Equipment and Calibration

Equipment history at Twitchell Rice

| ALL | | Anemometer || Barometer || Battery Bank || Data Logger || DO Sensor || Gas Analyzer || Heat Flux Plate || Interface || Multiplexer || Net Radiometer || PAR Sensor || Precipitation || Pump || Pyranometer || RH & Temp || Scroll Pump || Soil Moisture Probe || Solar Controller || Solar Panel || Water Level |

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) ORDER BY b.equip, a.eh_date, field(a.eh_title,'Calibration', 'Removed', 'Installed')

Date	Serial No.	Model	Action	Ref	Notes
Anemometer
2009-04-03	000024	WMP 1352	Installed	Anemometer	Installed at the Rice. Z= 3.05 m at middle of path & North spar pointing to 318 magnetic. Need to apply Schotanus correction since model 1352.
2012-05-07	000024	WMP 1352	Removed	Anemometer	Removed from the tower. Replaced by the new DWR WM (sn ) with analog outs.
2012-05-07	120906	WM 1590	Installed	Anemometer	Installed at the rice to replace sn 000024
2017-01-17	153805	WM 1590	Installed	Anemometer	Installed on Twitchell Rice tower to replace sn 120906. We also replaced the sonic cable.
2017-01-19	120906	WM 1590	Removed	Anemometer	Removed from Twitchell Rice tower and returned to lab for firmware upgrade. It was replaced by sn 153805.
2017-04-04	153805	WM 1590	Removed	Anemometer	Removed with the decommissioning of the Twitchell Rice site.
Barometer
2009-05-21	E1330045	PTB110	Installed	Barometer	Installed at Twitchell Rice on May 21st 2009.
2014-06-12	E1330045	PTB110	Removed	Barometer	The sensor was giving bad reading so we replaced it with sn H0160093.
2014-06-12	H0160093	PTB110	Installed	Barometer	Installed at the rice to replace sn E1330045.
2017-04-04	H0160093	PTB110	Removed	Barometer	Removed with Twitchell Rice tower decommissioning.
Battery Bank
2014-09-10	BB-TW	BB-Fab	Upgrade		We moved the three old group 8D out of the way and installed the four group 27 batteries. I had two older batteries in the lab and bought two more. We also installed a new solar charger under the solar panels.
2015-12-28	BB-TW	BB-Fab	Upgrade		I added two batteries to the battery bank. I added two batteries from the lab. One form 5/14 and one from 5/11. Both tested okay in the lab. The existing batteries were two from 2/12 and two from 6/14.
2016-01-12	BB-TW	BB-Fab	Lost		The old 8D batteries, the solar charge controller were stolen along with the old solar panels that were on top on the big box. Power is down until the charge controller can be replaced.
2016-01-21	BB-TW	BB-Fab	Repair		The solar charge controller was replaced.
2017-06-01	BB-TW	BB-Fab	Removed		The Twitchell Rice solar system was disassembled and removed. Two of the batteries were dead and will be recycled. The four other batteries load tested okay and were taken to Tonzi for the Floor solar power system. The solar panels and charge controller were removed and will be used at the temporary tower at East End this summer.
Data Logger
2009-04-03	23865	CR1000	Installed	Data Logger Eddy	Installed with CFM sn 4993 on the new tower set up at the Twitchell Rice site.
2009-04-03	2303	CR23X	Installed	Data Logger Met	Installed with the initial set up of the Twitchell Rice tower
2012-05-07	23865	CR1000	Removed	Data Logger Eddy	Removed from the tower. No longer needed - data being collected by Li7550 box
2016-09-22	2115	CR6	Installed		Installed on an independent tripod at Twitchell Rice. This is part of a "golden" radiometers experiment to compare incoming PAR and SW across the delta
2016-10-06	2115	CR6	Removed		Removed from the Golden Radiometer experiment at Twtichell Rice.
2016-10-06	2113	CR6	Installed		Installed in the Golden Radiometer experiment at Twtichell Rice.
