Equipment and Calibration

Equipment history at Twitchell Rice

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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
2010-08-17 0035 LI-7500A Installed Gas Analyzer CO2/H2O Installed on the Twitchell tower to swap out sn 1594 for calibration.
2011-05-24 0035 LI-7500A Calibration Lab Last calibration: 2011-01-04 AGC=58 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.77kPa Tair=23.5C, Tdew=9.06C zero air at 1450psi, CO2 in air 597.4ppm 0psi Tdewspan=14.1 CO2 zero 0.9376 -> 0.9334 Offset: -29.4ppm CO2 span 1.038 -> 1.0093 Offset: 24.2ppm H2O zero 0.725 -> 0.7366 Offset: 77.1mmol/m3 H2O span 0 -> 0.9749 Offset: -3.32C Notes:
2010-11-18 0035 LI-7500A Removed Gas Analyzer CO2/H2O This IRGA was removed from the Twitchell Tower for calibration.
2011-05-24 0035 LI-7500A Calibration Lab Last calibration: 2011-01-04 AGC=58 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.77kPa Tair=23.5C, Tdew=9.06C zero air at 1450psi, CO2 in air 597.4ppm 0psi Tdewspan=14.1 CO2 zero 0.9376 -> 0.9334 Offset: -29.4ppm CO2 span 1.038 -> 1.0093 Offset: 24.2ppm H2O zero 0.725 -> 0.7366 Offset: 77.1mmol/m3 H2O span 0 -> 0.9749 Offset: -3.32C Notes:
2011-05-25 0035 LI-7500A Installed Gas Analyzer CO2/H2O Installed on the Twitchell tower to swap out sn 1594 for calibration
2011-09-14 0035 LI-7500A Calibration Lab Last calibration: 2011-01-04 AGC=58 SDM=7 DAC1=1-1000 DAC2=10-25 Ambient P=100.31kPa Tair=19.4C, Tdew=14.2C CO2 free air at 60psi, CO2 in air 405.85ppm 1700psi Tdewspan=14 CO2 zero 0.9334 -> 0.9338 Offset: 0.06ppm CO2 span 1.0093 -> 1.0108 Offset: 0.9ppm H2O zero 0.7366 -> 0.7353 Offset: -9.2mmol/m3 H2O span 0.9749 -> 0.9843 Offset: 0.14C Notes:
2011-08-25 0035 LI-7500A Removed Gas Analyzer CO2/H2O Removed from the Twitchell tower for calibration, replaced by sn 0041.
2011-09-14 0035 LI-7500A Calibration Lab Last calibration: 2011-01-04 AGC=58 SDM=7 DAC1=1-1000 DAC2=10-25 Ambient P=100.31kPa Tair=19.4C, Tdew=14.2C CO2 free air at 60psi, CO2 in air 405.85ppm 1700psi Tdewspan=14 CO2 zero 0.9334 -> 0.9338 Offset: 0.06ppm CO2 span 1.0093 -> 1.0108 Offset: 0.9ppm H2O zero 0.7366 -> 0.7353 Offset: -9.2mmol/m3 H2O span 0.9749 -> 0.9843 Offset: 0.14C Notes:
2009-07-31 0041 LI-7500A Installed Gas Analyzer CO2/H2O Installed at Rice. Can't figure out which sn it replaced though....
2009-12-14 0041 LI-7500A Calibration Lab Last calibration: 2009-09-15 AGC=55 SDM= DAC1= DAC2= Ambient P=kPa, Tair=C, Tdew=C at psi, at Tdewspan= CO2 zero 0.9882 -> 0.8450 Offset: ppm CO2 span 0.9972 -> 1.0000 Offset: ppm H2O zero 0.7360 -> 1.107 Offset: ppm H2O span 1.0197 -> 0.9920 Offset: ppm Notes: Embedded software v3.0.0. Not a good report - take with a grain of salt.
2009-12-09 0041 LI-7500A Removed Gas Analyzer CO2/H2O Removed for the Twitchell tower and returned to the lab.
2009-12-14 0041 LI-7500A Calibration Lab Last calibration: 2009-09-15 AGC=55 SDM= DAC1= DAC2= Ambient P=kPa, Tair=C, Tdew=C at psi, at Tdewspan= CO2 zero 0.9882 -> 0.8450 Offset: ppm CO2 span 0.9972 -> 1.0000 Offset: ppm H2O zero 0.7360 -> 1.107 Offset: ppm H2O span 1.0197 -> 0.9920 Offset: ppm Notes: Embedded software v3.0.0. Not a good report - take with a grain of salt.
2011-08-25 0041 LI-7500A Installed Gas Analyzer CO2/H2O Installed on the Twitchell tower to replace sn 0035 for calibration.
2012-07-24 0041 LI-7500A Calibration Lab Last calibration: 2011-08-24 AGC=52 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.3kPa, Tair=25.6C, Tdew=11.5C dry air at 1900psi, CO2 436.53 at 1500 Tdewspan=15.0 CO2 zero 1.0011 -> 1.0008 Offset: 0.51ppm CO2 span 1.006 -> 1.0084 Offset: 0.3ppm H2O zero 0.8201 -> 0.8201 Offset: -0.33ppm H2O span 0.9714 -> 0.9947 Offset: 3.35ppm Notes: calibrated by Siyan
2012-01-25 0041 LI-7500A Removed Gas Analyzer CO2/H2O Swapped off of the Twitchell Tower for calibration. Replaced by cn 0065.
2012-07-24 0041 LI-7500A Calibration Lab Last calibration: 2011-08-24 AGC=52 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=100.3kPa, Tair=25.6C, Tdew=11.5C dry air at 1900psi, CO2 436.53 at 1500 Tdewspan=15.0 CO2 zero 1.0011 -> 1.0008 Offset: 0.51ppm CO2 span 1.006 -> 1.0084 Offset: 0.3ppm H2O zero 0.8201 -> 0.8201 Offset: -0.33ppm H2O span 0.9714 -> 0.9947 Offset: 3.35ppm Notes: calibrated by Siyan
2009-09-09 0042 LI-7500A Installed Gas Analyzer CO2/H2O Freshly calibrated, installed.
2009-12-08 0042 LI-7500A Calibration Lab Embedded software updated to v3.0.1 Last calibration Sept 15 2009 AGC=67, Pressure=101.01kPa Temperature=17.3C CO2 span=597.4ppm, H2O span=14.5C Precal CO2 zero=0.9609, span=0.9818 Postcal CO2 zero=0.9615, span=0.9897 Precal H2O zero=0.7855, span=1.0086 Postcal H2O zero=0.7844, span=0.9773 CO2 zero off by 2.2ppm, span off by ~7ppm H2O span off by ~0.7C
2009-12-09 0042 LI-7500A Installed Gas Analyzer CO2/H2O Installed on the Twitchell Rice tower to replace 0041 for calibration. Not sure what the note on 2009-09-09 indicates since this sensor was only installed at the rice on 20091209 and prior to that sn 0041 was installed at the rice on 20090731 (there are no indications in the field notes that would suggest this sensor was installed at the rice on 2009-09-09).
