about halt to ~23ppm CO2 and ~30umol/m3. I left the IRGA running and will try to calibrate late tomorrow for field installation the next day. |
| 4165 | 2019-11-14 | Bouldin Alfalfa Gas Analyzer CO2/H2O | Removed | Lab none | Removed from BA and brought back to the lab for calibration. It was replaced by 75H-2176. |
| 4040 | 2019-08-07 | Lab none | Installed | Bouldin Alfalfa Gas Analyzer CO2/H2O | Installed at BA to replace sn 75H-2180, which was brought back to the lab for calibration. |
| 4034 | 2019-08-01 | Lab none | Calibration | Lab none | Last calibration: 2019-04-15
AGC=97.7 SDM= DAC1= DAC2= Ambient P=100.7kPa, Tair=23.4C, Tdew=13.3C Zero Air at 975psi, AMP CA4396 408.97 at 800 Tdewspan=20.00 CO2 zero 0.9014 -> .9022 Offset: 3.41ppm CO2 span 1.003 -> 1.0086 Offset: -2.05ppm H2O zero 0.8671 -> .8673 Offset: 1.2ppm H2O span 1.0077 -> 10.114 Offset: -.08ppm Notes: When SS was 97.7, I reset it to 100. I uploaded the the calibration file from 2018-10-24 and copied in the manual coefficients for CO2 span, CO2 zero, H2O span, and H2O zero from the database's record of the most recent calibration on 2019-04-15. |
| 4030 | 2019-07-25 | Sherman Wetland Gas Analyzer CO2/H2O | Removed | Lab none | Removed from SW and brought back to the lab for calibration. It was replaced by sn 0041. |
| 3922 | 2019-04-18 | Lab none | Installed | Sherman Wetland Gas Analyzer CO2/H2O | Installed at SW to replace sn 0418, which was brought back to the lab for calibration. |
| 3912 | 2019-04-15 | Lab none | Calibration | Lab none | Last calibration: 2018-10-24 AGC=97.2 SDM=0 DAC1=- DAC2=- Ambient P=100.19kPa, Tair=26.84C, Tdew=7.32C Zero Air 369068 at 1100psi, AMP CA04396 408.97 at 750 Tdewspan=15.99 CO2 zero 0.9021 -> 0.9014 Offset: -3.16ppm CO2 span 1.005 -> 1.0030 Offset: 0.86ppm H2O zero 0.866 -> 0.8671 Offset: 8.0ppm H2O span 1.0069 -> 1.0077 Offset: -0.02ppm Notes: By Joe |
| 3881 | 2019-02-12 | East End Gas Analyzer CO2/H2O | Removed | Lab none | Removed from EE and brought back to the lab for calibration. It was replaced by sn 75H-2667. |
| 3778 | 2018-10-28 | Lab none | Installed | East End Gas Analyzer CO2/H2O | Installed at EE to replace sn 75H-2176, which was brought back to the lab for calibration. |
| 3757 | 2018-10-24 | Lab none | Calibration | Lab none | 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. |
| 3746 | 2018-10-18 | Bouldin Alfalfa Gas Analyzer CO2/H2O | Removed | Lab none | Removed from Bouldin Alfalfa for calibration. Replaced by sn 75H-2667. |
| 3590 | 2018-07-12 | Lab none | Installed | Bouldin Alfalfa Gas Analyzer CO2/H2O | Installed at BA to replace sn 0065, which was brought back to the lab for calibration. |
| 3565 | 2018-07-10 | Lab none | Calibration | Lab none | Last calibration: 2018-03-05 AGC=97 SDM= DAC1= DAC2= Ambient P=100.5kPa, Tair=27.2C, Tdew=12.7C Zero Air at 150psi, LBL Air 408.97 at 1300 Tdewspan=16.00 CO2 zero 0.9023 -> .9017 Offset: -2.64ppm CO2 span 1.0093 -> 1.002 Offset: 3.79ppm H2O zero 0.9655 -> .8662 Offset: 5.1ppm H2O span 1.0096 -> 1.0069 Offset: .06ppm Notes: |
| 3553 | 2018-06-28 | Mayberry Gas Analyzer CO2/H2O | Removed | Lab none | Removed from MB and brought back to the lab for calibration. It was replaced by 75H-2669. |