2016-10-20	2113	CR6	Moved		Moved with radiometer test tripod from Twitchell Rice to Vaira Ranch to compare against Ione sensors.
2017-04-04	2303	CR23X	Removed	Data Logger Met	Removed with the decommissioning of the Twitchell Rice site.
DO Sensor
2010-08-17	DO-1	CS511	Installed	DO Sensor	DO-01 was installed at the Twitchell Rice site.
2010-10-01	DO-1	CS511	Removed	DO Sensor	DO-01 was removed from the Twitchell Rice because the field has been drained an the probe was high and dry. It will be used at Mayberry.
2011-01-28	DO-2	CS511	Installed	DO Sensor	First installation of this sensor in the field.
2011-03-22	DO-2	CS511	Removed	DO Sensor	DO-02 was removed from the Twitchell Rice because the field has been drained an the probe was high and dry.
2011-05-13	DO-2	CS511	Installed	DO Sensor	DO-02 was installed in the Twitchell Rice.
2011-06-02	DO-2	CS511	Maintenance	DO Sensor	Jaclyn replaced the electrolyte and cleaned the sensor before putting it back in the field now that the field is flooded.
2011-07-28	DO-2	CS511	Removed	DO Sensor	Removed from the field after the cable was cut during the clearing of weeds.
2011-08-04	DO-2	CS511	Installed	DO Sensor	Reinstalled after splicing the cable to repair cut from weed clearing.
2011-09-22	DO-2	CS511	Removed	DO Sensor	DO-02 was removed from the Twitchell Rice because the field has been drained an the probe was high and dry.
2012-07-12	DO-06	DO6400/T	Installed	DO Sensor	This is DWR DO probe DO-06. It is being installed in the Twitchell Rice since we never bought a replacement for the one we moved to Mayberry.
2012-09-27	DO-06	DO6400/T	Removed	DO Sensor	DO-06 was removed from the Twitchell rice because it was high and dry after the field drained. This sensor my go to replace one at Mayberry that's been acting bad.
2013-01-03	DO-04	DO6400/T	Moved	DO Sensor	This sensor was moved from the upper location at West Pond to near the well at the Twitchell Rice. The sensor was left laying sideways on the bottom of the flooded field.
2013-02-21	DO-04	DO6400/T	Removed	DO Sensor	Removed from the now drained field at Tiwtchell. There will be no water in the field until after the rice is up late this coming spring.
2013-09-05	DO-06	DO6400/T	Removed	DO Sensor	Sensor pulled since field was drained.
2013-12-19	DO-06	DO6400/T	Installed	DO Sensor	re-installed DO at Twitchell Rice
2014-04-03	DO-06	DO6400/T	Removed	DO Sensor	Pulled sensor from Twitchell since field is drained
2014-06-12	DO-8	CS511	Installed	DO Sensor	Installed at the rice. DO-08 was calibrated in the field: M = 8.24/38.61 in (mg/L)/mV (aka ppm/mV) (@ 23C). The probe is 3 cm above the soil surface.
2014-09-10	DO-8	CS511	Removed	DO Sensor	Removed from the Twitchell rice because the field in drained.
2014-11-11	DO-8	CS511	Installed	DO Sensor	Re-installed at the rice.
2015-03-05	DO-8	CS511	Removed	DO Sensor	Removed from Twitchell Rice because the field is dry and we moved the tower for plowing
2015-11-25	DO-8	CS511	Installed	DO Sensor	Reinstalled at the Rice tower after being removed for fall draw down.
2016-04-13	DO-8	CS511	Removed	DO Sensor	Removed with tower from field for planting. Needs to be serviced in the lab and reinstalled when the field is flooded.
2016-08-12	DO-8	CS511	Installed	DO Sensor	Reinstalled at the Rice tower after being removed for spring draw down and calibration in the lab. Reconnected the sensor to port 9, reading 27mV when connected and immersed in water in well. DO sensor was ziptied about 6-8 inches from the top of the well.