2010-04-05 0042 LI-7500A Calibration Lab Last calibration Dec 8, 2009 AGC=68, Pressure=100.491kPa Temperature=20.42C CO2 span=597.4ppm, H2O span=17.6C, N2 650psi, CO2 300psi Precal CO2 zero=0.9615, span=0.9897 Postcal CO2 zero=0.9620, span=0.9862 Precal H2O zero=0.7844, span=0.9773 Postcal H2O zero=0.7840, span=1.0151 CO2 zero off by +1.81ppm, span off by +2.6+-0.2ppm H2O zero off by -0.05g/m3, span off by -0.77C
2010-03-18 0042 LI-7500A Removed Gas Analyzer CO2/H2O This LI7500 was removed from Twitchell tower for calibration.
2010-04-05 0042 LI-7500A Calibration Lab Last calibration Dec 8, 2009 AGC=68, Pressure=100.491kPa Temperature=20.42C CO2 span=597.4ppm, H2O span=17.6C, N2 650psi, CO2 300psi Precal CO2 zero=0.9615, span=0.9897 Postcal CO2 zero=0.9620, span=0.9862 Precal H2O zero=0.7844, span=0.9773 Postcal H2O zero=0.7840, span=1.0151 CO2 zero off by +1.81ppm, span off by +2.6+-0.2ppm H2O zero off by -0.05g/m3, span off by -0.77C
2010-11-18 0042 LI-7500A Installed Gas Analyzer CO2/H2O This IRGA was installed on the Twitchell tower after the move to replace sn 0035 for calibration.
2011-02-02 0042 LI-7500A Calibration Lab Last calibration Nov 16, 2010 AGC=67, SDM=7, DAC1 0-1000 H2O, DAC2 10-25 CO2 P=101.84 kPa Tair=21.06C, Tdew=~-1C Zero air no scrub 1600psi, CO2 597.4ppm 150psi, Tdew=-7.1C Precal CO2 zero=0.9622, span=0.9827 Postcal CO2 zero=0.9605, span=0.9855 Precal H2O zero=0.7829, span=0.9693 Postcal H2O zero=0.7877, span=1.1467 CO2 zero off by -6.13ppm, span off by -2.3ppm H2O zero off by +30.7mmol/m3, span off by -2.4C The weather is warm and dry making the dew point very low and difficult to calibrate.
2011-01-28 0042 LI-7500A Removed Gas Analyzer CO2/H2O This sensor was removed from the Twitchell tower for calibration in the lab. sn 1594 was swapped in.
2011-02-02 0042 LI-7500A Calibration Lab Last calibration Nov 16, 2010 AGC=67, SDM=7, DAC1 0-1000 H2O, DAC2 10-25 CO2 P=101.84 kPa Tair=21.06C, Tdew=~-1C Zero air no scrub 1600psi, CO2 597.4ppm 150psi, Tdew=-7.1C Precal CO2 zero=0.9622, span=0.9827 Postcal CO2 zero=0.9605, span=0.9855 Precal H2O zero=0.7829, span=0.9693 Postcal H2O zero=0.7877, span=1.1467 CO2 zero off by -6.13ppm, span off by -2.3ppm H2O zero off by +30.7mmol/m3, span off by -2.4C The weather is warm and dry making the dew point very low and difficult to calibrate.
2012-01-25 0065 LI-7500A Installed Gas Analyzer CO2/H2O Installed on the Twitchell tower to replace sn 0041 for calibration.
2012-08-06 0065 LI-7500A Calibration Lab Last calibration: 2012-05-18 AGC=65 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=99.63kPa, Tair=22.07C, Tdew=8.90C Zero air at 1700psi, CO2 in air 436.53 at 1450 Tdewspan=15.08 CO2 zero 0.8741 -> 0.8740 Offset: -0.36ppm CO2 span 0.9958 -> 0.9973 Offset: -0.93ppm H2O zero 0.6415 -> 0.6387 Offset: -19.3ppm H2O span 1.0009 -> 1.0898 Offset: -1.76ppm Notes: Calibration in preparation to be upgraded to a LI-7500A head.
2012-05-07 0065 LI-7500A Removed Gas Analyzer CO2/H2O Removed from the tower.  Replaced by the new DWR Li7500A (sn 2150).
2012-08-06 0065 LI-7500A Calibration Lab Last calibration: 2012-05-18 AGC=65 SDM=7 DAC1=0-1000 DAC2=10-25 Ambient P=99.63kPa, Tair=22.07C, Tdew=8.90C Zero air at 1700psi, CO2 in air 436.53 at 1450 Tdewspan=15.08 CO2 zero 0.8741 -> 0.8740 Offset: -0.36ppm CO2 span 0.9958 -> 0.9973 Offset: -0.93ppm H2O zero 0.6415 -> 0.6387 Offset: -19.3ppm H2O span 1.0009 -> 1.0898 Offset: -1.76ppm Notes: Calibration in preparation to be upgraded to a LI-7500A head.
2013-05-09 0065 LI-7500A Installed Gas Analyzer CO2/H2O Installed on the Twitchell Rice tower to replace sn2180 for calibration.
2013-09-11 0065 LI-7500A Calibration Lab Last calibration: 2013-05-08 AGC=71.77 SDM=1 DAC1=- DAC2=- Ambient P=100.08kPa, Tair=23.13C, Tdew=14.04C Zero air at 1650psi, God CO2 421.22 at 1600 Tdewspan=15.8 CO2 zero 0.8904 -> 0.8897 Offset: -2.78ppm CO2 span 1.0198 -> 1.0041 Offset: 8.53ppm H2O zero 0.7022 -> 0.7040 Offset: 12.5ppm H2O span 0.9726 -> 0.9959 Offset: -1.1ppm Notes:
2013-08-28 0065 LI-7500A Removed Gas Analyzer CO2/H2O Removed from the Twitchell Rice tower for calibration. Replaced by sn 2176
2013-09-11 0065 LI-7500A Calibration Lab Last calibration: 2013-05-08 AGC=71.77 SDM=1 DAC1=- DAC2=- Ambient P=100.08kPa, Tair=23.13C, Tdew=14.04C Zero air at 1650psi, God CO2 421.22 at 1600 Tdewspan=15.8 CO2 zero 0.8904 -> 0.8897 Offset: -2.78ppm CO2 span 1.0198 -> 1.0041 Offset: 8.53ppm H2O zero 0.7022 -> 0.7040 Offset: 12.5ppm H2O span 0.9726 -> 0.9959 Offset: -1.1ppm Notes:
2015-01-20 0065 LI-7500A Removed Gas Analyzer CO2/H2O Removed from the Rice tower because it was the wrong head from the coefficients loaded to the 7550 box. Replaced by sn 75H-2150
2015-04-20 0065 LI-7500A Calibration Lab Last calibration: 2014-12-22 AGC=72.8 SDM=1 DAC1=- DAC2=- Ambient P=100.0kPa, Tair=20.13C, Tdew=12.49C Zero Air at 850psi, God CO2 421.22 at 1100 Tdewspan=15.96 CO2 zero 0.8909 -> 0.8897 Offset: -5.4ppm CO2 span 0.9835 -> 1.0074 Offset: -13.02ppm H2O zero 0.705 -> 0.7055 Offset: 4.0ppm H2O span 1.1245 -> 1.0071 Offset: 2.34ppm Notes: The internal chemicals were changes a few weeks ago - the old ones still looked good though. Relatively large offsets in span, H2O span offset similar to other 7500s calibrated at this time - dew point generator and Vaisala probe agreed with in 0.5C
2015-08-06 0065 LI-7500A Installed Gas Analyzer CO2/H2O Installed on the Twitchell Rice tower to replace sn 75H-2514 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:
2015-11-25 0065 LI-7500A Removed Gas Analyzer CO2/H2O Removed from the Twitchell Rice tower for calibration. REplaced by sn 75H-2182
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:
2016-05-24 0065 LI-7500A Installed Gas Analyzer CO2/H2O Installed at Twitchell Rice tower to replace sn 75H-2176 for calibration
2016-12-06 0065 LI-7500A Calibration Lab Last calibration: 2016-05-13 AGC=74.7 SDM=6 DAC1= DAC2= Ambient P=100.29kPa, Tair=16.04C, Tdew=0.60C Zero Air at 350psi, God CO2 421.22 at 400 Tdewspan=16.02 CO2 zero 0.8898 -> 0.8899 Offset: 0.36ppm CO2 span 1.0149 -> 1.0142 Offset: 0.43ppm H2O zero 0.7086 -> 0.7086 Offset: 0.2ppm H2O span 1.0139 -> 1.0127 Offset: 0.01ppm Notes: H2O span done later in the day.