| 3364 | 2018-03-19 | Lab none | Installed | Mayberry Gas Analyzer CO2/H2O | Installed at MB replacing SN 0418 for calibration. |
| 3351 | 2018-03-05 | Lab none | Calibration | Lab none | Last calibration: 2018-02-20 AGC=97 SDM=0 DAC1=0 DAC2=0 Ambient P=101.2kPa, Tair=25.7C, Tdew=1.7C Zero Air at 100psi, LBL Air 408.97 at 1700 Tdewspan=16.00 CO2 zero 0.902 -> .9023 Offset: 1.32ppm CO2 span 1.007 -> 1.0093 Offset: -1.21ppm H2O zero 0.866 -> .9655 Offset: -3.3ppm H2O span 1.009 -> 1.0096 Offset: -.01ppm Notes: |
| 3333 | 2018-02-20 | Lab none | Calibration | Lab none | 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. |
| 3304 | 2018-01-16 | West Pond Gas Analyzer CO2/H2O | Removed | Lab none | Removed from WP and brought back to the lab for calibration. it was replaced by sn 75H-2180. |
| 3148 | 2017-10-13 | Lab none | Installed | West Pond Gas Analyzer CO2/H2O | Installed on West Pond to replace sn 0418 for calibration |
| 3140 | 2017-10-11 | Lab none | Calibration | Lab none | Last calibration: 2017-05-30 AGC=96.8 SDM=0 DAC1=- DAC2=- Ambient P=100.4kPa, Tair=23.9C, Tdew=5.5C Zero Air at 500psi, AMP CO2 408.97 at 2000 Tdewspan=16.0 CO2 zero 0.9024 -> 0.9018 Offset: -2.42ppm CO2 span 1.0194 -> 1.0070 Offset: 6.38ppm H2O zero 0.8664 -> 0.8649 Offset: -10.1ppm H2O span 0.9975 -> 1.0090 Offset: 0.24ppm Notes: |
| 3074 | 2017-09-13 | East End Gas Analyzer CO2/H2O | Removed | Lab none | Removed from East End for calibration. It was replaced by sn 0041. |
| 2835 | 2017-06-14 | Lab none | Installed | East End Gas Analyzer CO2/H2O | Installed at East End after calibration in the lab to replace LI7500 sn 75H-2514. |
| 2796 | 2017-05-30 | Lab none | Calibration | Lab none | Last calibration: 2017-03-14 AGC=97.2 SDM= DAC1= DAC2= Ambient P=100.6kPa, Tair=19.9C, Tdew=12.2C Zero Air at 1050psi, NOAA Air 402.69 at 1600 Tdewspan=16.00 CO2 zero 0.9014 -> .9024 Offset: 4.23ppm CO2 span 1 -> 1.0194 Offset: -9.8ppm H2O zero 0.8651 -> .8664 Offset: 9.3ppm H2O span 1.0094 -> .9975 Offset: .26ppm Notes: |
| 2755 | 2017-05-11 | Vaira | Removed | Lab none | Removed from Vaira because the Ameriflux intercomparison finished and because we received new 7500A and sonics from Ameriflux. This head was replaced with sn 0035 that has been freshly upgraded from 7500 to 7500A. |
| 2701 | 2017-04-10 | Twitchell Rice Gas Analyzer CO2/H2O | Installed | Vaira Gas Analyzer CO2/H2O | Added to the Vaira eddy tower for the Ameriflux inter-comparison and the transition to newer LI-7500A eddy systems. |
| 2657 | 2017-03-15 | Lab none | Installed | Twitchell Rice Gas Analyzer CO2/H2O | Installed at Twitchell Rice to replace sn 75H-2182. |
| 2651 | 2017-03-14 | Lab none | Calibration | Lab none | 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: |
| 2553 | 2016-12-21 | West Pond Gas Analyzer CO2/H2O | Removed | Lab none | Removed from West Pond for calibration in the lab. Replaced by 75H-2267 |
| 2458 | 2016-09-13 | Lab none | Installed | West Pond Gas Analyzer CO2/H2O | Installed at West Pond after calibration. Replacing 75H-2176. |
