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Equipment and Calibration

Equipment Entry

Instrument:	Gas Analyzer
Manufacture:	Licor
Model No:	LI-7700
Serial No:	TG1-0100
Tag No:	NULL
Acquisition Date:	2010-05-05
Project:	DWR-Rice
Location on 2011-03-12:	Returned, NULL
Notes:	LI7700 open-path methane sensor on loan to us from Licor.

Documents

Manual: Collecting_LI-7700_Ethernet_Data.pdf
Manual: LI-7700_Manual_V2_201103.pdf
Manual: LI-7700_Manual_V3_201312.pdf
Other: UCB_LI7700Testing.pdf

History

Rec No.	Date	Loc From	Title	Loc To	Notes
324	2011-03-12	Factory	Calibration	Factory	Zero = -8.76433 Span = 0.000099534 lasermoddepth = 14200 laserstarttemp = 22.57 blockstrattemp = 30 blockstarttemplowrange = 5 rssidropthresh = 0 pzero = 57.02 pspan = 15.25 samplegain = 0 refgain = 0 mirrorpos = 0 offset1 = 32768 delta1 = 58 offset2 = 0 delta2 = 0 dither = 30000 sampledcoffset = 241 sampleacoffset = -1392 sampleopticaloffset = 0
763	2011-01-31	Lab none	Returned	Factory	Returned to Licor after having been loaned to us since last May.
762	2011-01-28	Mayberry Tower	Removed	Lab none	Removed from the Mayberry tower for return to Licor. No CH4 at Mayberry until the new 7700 (sn TG1-0211) is ready to go next week.
232	2010-10-14	Lab none	Installed	Mayberry Tower	The LI7700 was installed on a new tower at the new Mayberry wetlands site.
231	2010-10-13	Lab none	Calibration	Lab none	Clibrated in the lab with grade 5.0 ultra pure N2 (40psi to empty) and 1.8978ppm CH4 god bottle (300psi). New fine wire thermocouple installed before calibration. Mirrors cleaned with rubbing alcohol and soft cloth. Air T=27.9C, P=100.55kPa, RSSI=78% Zero seemed right on flucuating about 5ppb around zero. I did not set the zero. The span was a little off reading 1.842ppm about 50ppb short. I set the span. I checked it with a scondary CH4 standard determined with an LGR at 4.982ppm CH4. The Li7700 read 5.050.
233	2010-09-29	Moffett Field none	Removed	Lab none	Removed with the temporary tower from the Moffett Field experiement.
4142	2010-09-21	Twitchell Rice Gas Analyzer CH4	Removed	Lab none	Removed from the Twitchell Rice tower for zero flux experiment at Moffett Field
313	2010-07-28	Sherman Island Gas Analyzer CH4 Open-path	Removed	Twitchell Rice Gas Analyzer CH4	I removed the LI7700 from the Sherman tower for installation at Twitchell.
4538	2010-07-08	Loaned none	Installed	Sherman Island Gas Analyzer CH4 Open-path	Moved from Frank's tower in the middle of East pond to Sherman Island.
319	2010-06-22	Lab none	Installed	Loaned none	Installed at Frank's tower in the middle of East Pond.
302	2010-06-16	Twitchell Rice Gas Analyzer CH4	Installed	Lab none	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.
301	2010-06-16	Twitchell Rice Gas Analyzer CH4	Calibration	Twitchell Rice 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
240	2010-06-16	Sherman Island Gas Analyzer CH4 Open-path	Removed	Twitchell Rice Gas Analyzer CH4	The Li7700 was removed from the Sherman Island cow pasture tower and brought to Twitchell Rice for calibration.
238	2010-05-28	Sherman Island-Levee Gas Analyzer CH4	Removed	Sherman Island Gas Analyzer CH4 Open-path	Removed from the Sherman Levee tower for installation on the Sherman Tower at the cow pasture.
317	2010-05-20	Twitchell Rice 0	Removed	Sherman Island-Levee Gas Analyzer CH4	The Li7700 was removed from the Twitchell tower for installation on the Levee tower at Sherman.
316	2010-05-05	Lab none	Installed	Twitchell Rice 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.