2016-08-31 0065 LI-7500A Removed Gas Analyzer CO2/H2O Removed from the Twitchell Rice tower for calibration. Replaced by sn 75H-2180.
2016-12-06 0065 LI-7500A Calibration Lab Last calibration: 2016-05-13 AGC=74.7 SDM=6 DAC1= DAC2= Ambient P=100.29kPa, Tair=16.04C, Tdew=0.60C Zero Air at 350psi, God CO2 421.22 at 400 Tdewspan=16.02 CO2 zero 0.8898 -> 0.8899 Offset: 0.36ppm CO2 span 1.0149 -> 1.0142 Offset: 0.43ppm H2O zero 0.7086 -> 0.7086 Offset: 0.2ppm H2O span 1.0139 -> 1.0127 Offset: 0.01ppm Notes: H2O span done later in the day.
2010-03-18 0418 LI-7500A Installed Gas Analyzer CO2/H2O This LI7500 was installed at Twitchell Island. Its SDM address was changed to 7 to match CR1000 programs.
2010-06-02 0418 LI-7500A Calibration Lab Last cal 2010-05-18, SMD 7 DAC1 H2O 0-1000 DAC2 CO2 10-25 AGC = 49%, T = 23.11C, P = 100.88kPa, Td = 12.44C N2 = 0.0 400psi CO2 = 597.4ppm <300psi, Td = 9.7C CO2 zero = 0.9011-> 0.9015, offset +1.44ppm CO2 span = 1.0045-> 1.0022, offset +1.5ppm H2O zero = 0.8524-> 0.8499, offset -0.262mmol/m3 H2O span = 1.0097-> 0.9921, offset +0.31C
2010-05-28 0418 LI-7500A Removed Gas Analyzer CO2/H2O This analyzer was removed from the Twitchell tower for calibration.
2010-06-02 0418 LI-7500A Calibration Lab Last cal 2010-05-18, SMD 7 DAC1 H2O 0-1000 DAC2 CO2 10-25 AGC = 49%, T = 23.11C, P = 100.88kPa, Td = 12.44C N2 = 0.0 400psi CO2 = 597.4ppm <300psi, Td = 9.7C CO2 zero = 0.9011-> 0.9015, offset +1.44ppm CO2 span = 1.0045-> 1.0022, offset +1.5ppm H2O zero = 0.8524-> 0.8499, offset -0.262mmol/m3 H2O span = 1.0097-> 0.9921, offset +0.31C
2010-05-13 05-0010 FMA RMT-200 Calibration The LGR was reporting: 8:27PDT, 22.89C, 120.58Torr, 16.781usec, 10Hz, 1.858ppm I adjusted the bypass valve to correct the pressure. I calibrated the LGR with 3.276ppm tank with 700psi. Last cal was March 22, 2011 Precal: 8:47PDT. 24.11C, 156.50Torr, 16.776usec, 1Hz, 3.290ppm After cal 3.276ppm Before I left the LGR read: 8:52PDT, 24.49C, 150.77Torr, 16.774usec, 10Hz, 1.883ppm
2010-10-01 05-0010 FMA RMT-200 Removed The air conditioning had failed or been over come by unusually hot weather and the box got really hot (~60C). The LGR had crashed but the pump was running. Starting at stopping the pump and LGR might have back flushed fine particals into the cell. The ring time was down to 4usec. I removed the LGR for mirror cleaning.
2011-01-18 05-0010 FMA RMT-200 Installed Installed to replace our other LGR FMA that suffered a power problem.
2011-03-22 05-0010 FMA RMT-200 Calibration Pre cal: 8:42PST, 17.16C, 156.57Torr, 17.042usec, 1Hz, 3.347ppm � about 70ppb off. Post cal: 3.277ppm Before we left the LGR read: 8:55PST, 17.42C, 149.22Torr, 17.068usec, 10Hz, 2.176ppm
2011-06-10 05-0010 FMA RMT-200 Removed Removed from Twitchell island because it was hanging up during boot. Frank discovered it on June 6th.
2011-10-27 05-0010 FMA RMT-200 Installed Installed to replace sn 08-0114 since in slow flow mode there was zero flow.
2011-11-22 05-0010 FMA RMT-200 Calibration We calibrated the LGR with a 3.276ppm tank with 400psi. Last cal was Oct 10, 2011. 9:56PST, 9.53C, 156.07Torr, 14.341usec, 1Hz, 3.357ppm After cal it was right on. When we left it was back in high flow at 10Hz and pressure was about 141Torr, I did not adjust the bypass valve.
2011-12-18 05-0010 FMA RMT-200 Calibration All was running. The LGR read: 9:04PST, 31.36C, 97.41Torr, 13.973usec, 10Hz, 2.964ppm I calibrated the LGR with secondary tank with 3.276ppm CH4 at 250psi. Last cal was 2011-11-22 Pre cal: 9:12PST, 30.18C, 124.54Torr, 13.972usec, 1Hz, 3.200ppm Pressure was a little low but okay. After cal the LGR read 3.271ppm. I adjusted the bypass valve to bring the pressure to 146Torr in high flow mode. I returned the LGR to 10Hz before leaving.