| 2488 | 2016-09-12 | Lab none | Calibration | Lab none | Last calibration: 2016-05-13 AGC=99.0 SDM=6 DAC1=- DAC2=- Ambient P=99.83kPa, Tair=19.51C, Tdew=10.68C Zero Air at 400psi, God CO2 421.22 at 400 Tdewspan=10.6 CO2 zero 0.902 -> 0.9019 Offset: -0.58ppm CO2 span 1.008 -> 1.0084 Offset: -0.29ppm H2O zero 0.8668 -> 0.8662 Offset: -4.1ppm H2O span 1.0109 -> 1.0155 Offset: -0.1ppm Notes: |
| 2441 | 2016-08-31 | East End Gas Analyzer CO2/H2O | Removed | Lab none | Removed from the East End tower for calibration. Replaced by sn 1594. |
| 2279 | 2016-05-24 | Lab none | Installed | East End Gas Analyzer CO2/H2O | Installed LI7500 at East End tower, replaced sn 75H-2514 which was taken down for calibration. |
| 2261 | 2016-05-13 | Lab none | Calibration | Lab none | Last calibration: 2015-12-07 AGC=97.6 SDM=- DAC1=- DAC2=- Ambient P=100.15kPa, Tair=20.52C, Tdew=8.5C Zero Air at 600psi, God CO2 421.22 at 500 Tdewspan=15.09 CO2 zero 0.9019 -> 0.9020 Offset: 0.40ppm CO2 span 1.0114 -> 1.0080 Offset: 1.84ppm H2O zero 0.8671 -> 0.8668 Offset: -2.4ppm H2O span 1.0258 -> 1.0109 Offset: 0.31ppm 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. |
| 2230 | 2016-04-13 | Mayberry Gas Analyzer CO2/H2O | Removed | Lab none | Taken down from Mayberry system for calibration and replaced with sn 75H-2182 |
| 2144 | 2015-12-28 | Lab none | Installed | Mayberry Gas Analyzer CO2/H2O | Installed on the Mayberry Tower to replace sn 75H-2514 for calibration. |
| 2126 | 2015-12-07 | Lab none | Calibration | Lab none | 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: |
| 2106 | 2015-11-25 | Twitchell Alfalfa Gas Analyzer CO2/H2O | Removed | Lab none | Removed from the Alfalfa Tower for calibration. Replaced by sn 1594 |
| 1919 | 2015-07-22 | Lab none | Installed | Twitchell Alfalfa Gas Analyzer CO2/H2O | Installed on the Alfalfa Tower to replace sn 0065 for calibration. |
| 1907 | 2015-07-15 | Lab none | Calibration | Lab none | Last calibration: 2014-12-22 AGC=94.1 SDM=1 DAC1=- DAC2=- Ambient P=100.19kPa, Tair=21.07C, Tdew=16.66C Zero Air at 800psi, God CO2 421.22 at 850 Tdewspan=11.08 CO2 zero 0.9018 -> 0.9021 Offset: 1.73ppm CO2 span 1.0079 -> 1.0000 Offset: 4.17ppm H2O zero 0.865 -> 0.8671 Offset: 15.4ppm H2O span 1.0679 -> 0.9986 Offset: 1.34ppm Notes: |
| 1809 | 2015-05-07 | Twitchell Rice Gas Analyzer CO2/H2O | Removed | Lab none | Removed from the Twitchell Rice tower for calibration. Replaced by sn 75H-2514 |
| 1677 | 2015-01-20 | Lab none | Installed | Twitchell Rice Gas Analyzer CO2/H2O | Installed on the Rice tower to replace sn 0065 and matches the coefficients loaded on the 7550 box. |
| 1639 | 2014-12-23 | Lab none | Installed | Twitchell Rice Gas Analyzer CO2/H2O | Installed on the Twitchell Rice Tower to replace sn 75H-2176 for calibration. |
| 1649 | 2014-12-22 | Lab none | Calibration | Lab none | Last calibration: 2014-06-24 AGC=97.24 SDM=6 DAC1=- DAC2=- Ambient P=101.50kPa, Tair=21.51C, Tdew=12.88C Zero Air at 1000psi, God CO2 421.22 at 1300 Tdewspan=15.95 CO2 zero 0.9012 -> 0.9018 Offset: 2.37ppm CO2 span 1.0011 -> 1.0079 Offset: -3.74ppm H2O zero 0.8652 -> 0.8650 Offset: -1.2ppm H2O span 1.0087 -> 1.0679 Offset: -1.22ppm Notes: |