2017-04-04	DO-8	CS511	Removed	DO Sensor	Removed with Twitchell Rice tower decommissioning.
Gas Analyzer
2009-06-04	08-0114	FMA RMT-200	Installed		Installed at the Rice.
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.
2009-08-06	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.
2009-08-06	09-0012	FGGA	Installed		Installed Frank's FGGA at the rice
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	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.
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
2010-01-14	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.
2010-03-04	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.
2010-03-18	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
2010-03-18	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
2010-04-08	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
2010-05-05	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.
2010-05-13	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
2010-05-20	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
2010-05-20	TG1-0100	LI-7700	Removed	0	The Li7700 was removed from the Twitchell tower for installation on the Levee tower at Sherman.
2010-05-28	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
2010-05-28	1594	LI-7500A	Installed	Gas Analyzer CO2/H2O	Installed on Twitchell tower after fresh lab calibration.
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.
2010-06-16	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	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	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.
2010-06-22	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
2010-07-28	TG1-0100	LI-7700	Removed	Gas Analyzer CH4	I removed the LI7700 from the Sherman tower for installation at Twitchell.
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.
2010-08-17	1594	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Twitchell tower for calibration.
2010-08-17	08-0114	FMA RMT-200	Installed		Installed at Twitchell to replace Frank's FGGA that is having problems.
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:
2010-09-08	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
2010-09-21	TG1-0100	LI-7700	Removed	Gas Analyzer CH4	Removed from the Twitchell Rice tower for zero flux experiment at Moffett Field
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.
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:
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.
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.
2011-01-18	05-0010	FMA RMT-200	Installed		Installed to replace our other LGR FMA that suffered a power problem.
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.
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.
2011-03-22	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
2011-05-25	1594	LI-7500A	Removed	Gas Analyzer CO2/H2O	Removed from the Twitchell tower for calibration. Replaced by sn 0035.
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:
2011-06-10	05-0010	FMA RMT-200	Removed		Removed from Twitchell island because it was hanging up during boot. Frank discovered it on June 6th.
2011-06-10	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
2011-08-25	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:
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
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.
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.
2012-01-17	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.
2012-01-25	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
2012-01-25	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
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.
2012-04-24	05-0010	FMA RMT-200	Removed		Removed from the box at Twitchell, replced with LI-7700
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.
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	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.
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.
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
2013-01-03	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.
2013-02-21	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:
2013-05-09	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.
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:
2013-08-21	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
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:
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	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.
2014-03-07	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.
2014-03-07	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:
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:
2014-09-10	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.
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:
2014-09-25	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:
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	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
2015-01-20	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:
2015-03-24	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
2015-05-07	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:
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:
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:
2015-09-30	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
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:
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
2016-02-25	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.
2016-04-13	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.
2016-05-24	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.
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.
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:
2016-10-11	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.
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:
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:
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:
2017-04-04	TG1-0211	LI-7700	Removed	Gas Analyzer CH4	Removed from Twitchell Rice site with Twitchell Rice decommissioning.
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:
Heat Flux Plate
2009-04-03	00243	HFP01SC	Installed	Heat Flux Plate B	Installed at the rice as SHF2 in channel 17 on the multiplexer. It's calibration coefficient is: 62.1 micrV/(W m-2)
2009-04-03	002211	HFP01	Installed	Heat Flux Plate D	Installed with the initial set up of the Twitchell Rice tower.
2009-04-03	00246	HFP01SC	Installed	Heat Flux Plate C	Installed with the initial set up of the Twitchell Rice tower.
2009-04-03	00244	HFP01SC	Installed	Heat Flux Plate A	Installed with the initial set up of the Twitchell Rice tower.
2011-10-27	00246	HFP01SC	Removed	Heat Flux Plate C	Removed from the field for repair of cracking cables in the lab.