2012-01-25 05-0010 FMA RMT-200 Calibration With the new external filter I calibrated the LGR. The cal tank has <200psi of 3.276ppm CH4. Last calibration was Dec 20, 2011. Pre Cal: 8:49PST, 29.61C, 156.07Torr, 13.871usec, 3.282ppm, 1Hz The first try at calibration failed somehow ending in a value (3.317ppm) farther from the span gas. A second calibration seemed to work fine and ended up right on. When I left the LGR read 9:56PST, 23.93C, 153.81Torr, 13.060usec, 10Hz, 2.311ppm
2012-04-24 05-0010 FMA RMT-200 Removed Removed from the box at Twitchell, replced with LI-7700
2009-06-04 08-0114 FMA RMT-200 Installed Installed at the Rice.
2009-08-06 08-0114 FMA RMT-200 Moved Removed from Rice and replaced with Frank's FGGA analyzer (sn 09-0012). Installed to replace LGR sn 05-0010 for maintenance.
2010-08-17 08-0114 FMA RMT-200 Installed Installed at Twitchell to replace Frank's FGGA that is having problems.
2010-09-08 08-0114 FMA RMT-200 Calibration I adjusted the bypass valve. When Frank arrived we did a calibration. Last cal was done on Aug 6, 2010. The field tank is 3.276ppm CH4 Precal: 9:52PST, 25.54C, 111.2Torr, 16.112usec, 1Hz, 3.377ppm Low flow pressure seems low here too but I did not check the filters. Being 100ppb off seems a lot, last cal uses a standard closer to 1.8ppm though. Post cal CH4 read 3.276ppm. When we left the LGR read: 10:02PST, 25.49C, 144.34Torr, 16.080usec, 10Hz, 1.840ppm
2010-12-02 08-0114 FMA RMT-200 Calibration Pre cal: 7:43PST, 24.90C, 142.80Torr, 16.064usec, 1Hz, 2.660ppm - off by 616ppb a lot. Post cal CH4 was 3.263ppm And back in operation after adjusting the bypass valve because pressure was too high: 7:53PST, 23.33C, 143.96Torr, 16.089usec, 10Hz, 3.266ppm
2011-01-18 08-0114 FMA RMT-200 Removed Removed from Twitchell Island after suffering a power problem before Christmas. Initial symptom was blowing 15A fuse in power connector. Internally, a big capacitor and a diode are blown on the main power board.
2011-06-10 08-0114 FMA RMT-200 Installed Installed at Twitchell to replace sn 05-0010 which was hanging up on boot. No problems during install.
2011-08-12 08-0114 FMA RMT-200 Calibration The LGR pressure was really low 89.28 and in slow flow it was even lower. I checked the external 2um filter and it seemed clean. I checked the internal 2um filter and it was completely stopped up. I replaced it with a cleaned one. I blew the replacement filter clear with the cal tank but it still brought the ring time down after I got it all back together. The pressure was better and I had to close down the bypass valve to bring it in range. 9:00PST, 24.16C, 144.56Torr, 13.300usec, 10Hz, 1.831ppm The low flow pressure was still a bit low during calibration: 9:06PST, 24.05C, 125.31Torr, 13.302usec, 1Hz, 3.270ppm The calibration was almost right on with the 3.267ppm tank at 650psi. Last cal was July 1, 2011. The pressure fell to 111.7 by the end of the calibration. I also replace the 40um filter strainer. It was very dirty and had some spider parts in it. Before leaving the LGR read: 9:34PST, 24.55C, 144.81Torr, 13.291usec, 10Hz, 1.827ppm
2011-10-27 08-0114 FMA RMT-200 Removed I removed the LGR from Twitchell due to low pressure and almost no flow in low flow mode. I swapped in LGR sn 05-0010.
2010-03-04 09-0010 FGGA Installed This analyzer was installed at twitchell so that the other one could be removed for maintenance. This anaylzer had inital line lock problems, but has running properly when I left.
2010-04-08 09-0010 FGGA Calibration Last calibration: 2010-03-11 Cell Pressure=134.99Torr, Cell Temperature=26.64C, Ring Time=14.014usec 2nd Standard at 1900psi CH4 Span=3.276ppm, CO2 Span=433.0ppm CH4 = 3.302 -> 3.305 Offset: -0.026ppm CO2 = 436 -> 439 Offset: -3ppm Notes: Seems to have made it worse?
2010-04-22 09-0010 FGGA Calibration The LGR would not line lock CH4/H2O when power was restored. Initially the cell temperature was about 10C and I let it warm up to 18C with no lock and many restarts. Finally I called LGR and got their maintenance password to change line lock settings from 0.165 to 0.185 and this did the trick. Initial readings 11:35, 18.50C, 144.60Torr, 13.940usec, 10Hz, 2.149ppm, 12039ppm, 398.07ppm Calibrated with 3.276ppm CH4, 433.0ppm CO2 tank, last cal Mar 11, 2010 Precal 11:40, 138.24Torr, 3.270+-0.002ppm CH4, 425.0+-1ppm CO2 Postcal: 11:44, 138Torr, 3.279+-0.002ppm CH4, 433.5+-1ppm CO2
2010-05-05 09-0010 FGGA Calibration Twitchell: cal gas 3.276 ppm CH4, 433ppm CO2, mirror 13.9 us, 145 Torr, 37C CH4 pre-cal: 3.342 CO2 pre-cal: 441 CH4 post-cal: 3.273 CO2 post-cal: 433
2010-05-20 09-0010 FGGA Calibration calibrated the LGR: Initial readings: 9:35, 19.99C, 138.24Torr, 14.071usec, 10Hz, 1.8530ppm, 8187ppm, 406.97ppm bypass valve adjusted to 143.55Torr. Calibrated with 3.276ppm CH4, 433.0ppm CO2 tank with 1800psi Pre cal: 9:41, 138.16Torr, 1Hz, 3.220+-0.005ppm, 444+-1ppm Post cal: 9:48, 3.278+-0.002ppm, 432+-1ppm Ambient conditions after calibration: 9:50, 20.02C, 143.90Torr, 14.069usec, 10Hz, 1.8610ppm, 8332ppm, 390.55ppm
2010-06-03 09-0010 FGGA Calibration Calibrated with 3.276ppm CH4 and 433.0ppm CO2 tank 1750psi. Last cal May 20, 2010 Precal: 10:26, 129.6Torr dropping to 119Torr, 3.30+-0.05ppm CH4, 430+-1ppm CO2 Postcal: 3.26+-0.001ppm CH4, 429+-1ppm CO2 System back at 10Hz.
2010-06-22 09-0010 FGGA Calibration Initial readings from the LGR were: 9:57, 29.18C, 129.50Torr, 13.902usec, 10Hz, 1.865ppm, 14819ppm, 385.91ppm I tried calibrating and notice very low pressure in low flow mode � 74.89Torr. I completed the calibration, but did not like it. I checked the exterior 2um filter and it seemed okay. I also checked the internal 2um filter and it seemed good as well. In checking the interior I noticed a loose connection. The connector that has to be disconnected to clean the mirror was left disconnected last time I cleaned the mirrors. I�m asking LGR what this connection does. It doesn�t look significant but after connecting it the pressure improved somewhat. And I did a second calibration. Precal: last cal June 3, 3.276ppm CH4, 433.0ppm CO2, 1800psi 10:54, 134.32Torr, 3.217+-0.003ppm CH4, 416+-2ppm CO2 Post cal: 10:57, 130.0Torr, 3.276+-0.002ppm CH4, 433+-1ppm CO2 Last readings from LGR: 11:02, 28.57C, 144.47Torr, 13.86usec, 10Hz, 1.888ppm, 15195ppm, 400.44ppm
2010-08-17 09-0010 FGGA Removed Removed from Twitchell for low to no flow in slow flow mode. Need to trouble shoot in the lab.