| 1575 | 2014-09-25 | Twitchell Rice Gas Analyzer CO2/H2O | Removed | Lab none | Removed from the Twitchell tower for calibration. Replaced by sn 75H-2176. |
| 1498 | 2014-06-26 | Lab none | Installed | Twitchell Rice Gas Analyzer CO2/H2O | Installed on the Twitchell tower to replace sn 75H-2182 for calibration. |
| 1464 | 2014-06-24 | Lab none | Calibration | Lab none | 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: |
| 1314 | 2014-04-03 | West Pond Gas Analyzer CO2/H2O | Removed | Lab none | Removed from West Pond for calibration. Replaced by sn 0065. |
| 1209 | 2013-12-19 | Lab none | Installed | West Pond Gas Analyzer CO2/H2O | Installed on the West Pond Tower to replace sn 75H-2182 for calibration. |
| 1208 | 2013-12-18 | Lab none | Calibration | Lab none | Last calibration: 2013-07-09 AGC=95.3 SDM=1 DAC1=- DAC2=- Ambient P=99.78kPa, Tair=22.32C, Tdew=7.8C Zero Air at 1500psi, God CO2 421.22 at 1500 Tdewspan=15.16 CO2 zero 0.9009 -> 0.9012 Offset: 1.12ppm CO2 span 1.0016 -> 1.0016 Offset: -0.05ppm H2O zero 0.8636 -> 0.8643 Offset: 5.3ppm H2O span 1.0091 -> 0.9987 Offset: 0.25ppm Notes: |
| 1207 | 2013-12-06 | Mayberry Gas Analyzer CO2/H2O | Removed | Lab none | Removed from the Mayberry Tower for calibration. Replaced by sn 75H-2180 |
| 1037 | 2013-07-10 | Lab none | Installed | Mayberry Gas Analyzer CO2/H2O | Installed on the Mayberry tower to replace sn2182 for calibration |
| 1034 | 2013-07-09 | Lab none | Calibration | Lab none | Last calibration: 2012-10-29 AGC=94.6 SDM=2 DAC1=na DAC2=na Ambient P=100.33kPa, Tair=23.79C, Tdew=12.73C Zero Air at 1700psi, God co2 421.22 at 1600 Tdewspan=15.19 CO2 zero 0.9024 -> 0.9009 Offset: -6.67ppm CO2 span 1.0155 -> 1.0016 Offset: 7.58ppm H2O zero 0.8639 -> 0.8636 Offset: 0.5ppm H2O span 1.0153 -> 1.0091 Offset: 0.13ppm Notes: Error message said - could not save calibration - on all zero and spans, but all seemed well. |
| 950 | 2013-02-14 | Mayberry Gas Analyzer CO2/H2O | Removed | Lab none | Removed from the Mayberry tower with AIU-0614 for upgrade at Licor |
| 831 | 2012-10-30 | Lab none | Installed | Mayberry Gas Analyzer CO2/H2O | Installed on the Mayberry Tower to replace sn 2180 for repair. |
| 842 | 2012-10-29 | Lab none | Calibration | Lab none | Last calibration: 2012-01-27 AGC=43.8 SDM=6 DAC1=none DAC2=none Ambient P=100.7kPa, Tair=21.24C, Tdew=14.48C Zero Air at 1800psi, CO2 in air 421.22 at 1700 Tdewspan=15.05 CO2 zero 0.9022 -> 0.9024 Offset: 1.0ppm CO2 span 1.0056 -> 1.0155 Offset: -4.91ppm H2O zero 0.8635 -> 0.8639 Offset: 5.6ppm H2O span 1.0054 -> 1.0153 Offset: -0.15ppm Notes: Last calibration was original done by Licor. |
| 773 | 2012-09-06 | Twitchell Rice Gas Analyzer CO2/H2O | Removed | Lab none | Removed from the Twitchell tower for calibration. Replaced by 2176. |
| 663 | 2012-05-07 | Lab none | Installed | Twitchell Rice Gas Analyzer CO2/H2O | Installed with AIU-0614 swapping out old LI7500 system. |
| 482 | 2011-11-18 | Factory | Calibration | Lab none | Initial Factory Calibration: CO2 zero = 0.9022, CO2 span = 1.0056 (at 622ppm), CO2 span2 = 0, H2O zero = 0.8631, H2O span = 1.0054 (at 12 C), H2O span2 = 0. |