2011-10-27	00244	HFP01SC	Removed	Heat Flux Plate A	Removed from the field to repair cracking cables in the lab.
2011-10-27	00243	HFP01SC	Removed	Heat Flux Plate B	Joe checked the wires on the SHF plates and found that they were rotting away. Brought back to the lab to fix.
2011-11-02	00246	HFP01SC	Installed	Heat Flux Plate C	Installed in the field after harvest and chopping. The cable was replaced due to cracking and the self calibration heater cable was shortened to a pig tail.
2011-11-02	00244	HFP01SC	Installed	Heat Flux Plate A	Installed in the field after harvest and chopping. The cable was replaced due to cracking and the self calibration heater cable was shortened to a pig tail.
2012-05-17	00244	HFP01SC	Removed	Heat Flux Plate A	I found this heat flux plate in the field. It had not been removed with the other ground sensors and got cut off by the tractor.
2012-09-06	002211	HFP01	Removed	Heat Flux Plate D	Removed from the Twitchell tower for calibration. This was #2 of three SHF plates.
2013-06-07	00243	HFP01SC	Installed	Heat Flux Plate A	Installed to replace the one cut off by a tractor (sn 00244). Installed in AM25T channel 16 (SHF1).
2014-11-16	00243	HFP01SC	Removed	Heat Flux Plate A	SHFP1 was removed from rice since reading INF. Joe will diagnose in lab.
2014-11-25	00243	HFP01SC	Installed	Heat Flux Plate A	Installed in multiplexer on channel 16. The heat flux plate was reading INF, so this needs to be looked at next time—I couldn’t diagnose the problem.
2014-12-10	00243	HFP01SC	Removed	Heat Flux Plate A	Removed from TW and brought back to the lab for troubleshooting
2015-04-09	10809	HFP01	Installed	Heat Flux Plate A	Installed at rice as SHF1 in mux channel 16
2015-04-09	10822	HFP01	Installed	Heat Flux Plate B	installed at rice as SHF2 in mux channel 17
2015-09-11	00246	HFP01SC	Removed	Heat Flux Plate C	The cable was broken when the plate along with the rest of the tower was moved from the field for harvest. The break is so close to the plate that it might not be repairable.
2015-09-30	6499	HFP01	Installed	Heat Flux Plate C	Installed when the tower was returned to the field after harvest to replace the plate that was broken when the tower was removed.
2017-04-04	10809	HFP01	Removed	Heat Flux Plate A	Removed with the decommissioning of the Twitchell Rice site.
2017-04-04	10822	HFP01	Removed	Heat Flux Plate B	Removed with the decommissioning of the Twitchell Rice site.
2017-04-04	6499	HFP01	Removed	Heat Flux Plate C	Removed with the decommissioning of the Twitchell Rice site.
Interface
2009-04-03	4993	CFM100	Installed		Installed with CR1000 sn 23865 on the new tower set up at the Twitchell Rice site.
2012-01-17	AIU-0397	LI-7550	Installed	Interface LI-7500	Installed with LI7700 sn TG1-0211. Connected to the CR1000 by SDM. This box came with LI7700 sn TG1-0155 and is not CO2/H2O enabled. This means the SDM interface provides the 7700 data.
2012-05-07	4993	CFM100	Removed		Removed from the Twitchell tower. No longer needed - data being collected by Li7550 box
2012-05-07	AIU-0397	LI-7550	Removed	Interface LI-7500	Removed from the Twitchell tower. Replaced with 7550 sn AIU-0614 and 7500A sn 2150.
2012-05-07	AIU-0614	LI-7550	Installed	Interface LI-7500	Installed on the Twitchell tower with 7500A head 2150 replacing AIU-0397. The eddy system was reconfigured to start collecting data on this 7550 box. The CR1000 and older model 7500 head and box were removed.
2012-09-06	AIU-0614	LI-7550	Removed	Interface LI-7500	Removed from the Twitchell tower with head 2150. Replaced with AIU-0674 and 2176 head. This box would enter a reboot cycled when I tried to swap heads. It will be tested in the lab.