2009-08-06 09-0012 FGGA Installed Installed Frank's FGGA at the rice
2010-01-14 09-0012 FGGA Calibration Last calibration: 2009-03-03 00:00:00 Cell Pressure=148.63kPa, Cell Temperature=28.27C, Ring Time=17.277usec 2nd Standard at 0psi: CH4: 3.276ppm, CO2: 433ppm, H2O: 0ppm CH4 = 3.368ppm -> 3.275ppm Offset: -0.092ppb CO2 = 432.1ppm -> 433.4ppm Offset: 0.9ppm Notes: LGR pressure very low ~16Torr, but very easily adjusted using bypass valve.
2010-02-18 09-0012 FGGA Calibration Last calibration: 2010-01-14 00:00:00 Cell Pressure=39.54kPa, Cell Temperature=27.98C, Ring Time=17.17usec 2nd standard at 0psi: CH4: 3.276ppm, CO2: 433ppm, H2O: 0ppm CH4 = 3.5032ppm -> 3.316ppm Offset: -0.227ppb CO2 = 448.8ppm -> 441ppm Offset: -15.8ppm Notes: External filter seemed plugged up, swapped it with cleaned filter before calibration. Values improved, but I still don't agree with cal tank. I think the very low pressure is a problem. Maybe the internal filter is plugged up. I will do some check in the lab and then possibly swap out the LGR.
2010-03-04 09-0012 FGGA Removed This analyzer was removed from Twitchell for mainenance - low pressure on internal pump. It is now in the lab.
2010-05-28 1594 LI-7500A Installed Gas Analyzer CO2/H2O Installed on Twitchell tower after fresh lab calibration.
2010-08-17 1594 LI-7500A Removed Gas Analyzer CO2/H2O Removed from the Twitchell tower for calibration.
2011-01-28 1594 LI-7500A Installed Gas Analyzer CO2/H2O This sensor was installed on the Twitchell tower to swap out sn 0042 for calibration.
2011-05-25 1594 LI-7500A Removed Gas Analyzer CO2/H2O Removed from the Twitchell tower for calibration. Replaced by sn 0035.
2012-05-07 75H-2150 LI-7500A Installed Gas Analyzer CO2/H2O Installed with AIU-0614 swapping out old LI7500 system.
2012-10-29 75H-2150 LI-7500A Calibration Lab 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.
2012-09-06 75H-2150 LI-7500A Removed Gas Analyzer CO2/H2O Removed from the Twitchell tower for calibration. Replaced by 2176.
2012-10-29 75H-2150 LI-7500A Calibration Lab 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.
2014-06-26 75H-2150 LI-7500A Installed Gas Analyzer CO2/H2O Installed on the Twitchell tower to replace sn 75H-2182 for calibration.
2014-12-22 75H-2150 LI-7500A Calibration Lab 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:
2014-09-25 75H-2150 LI-7500A Removed Gas Analyzer CO2/H2O Removed from the Twitchell tower for calibration. Replaced by sn 75H-2176.
2014-12-22 75H-2150 LI-7500A Calibration Lab 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:
2014-12-23 75H-2150 LI-7500A Installed Gas Analyzer CO2/H2O Installed on the Twitchell Rice Tower to replace sn 75H-2176 for calibration.
2015-07-15 75H-2150 LI-7500A Calibration Lab 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:
2015-01-20 75H-2150 LI-7500A Installed Gas Analyzer CO2/H2O Installed on the Rice tower to replace sn 0065 and matches the coefficients loaded on the 7550 box.
2015-07-15 75H-2150 LI-7500A Calibration Lab 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:
2015-05-07 75H-2150 LI-7500A Removed Gas Analyzer CO2/H2O Removed from the Twitchell Rice tower for calibration. Replaced by sn 75H-2514
2015-07-15 75H-2150 LI-7500A Calibration Lab 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:
2017-03-15 75H-2150 LI-7500A Installed Gas Analyzer CO2/H2O Installed at Twitchell Rice to replace sn 75H-2182.
2017-05-30 75H-2150 LI-7500A Calibration Lab 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:
2017-04-10 75H-2150 LI-7500A Installed Gas Analyzer CO2/H2O Added to the Vaira eddy tower for the Ameriflux inter-comparison and the transition to newer LI-7500A eddy systems.
2017-05-30 75H-2150 LI-7500A Calibration Lab 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:
2012-09-06 75H-2176 LI-7500A Installed Gas Analyzer CO2/H2O Installed to replace sn 2150 for calibration. The 7550 box was swapped at the same time because the existing box (sn 0614) could not accept new heads. AIU-0674 went on the tower.
2013-02-05 75H-2176 LI-7500A Calibration Lab Last calibration: 2012-08-29 AGC= SDM= DAC1= DAC2= Ambient P=kPa, Tair=C, Tdew=C at psi, at Tdewspan= CO2 zero 0.8694 -> 0.8676 Offset: ppm CO2 span 1.0152 -> 1.0038 Offset: ppm H2O zero 0.8534 -> 0.8539 Offset: ppm H2O span 0.9979 -> 0.9906 Offset: ppm Notes: Factory calibration
2013-01-03 75H-2176 LI-7500A Removed Gas Analyzer CO2/H2O Removed from the Twitchell Rice tower for calibration and to swap out the 7550 box (sn 0674) for repair of the condensation problem. Replaced by sn 2180 and AIU-0614.
2013-02-05 75H-2176 LI-7500A Calibration Lab Last calibration: 2012-08-29 AGC= SDM= DAC1= DAC2= Ambient P=kPa, Tair=C, Tdew=C at psi, at Tdewspan= CO2 zero 0.8694 -> 0.8676 Offset: ppm CO2 span 1.0152 -> 1.0038 Offset: ppm H2O zero 0.8534 -> 0.8539 Offset: ppm H2O span 0.9979 -> 0.9906 Offset: ppm Notes: Factory calibration
2013-08-28 75H-2176 LI-7500A Installed Gas Analyzer CO2/H2O Installed on the Twitchell Rice tower to replace sn 0065 for calibration
2014-03-17 75H-2176 LI-7500A Calibration Lab Last calibration: 2013-08-27 AGC=88.4 SDM=1 DAC1=- DAC2=- Ambient P=100.31kPa, Tair=24.17C, Tdew=0.47C Zero Air at 1400psi, God CO2 421.22 at 1550 Tdewspan=15.22 CO2 zero 0.8685 -> 0.8687 Offset: 1.42ppm CO2 span 1.0099 -> 1.0113 Offset: -0.84ppm H2O zero 0.8539 -> 0.8531 Offset: 1.4ppm H2O span 1 -> 0.9904 Offset: 0.49ppm Notes: Calibrated by Joe. Initially calibrated on March 12th but had very large offsets. I discovered that very small changes in SS caused by the hood (~4%) caused about 50ppm changes in CO2. A second calibration on the 17th was much better.
2014-03-07 75H-2176 LI-7500A Removed Gas Analyzer CO2/H2O Removed from the Twitchell Rice tower for calibration. Replaced by sn 75H-2182.
2014-03-17 75H-2176 LI-7500A Calibration Lab Last calibration: 2013-08-27 AGC=88.4 SDM=1 DAC1=- DAC2=- Ambient P=100.31kPa, Tair=24.17C, Tdew=0.47C Zero Air at 1400psi, God CO2 421.22 at 1550 Tdewspan=15.22 CO2 zero 0.8685 -> 0.8687 Offset: 1.42ppm CO2 span 1.0099 -> 1.0113 Offset: -0.84ppm H2O zero 0.8539 -> 0.8531 Offset: 1.4ppm H2O span 1 -> 0.9904 Offset: 0.49ppm Notes: Calibrated by Joe. Initially calibrated on March 12th but had very large offsets. I discovered that very small changes in SS caused by the hood (~4%) caused about 50ppm changes in CO2. A second calibration on the 17th was much better.
2014-09-25 75H-2176 LI-7500A Installed Gas Analyzer CO2/H2O Installed on the Twitchell tower to replace sn 75H-2150 for calibration.
2015-01-06 75H-2176 LI-7500A Calibration Lab Last calibration: 2014-09-23 AGC=90.0 SDM=1 DAC1=- DAC2=- Ambient P=101.28kPa, Tair=22.82C, Tdew=5.69C Zero Air at 950psi, God CO2 421.22 at 1300 Tdewspan=15.95 CO2 zero 0.8685 -> 0.8691 Offset: 2.56ppm CO2 span 1.0145 -> 1.0215 Offset: -3.66ppm H2O zero 0.8547 -> 0.8559 Offset: 6.6ppm H2O span 1.0075 -> 1.0099 Offset: -0.05ppm Notes:
2014-12-23 75H-2176 LI-7500A Removed Gas Analyzer CO2/H2O Removed from the Twitchell Rice tower for calibration. Replaced by sn 75H-2150.
2015-01-06 75H-2176 LI-7500A Calibration Lab Last calibration: 2014-09-23 AGC=90.0 SDM=1 DAC1=- DAC2=- Ambient P=101.28kPa, Tair=22.82C, Tdew=5.69C Zero Air at 950psi, God CO2 421.22 at 1300 Tdewspan=15.95 CO2 zero 0.8685 -> 0.8691 Offset: 2.56ppm CO2 span 1.0145 -> 1.0215 Offset: -3.66ppm H2O zero 0.8547 -> 0.8559 Offset: 6.6ppm H2O span 1.0075 -> 1.0099 Offset: -0.05ppm Notes:
2016-02-25 75H-2176 LI-7500A Installed Gas Analyzer CO2/H2O Installed on the Twitchell Rice tower to replace sn 75H-2182 for calibration.
2016-06-03 75H-2176 LI-7500A Calibration Lab Last calibration: 2016-02-22 AGC=90.7 SDM=6 DAC1=- DAC2=- Ambient P=100.05kPa, Tair=24.56C, Tdew=12.80C Zero Air at 500psi, God CO2 421.22 at 500 Tdewspan=15.08 CO2 zero 0.8692 -> 0.8688 Offset: -1.68ppm CO2 span 1.0205 -> 1.0175 Offset: 1.63ppm H2O zero 0.8564 -> 0.8571 Offset: 4.3ppm H2O span 1.0136 -> 1.0281 Offset: -0.3ppm Notes: The spars were very dirty with clinging dust.
2016-05-24 75H-2176 LI-7500A Removed Gas Analyzer CO2/H2O Removed from Twitchell Rice tower for calibration and replaced with sn 0065
2016-06-03 75H-2176 LI-7500A Calibration Lab Last calibration: 2016-02-22 AGC=90.7 SDM=6 DAC1=- DAC2=- Ambient P=100.05kPa, Tair=24.56C, Tdew=12.80C Zero Air at 500psi, God CO2 421.22 at 500 Tdewspan=15.08 CO2 zero 0.8692 -> 0.8688 Offset: -1.68ppm CO2 span 1.0205 -> 1.0175 Offset: 1.63ppm H2O zero 0.8564 -> 0.8571 Offset: 4.3ppm H2O span 1.0136 -> 1.0281 Offset: -0.3ppm Notes: The spars were very dirty with clinging dust.
2013-01-03 75H-2180 LI-7500A Installed Gas Analyzer CO2/H2O Installed on the Twitchell Rice tower with AIU-0614 to swap out sn 2176 for calibration and AIU-0674 for repair of the condensation problem.
2013-05-20 75H-2180 LI-7500A Calibration Lab Last calibration: 2012-12-12 AGC=90 SDM=1 DAC1=- DAC2=- Ambient P=100.46kPa, Tair=27.2C, Tdew=12C Zero air at 1800psi, CO2 in air 421.22 at 1700 Tdewspan=15 CO2 zero 0.9145 -> 0.9133 Offset: -5.41ppm CO2 span 1.009 -> 1.0091 Offset: 0.07ppm H2O zero 0.8788 -> 0.8840 Offset: 33.6ppm H2O span 0.9989 -> 0.9991 Offset: 0.1ppm Notes: Upgraded firmware to version 6.5.2 (on box SN 0674) and now using new interface version 6.5.0. Re-entered calibration coefficients from last factory calibration (12/12/12) since we forgot to save the config file last time.
2013-05-09 75H-2180 LI-7500A Removed Gas Analyzer CO2/H2O Removed from the Twitchell Rice tower for calibration. Replaced by sn0065
2013-05-20 75H-2180 LI-7500A Calibration Lab Last calibration: 2012-12-12 AGC=90 SDM=1 DAC1=- DAC2=- Ambient P=100.46kPa, Tair=27.2C, Tdew=12C Zero air at 1800psi, CO2 in air 421.22 at 1700 Tdewspan=15 CO2 zero 0.9145 -> 0.9133 Offset: -5.41ppm CO2 span 1.009 -> 1.0091 Offset: 0.07ppm H2O zero 0.8788 -> 0.8840 Offset: 33.6ppm H2O span 0.9989 -> 0.9991 Offset: 0.1ppm Notes: Upgraded firmware to version 6.5.2 (on box SN 0674) and now using new interface version 6.5.0. Re-entered calibration coefficients from last factory calibration (12/12/12) since we forgot to save the config file last time.
2016-08-31 75H-2180 LI-7500A Installed Gas Analyzer CO2/H2O Installed on the Twitchell Rice tower to replace sn 0065 for calibration.