2012-09-06	AIU-0674	LI-7550	Installed	Interface LI-7500	Installed on the Twitchell tower to replace sn 0614 that was having trouble accepting new heads. sn 0614 was removed to the lab for observation. Head 2150 was removed for calibration and head 2176 was swapped in.
2013-01-03	AIU-0674	LI-7550	Removed	Interface LI-7500	Reomved from the Twitchell Rice tower for repair of the condensation problem, replaced by AIU-0650. Heads swapped for calibration at the same time.
2013-01-03	AIU-0650	LI-7550	Installed	Interface LI-7500	Istalled on the Twitchell Rice tower to replace AIU-0674 for repair of the condensation problem.
2013-11-21	AIU-0650	LI-7550	Upgrade	Interface LI-7500	The firmware of the 7550 box was upgraded from v6.5.2 to v6.5.5 to fix bugs with the USB memory overwrite and synchronizing the 7700 clock.
2014-03-07	AIU-0650	LI-7550	Upgrade	Interface LI-7500	Updated the 7550 firmware from v6.5.5 to v7.0.1. Improved interface, support for SmartFlux, bug fixes.
2014-10-02	AIU-0650	LI-7550	Upgrade	Interface LI-7500	Updated the 7550 firmware from v7.0.1 to v7.3.0. Fixed bug that can cause the instrument to restart unexpectedly, added 7700 data to interface can view/log power Vin, other minor bug fixes.
2016-04-13	AIU-0650	LI-7550	Upgrade	Interface LI-7500	Updated the 7550 firmware from v7.3.0 to v8.0.0 skiping version 7.5.0 Relevant 7.5.0 changes: Main Window is now resizable, Added serial number entry for sonics, Help update, Fixed timeout when saving config files Relevant 8.0.0 changes: Separate bandwidth settings for analog inputs and gas channels, Detection of new RS instruments, Additional calibration coefficients, Added sonic software version entry, Added chopper temp logging
2017-04-10	AIU-0650	LI-7550	Installed	Interface LI-7500	Added to the Vaira eddy tower for the Ameriflux inter-comparison and the transition to newer LI-7500A eddy systems.
Multiplexer
2009-04-03	2856	AM25T	Installed	Multiplexer Thermocouple	Installed with the initial site set up.
2016-10-06	1238	AM16-32A	Installed		Installed in the Golden Radiometer experiment at Twtichell Rice.
2016-10-20	1238	AM16-32A	Moved		Moved with radiometer test tripod from Twitchell Rice to Vaira Ranch to compare against Ione sensors.
2017-04-04	2856	AM25T	Removed	Multiplexer Thermocouple	Removed with the decommissioning of the Twitchell Rice site.
Net Radiometer
2009-04-03	990352	NR-LITE	Installed	Net Radiometer	Installed with the initial set up of the Twitchell Rice tower.
2016-09-22	2420	NR01	Installed		Installed on an independent tripod at Twitchell Rice. This is part of a "golden" radiometers experiment to compare incoming PAR and SW across the delta
2016-10-06	1720	NR01	Installed		Installed in the Golden Radiometer experiment at Twtichell Rice.
2016-10-20	1720	NR01	Moved		Moved with radiometer test tripod from Twitchell Rice to Vaira Ranch to compare against Ione sensors.
2016-10-20	2420	NR01	Moved		Moved with radiometer test tripod from Twitchell Rice to Vaira Ranch to compare against Ione sensors.
2017-04-04	990352	NR-LITE	Removed	Net Radiometer	Removed with Twitchell Rice tower decommissioning.
PAR Sensor
2009-04-03	050596	PAR-LITE	Installed	PAR Sensor Reflected	Installed with the initial set up of the Twitchell Rice tower. This sensor is pointing down collecting reflected PAR.