2016-12-23 75H-2180 LI-7500A Calibration Lab Last calibration: 2016-08-30 AGC=99.5 SDM=6 DAC1=- DAC2=- Ambient P=99.4kPa, Tair=16.12C, Tdew=9.33C Zero Air at 300psi, God CO2 421.22 at 400 Tdewspan=14.00 CO2 zero 0.9142 -> 0.9145 Offset: 1.55ppm CO2 span 1.0227 -> 1.0287 Offset: -3.1ppm H2O zero 0.8858 -> 0.8836 Offset: -13.6ppm H2O span 1.0211 -> 1.0124 Offset: 0.17ppm Notes:
2016-12-21 75H-2180 LI-7500A Removed Gas Analyzer CO2/H2O Removed from Twitchell Rice for calibration in the lab. Replaced by 75H-2182.
2016-12-23 75H-2180 LI-7500A Calibration Lab Last calibration: 2016-08-30 AGC=99.5 SDM=6 DAC1=- DAC2=- Ambient P=99.4kPa, Tair=16.12C, Tdew=9.33C Zero Air at 300psi, God CO2 421.22 at 400 Tdewspan=14.00 CO2 zero 0.9142 -> 0.9145 Offset: 1.55ppm CO2 span 1.0227 -> 1.0287 Offset: -3.1ppm H2O zero 0.8858 -> 0.8836 Offset: -13.6ppm H2O span 1.0211 -> 1.0124 Offset: 0.17ppm Notes:
2014-03-07 75H-2182 LI-7500A Installed Gas Analyzer CO2/H2O Installed on the Twitchell Rice tower to replace sn 75H-2176 for calibration.
2014-08-25 75H-2182 LI-7500A Calibration Lab Last calibration: 2014-02-28 AGC=83.4 SDM=1 DAC1=- DAC2=- Ambient P=99.77kPa, Tair=23.79C, Tdew=12.26C Zero Air at 1000psi, God CO2 421.22 at 1300 Tdewspan=15.25 CO2 zero 0.8815 -> 0.8816 Offset: 0.90ppm CO2 span 1.0064 -> 1.0074 Offset: -0.54ppm H2O zero 0.8476 -> 0.8463 Offset: -7.7ppm H2O span 0.9875 -> 1.0039 Offset: -0.33ppm Notes:
2014-06-26 75H-2182 LI-7500A Removed Gas Analyzer CO2/H2O Removed from the Twitchell tower for calibration. Replaced by sn 75H-2150.
2014-08-25 75H-2182 LI-7500A Calibration Lab Last calibration: 2014-02-28 AGC=83.4 SDM=1 DAC1=- DAC2=- Ambient P=99.77kPa, Tair=23.79C, Tdew=12.26C Zero Air at 1000psi, God CO2 421.22 at 1300 Tdewspan=15.25 CO2 zero 0.8815 -> 0.8816 Offset: 0.90ppm CO2 span 1.0064 -> 1.0074 Offset: -0.54ppm H2O zero 0.8476 -> 0.8463 Offset: -7.7ppm H2O span 0.9875 -> 1.0039 Offset: -0.33ppm Notes:
2015-11-25 75H-2182 LI-7500A Installed Gas Analyzer CO2/H2O Installed on the Twitchell Rice tower to replace sn 0065 for calibration
2016-04-11 75H-2182 LI-7500A Calibration Lab Last calibration: 2015-11-10 AGC=87.6 SDM=6 DAC1=- DAC2=- Ambient P=100.48kPa, Tair=18.11C, Tdew=9.67C Zero Air at 600psi, God CO2 421.22 at 500 Tdewspan=11.09 CO2 zero 0.8833 -> 0.8832 Offset: -0.23ppm CO2 span 1.0197 -> 1.0198 Offset: -0.02ppm H2O zero 0.8464 -> 0.8466 Offset: 0.8ppm H2O span 1.0242 -> 1.0138 Offset: 0.21ppm Notes: Firmware on AIU-0614 updated from v7.3.0 to v8.0.0 just before calibration
2016-02-25 75H-2182 LI-7500A Removed Gas Analyzer CO2/H2O Removed from the Twitchell Rice tower for calibration. Replaced by sn 75H-2176
2016-04-11 75H-2182 LI-7500A Calibration Lab Last calibration: 2015-11-10 AGC=87.6 SDM=6 DAC1=- DAC2=- Ambient P=100.48kPa, Tair=18.11C, Tdew=9.67C Zero Air at 600psi, God CO2 421.22 at 500 Tdewspan=11.09 CO2 zero 0.8833 -> 0.8832 Offset: -0.23ppm CO2 span 1.0197 -> 1.0198 Offset: -0.02ppm H2O zero 0.8464 -> 0.8466 Offset: 0.8ppm H2O span 1.0242 -> 1.0138 Offset: 0.21ppm Notes: Firmware on AIU-0614 updated from v7.3.0 to v8.0.0 just before calibration
2016-12-21 75H-2182 LI-7500A Installed Gas Analyzer CO2/H2O Installed at Twitchell Rice after calibration in the lab to replace 75H-2180.
2017-04-20 75H-2182 LI-7500A Calibration Lab Last calibration: 2016-12-19 AGC=87.9 SDM= DAC1= DAC2= Ambient P=101.1kPa, Tair=22.4C, Tdew=8.19C Zero Air at 1600psi, NOAA CO2 513.22 at 350 Tdewspan=16.00 CO2 zero 0.8837 -> 0.8838 Offset: 0.12ppm CO2 span 1.0207 -> 1.0164 Offset: -2.98ppm H2O zero 0.8457 -> 0.8454 Offset: -1.9ppm H2O span 1.0186 -> 1.0139 Offset: 0.1ppm Notes:
2017-03-15 75H-2182 LI-7500A Removed Gas Analyzer CO2/H2O Removed from Twitchell Rice and brought back to the lab for calibration. It was replaced by 75H-2150.
2017-04-20 75H-2182 LI-7500A Calibration Lab Last calibration: 2016-12-19 AGC=87.9 SDM= DAC1= DAC2= Ambient P=101.1kPa, Tair=22.4C, Tdew=8.19C Zero Air at 1600psi, NOAA CO2 513.22 at 350 Tdewspan=16.00 CO2 zero 0.8837 -> 0.8838 Offset: 0.12ppm CO2 span 1.0207 -> 1.0164 Offset: -2.98ppm H2O zero 0.8457 -> 0.8454 Offset: -1.9ppm H2O span 1.0186 -> 1.0139 Offset: 0.1ppm Notes:
2015-05-07 75H-2514 LI-7500A Installed Gas Analyzer CO2/H2O Installed on the Twitchell Rice tower to replace sn 75H-2150 for calibration.
2015-08-18 75H-2514 LI-7500A Calibration Lab Last calibration: 2015-05-05 AGC=102.6 SDM=6 DAC1=- DAC2=- Ambient P=99.98kPa, Tair=25.14C, Tdew=15.04C Zero Air at 700psi, God CO2 421.22 at 800 Tdewspan=11.08 CO2 zero 0.9058 -> 0.9053 Offset: -1.96ppm CO2 span 1.012 -> 1.0154 Offset: 2.68ppm H2O zero 0.8355 -> 0.8370 Offset: 10.8ppm H2O span 1.0238 -> 1.0154 Offset: 0.16ppm Notes:
2015-08-06 75H-2514 LI-7500A Removed Gas Analyzer CO2/H2O Removed from the Twitchell Rice tower for calibration. Replaced by sn 0065.
2015-08-18 75H-2514 LI-7500A Calibration Lab Last calibration: 2015-05-05 AGC=102.6 SDM=6 DAC1=- DAC2=- Ambient P=99.98kPa, Tair=25.14C, Tdew=15.04C Zero Air at 700psi, God CO2 421.22 at 800 Tdewspan=11.08 CO2 zero 0.9058 -> 0.9053 Offset: -1.96ppm CO2 span 1.012 -> 1.0154 Offset: 2.68ppm H2O zero 0.8355 -> 0.8370 Offset: 10.8ppm H2O span 1.0238 -> 1.0154 Offset: 0.16ppm Notes:
2010-05-05 TG1-0100 LI-7700 Installed Gas Analyzer CH4 Received from Liukang Xu of licor. Installed on the Twitchell tower. Single ended analog outs are being used to record the LI7700 data on the CR1000: Channel 0V 5V wire CH4 (mmol/m3) 0.05 0.15 wht CH4 (ppm) 1 5 brn Pressure (kPa) 90 110 grn Temperature (C) 0 50 yel RSSI (%) 0 100 gry The mirrors are set to clean at an RSSI value of 20%. USB logging is set up at 10Hz.
2010-05-20 TG1-0100 LI-7700 Removed 0 The Li7700 was removed from the Twitchell tower for installation on the Levee tower at Sherman.
2010-06-16 TG1-0100 LI-7700 Removed Gas Analyzer CH4 The Li7700 was removed from the Sherman Island cow pasture tower and brought to Twitchell Rice for calibration.
2010-06-16 TG1-0100 LI-7700 Calibration Gas Analyzer CH4 Clibrated in the field with grade 5.0 ultra pure N2 and 3.276ppm CH4 secondary standard. zero before: ~0.009 ppm zero after: ~0.000 ppm span before: ~3.333 ppm span after: ~3.277 ppm
2010-06-16 TG1-0100 LI-7700 Installed Gas Analyzer CH4 Moved from Twitchell Rice to Frank's tower in the middle of East Pond. It did not power up, so we brought it back to the lab.
2010-07-28 TG1-0100 LI-7700 Removed Gas Analyzer CH4 I removed the LI7700 from the Sherman tower for installation at Twitchell.
2010-09-21 TG1-0100 LI-7700 Removed Gas Analyzer CH4 Removed from the Twitchell Rice tower for zero flux experiment at Moffett Field
2012-01-17 TG1-0211 LI-7700 Installed Gas Analyzer CH4 Installed on the Twitchell tower with the old 7550 box (sn AIU-0397). Connected to the CR1000 by SDM.
2012-09-06 TG1-0211 LI-7700 Calibration Gas Analyzer CH4 Calibration Location: Twitchell Last calibration: 2011-12-03 RSSI=63%, Optical RH=% Ambient P=101.45kPa, Tair=22.5C ultra zero air at 1900psi, ch4 in air 4.982 at 950 CH4 Zero Offset: 0.050ppm CH4 Span Offset: -0.002ppm Notes: Calibrated on the Twitchell tower by Joe and Cove. Last cal is the original done by Licor.
2013-02-21 TG1-0211 LI-7700 Calibration Gas Analyzer CH4 Calibration Location: Twitchell Last calibration: 2012-09-06 RSSI=65%, Optical RH=6% Ambient P=102.1kPa, Tair=7.87C Zero Air at 1800psi, 2nd CH4 in Air 4.982 at 1300 CH4 Zero Offset: 0.005ppm CH4 Span Offset: 0.018ppm Notes:
2013-08-21 TG1-0211 LI-7700 Calibration Gas Analyzer CH4 Calibration Location: Twitchell Last calibration: 2013-02-21 RSSI=64%, Optical RH=13% Ambient P=101.2kPa, Tair=18.3C Zero Air at 1750psi, CH4 in air 4.995 at 1300 CH4 Zero Offset: 0.01ppm CH4 Span Offset: -0.025ppm Notes: It was windy but seemed to have no effect. The concentration of the secondary ch4 standard has been reevaluated since last cal. Last time 4.982, now 4.995
2014-03-07 TG1-0211 LI-7700 Calibration Gas Analyzer CH4 Calibration Location: Twitchell Last calibration: 2013-08-21 RSSI=63%, Optical RH=17% Ambient P=102.1kPa, Tair=18.5C Zero Air at 1600psi, 2nd CH4 4.995 at 1100 CH4 Zero Offset: 0.01ppm CH4 Span Offset: 0.004ppm Notes: Calibrated by Cove and Sara. Firmware upgraded to v1.0.21 after calibration. Windy day.
2014-09-10 TG1-0211 LI-7700 Calibration Gas Analyzer CH4 Calibration Location: Twitchell Last calibration: 2014-03-07 RSSI=69%, Optical RH=22% Ambient P=kPa, Tair=25.9C Zero Air at 1400psi, 2nd CH4 4.995 at 800 CH4 Zero Offset: 0.07ppm CH4 Span Offset: -0.075ppm Notes: Very warm day with no wind. Offsets seem a little large.
2015-03-24 TG1-0211 LI-7700 Calibration Gas Analyzer CH4 Calibration Location: Twitchell Last calibration: 2014-09-10 RSSI=56%, Optical RH=25% Ambient P=102.5kPa, Tair=18.8C Zero air at 1200psi, 2nd CH4 4.995 at 600 CH4 Zero Offset: -0.05ppm CH4 Span Offset: 0.065ppm Notes: Very windy
2015-09-30 TG1-0211 LI-7700 Calibration Gas Analyzer CH4 Calibration Location: Twitchell Rice Last calibration: 2015-03-24 RSSI=70.8%, Optical RH=17% Ambient P=101.6kPa, Tair=17.1C Zero Air at 1100psi, AMP CH4 1.9966 at 1550 CH4 Zero Offset: 0.0015ppm CH4 Span Offset: -0.0006ppm Notes: light, sporadic rain
2016-04-13 TG1-0211 LI-7700 Calibration Gas Analyzer CH4 Calibration Location: Twitchell Rice Last calibration: 2015-09-30 RSSI=66.1%, Optical RH=23% Ambient P=102.1kPa, Tair=18.6C Zero Air at 1000psi, AMP CH4 1.9966 at 950 CH4 Zero Offset: 0.018ppm CH4 Span Offset: -0.010ppm Notes: Gusty breeze, mirrors hard to get clean.
2016-10-11 TG1-0211 LI-7700 Calibration Gas Analyzer CH4 Calibration Location: Twitchell Rice Last calibration: 2016-04-13 RSSI=68.0%, Optical RH=26% Ambient P=101.6kPa, Tair=20.8C zero air at 850psi, AMP CH4 4.030 at 1600 CH4 Zero Offset: -0.01ppm CH4 Span Offset: 0.021ppm Notes: windy, rice just harvested, tower out of field.
2017-04-04 TG1-0211 LI-7700 Removed Gas Analyzer CH4 Removed from Twitchell Rice site with Twitchell Rice decommissioning.
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