2009-04-03	050597	PAR-LITE	Installed	PAR Sensor Incoming	Installed with the initial set up of the Twitchell Rice tower. This sensor is pointing up.
2016-09-22	140456	PQS 1	Installed		Installed on an independent tripod at Twitchell Rice. This is part of a "golden" radiometers experiment to compare incoming PAR and SW across the delta
2016-09-22	140457	PQS 1	Installed		Installed on an independent tripod at Twitchell Rice. This is part of a "golden" radiometers experiment to compare incoming PAR and SW across the delta
2016-09-22	Q100421	LI-190/R	Installed		Installed on an independent tripod at Twitchell Rice. This is part of a "golden" radiometers experiment to compare incoming PAR and SW across the delta
2016-10-06	140456	PQS 1	Removed		Removed from the Golden Radiometer experiment at Twtichell Rice.
2016-10-06	Q100421	LI-190/R	Removed		Removed from the Golden Radiometer experiment at Twtichell Rice.
2016-10-20	140457	PQS 1	Moved		Moved with radiometer test tripod from Twitchell Rice to Vaira Ranch to compare against Ione sensors.
2017-04-04	050597	PAR-LITE	Removed	PAR Sensor Incoming	Removed with Twitchell Rice tower decommissioning.
2017-04-04	050596	PAR-LITE	Removed	PAR Sensor Reflected	Removed with Twitchell Rice tower decommissioning.
Precipitation
2009-05-20	49187-109	TE525MM	Installed	Precipitaion	Installed at Twitchell Rice on a stake south east of the tower.
2011-10-27	49187-109	TE525MM	Removed	Precipitaion	Removed from Twitchell because the cable was cut some time during the summer.
2011-11-02	49187-109	TE525MM	Installed	Precipitaion	Reinstalled at Twitchell after the cable was spliced in the lab to repair a cut suffered in the field.
2017-04-04	49187-109	TE525MM	Removed	Precipitaion	Removed with the decommissioning of the Twitchell Rice site.
Pump
2012-04-24	03387648	N940-5APE.W	Removed		Removed from the box at Twitchell, replced with LI-7700
Pyranometer
2009-04-03	996985	CM11	Installed	Pyranometer	Installed with the initial set up of the Twitchell Rice tower.
2016-09-22	060039	CMP 11	Installed		Installed on an independent tripod at Twitchell Rice. This is part of a "golden" radiometers experiment to compare incoming PAR and SW across the delta
2016-10-20	060039	CMP 11	Removed	none	Removed from the Golden Radiometer experiment at Twitchell Rice and I assume brought back to the lab.
2017-04-04	996985	CM11	Removed	Pyranometer	Removed from Twitchell Rice site with Twitchell Rice decommissioning.
RH & Temp
2009-04-03	U3030046	HMP45AC	Installed	RH & Temp	This sensor was installed with the new eddy tower at Twitchell Rice.
2011-01-18	U3030046	HMP45AC	Removed	RH & Temp	This sensor was removed from the Twitchell tower because it was giving bad readings.
2011-01-18	U3030032	HMP45AC	Installed	RH & Temp	This sensor was checked in the lab against the Vaisala hand-held and was very close +-1C +-1%. It was then installed on the Twitchell tower to replace the one there that didn't seem to be working.
2013-08-28	U3030032	HMP45AC	Removed	RH & Temp	Removed from the Twitchell Rice tower due to bad looking RH readings. Need to be tested in the lab. Replaced by sn U3030046
2013-08-28	U3030046	HMP45AC	Installed	RH & Temp	Installed on the Twitchell tower to replace sn U3030032 that was removed for bad RH readings.
2017-04-04	U3030046	HMP45AC	Removed	RH & Temp	Removed with the decommissioning of the Twitchell Rice site.
Scroll Pump
2009-10-22	DG002	GVSP30	Installed		This pump was installed in the box at Twitchell Island to run the LGR FGGA there.
2010-02-04	DG002	GVSP30	Removed		This pump was removed from the box at Twitchell Island where it had been sitting idle.
Soil Moisture Probe
2009-04-03	54/001	ML2x	Installed	Soil Moisture Probe A	Installed at the Twitchell tower.
2009-04-03	139/052	ML2x	Installed	Soil Moisture Probe B	Installed with the Twitchell Rice tower.
2010-07-01	54/001	ML2x	Removed	Soil Moisture Probe A	The theta probe cable was cut while the grass around the tower and the box was being cut. The probe was removed to repair in the lab.
2011-07-07	139/052	ML2x	Removed	Soil Moisture Probe B	Removed from the field after it was discovered that otters had chewed its cable.
2011-09-15	54/001	ML2x	Installed	Soil Moisture Probe A	Probe re-installed at the rice. (Serial number not recorded in field notes, but by process of elimination, I can only assume it's this probe).
2011-09-15	139/052	ML2x	Installed	Soil Moisture Probe B	Probe re-installed at the rice. (Serial number not recorded in field notes, but by process of elimination, I can only assume it's this probe).
2012-07-26	139/052	ML2x	Removed	Soil Moisture Probe B	Removed from the Twitchell tower to be replaced by CS615 probes.
2012-07-26	54/001	ML2x	Removed	Soil Moisture Probe A	Removed from the Twitchell Rice tower to be replaced with a CS615 probe.
Solar Controller
2014-09-10	22678-0999	PS-30M	Removed		Removed from Twitchell Rice. This is the old looking controller and has been slow to start charging batteries. Replace with a new charge controller.
Solar Panel
2012-04-24	11ZV0M0828	KD140SX-UFBS	Installed		Installed to power the site. The solar panels are on the the wooden base to the north of the box. Old panels are disconnected
2012-04-24	11ZV0M0829	KD140SX-UFBS	Installed		Installed to power the site. The solar panels are on the the wooden base to the north of the box. Old panels are disconnected
2012-04-24	11ZV0M0835	KD140SX-UFBS	Installed		Installed to power the site. The solar panels are on the the wooden base to the north of the box. Old panels are disconnected
2017-06-01	11ZV0M0835	KD140SX-UFBS	Moved	0	Installed at the East End Temporary Tower #1 Open Water location with the initial set up of this site.
2017-06-01	11ZV0M0828	KD140SX-UFBS	Removed	0	Removed from the Twitchell Rice tower location (the tower was removed previously) for use at the East End temporary towers. This panel was left at the Temp 2 (closed vegetation) site to be installed later.
2017-06-01	11ZV0M0829	KD140SX-UFBS	Removed	0	Removed from the Twitchell Rice tower location (the tower was removed previously) for use at the East End temporary towers. This panel was left at the Temp 2 (closed vegetation) site to be installed later.
Water Level
2009-05-21	20010026	CS450	Installed	Water Level	Installed at the Twitchell Rice site
2011-07-07	20010026	CS450	Removed	Water Level	This senor was removed from the Twitchell tower after it was discovered that otters had chewed the cable.
2011-07-14	20010026	CS450	Installed	Water Level	Reinstalled in the field after repairs to the cable where otters had chewed on it. I spliced the wires and the tube that provides the atmospheric pressure reference.
2012-10-25	20010026	CS450	Moved	Water Level	Removed from the Twitchell tower since the well was dry and moved to the Mayberry Tule tower to replace the water pressure sensor that failed there.
2012-11-29	20010770	CS450	Installed	Water Level	This sensor was moved from the Corn tower to the Twitchell Rice tower.
2016-06-24	20010770	CS450	Removed	Water Level	Removed from the Twitchell Rice tower due to diurnal wave in the data. Replace with new sensor from DFW equipment
2016-06-24	70011236	CS451	Installed	Water Level	Installed on the Twitchell Rice tower to replace the existing sensor that had a diurnal wave in its data.
2017-04-04	70011236	CS451	Removed	Water Level	Removed with Twitchell Rice tower decommissioning.

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