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Equipment and Calibration

Equipment Entry

Instrument:	Gas Analyzer
Manufacture:	Licor
Model No:	LI-7500RS
Serial No:	75H-2932
Tag No:
Acquisition Date:	2025-05-07
Project:	CSUEB
Location on 2025-06-02:	Lab,
Notes:	Brought to the lab from Eden landing by Patty. To be tested, and calibrated. Probably bought by Patty in 2020

Documents

No documents found

History

Rec No.	Date	Loc From	Title	Loc To	Notes
7278	2025-06-13	Lab	Calibration	Lab	Last calibration: 2025-06-02 AGC=100.1 SDM=7 DAC1=- DAC2=- AIU sn AIU-2652, Presure A0=59.516, A1=15.503 Ambient P=100.4kPa, Tair=16.3C, Tdew=11.1C Zero Air at 1800psi, AMP CA04396 417.61 at 1200 Tdewspan=14.00 CO2 zero 1.0844 -> 1.0844 Offset: 3.27ppm CO2 span 1.0078 -> 1.0078 Offset: 4.33ppm H2O zero 1.043 -> 1.0430 Offset: 6.5ppm H2O span 1.0497 -> 1.0497 Offset: 14.63ppm Notes: I reset the SS from 103.9 to 100 before calibration. This 7500 has a brand new base plate because the old one had corrosion inside on of the plug tubes. I didn't end up pushing the calibrations buttons this time - it was reading a little high and the internal chemicals might still be scrubbing.
7265	2025-06-02	Lab	Calibration	Lab	Last calibration: 2023-05-21 AGC=102.4 SDM=7 DAC1=- DAC2=- AIU sn AIU-2652, Presure A0=59.516, A1=15.503 Ambient P=100.3kPa, Tair=21.3C, Tdew=10.9C Zero Air at 1900psi, AMP CA04395 417.61 at 1300 Tdewspan=16.0 CO2 zero 1.0837 -> 1.0844 Offset: 1.46ppm CO2 span 1.0058 -> 1.0078 Offset: -0.13ppm H2O zero 1.0414 -> 1.0430 Offset: 7.7ppm H2O span 1.0280 -> 1.0497 Offset: -0.44ppm Notes: I also got the original config file from Licor that had a date of 2020-01-28 and coefficients: CO2 zero 1.0837, CO2 span 1.0057, H2O zero 1.0420, H2O span 1.0367. Seemed like very stable robust calibration - no problems.
7264	2025-05-30	Lab none	Maintenance	Lab none	I inspected the 7500RS head. Lots of corrosion from salt at Eden Landing. The screw to hold/extract the desiccant plugs is broken off. One of these plugs was corroded and was damaged in removing it. The inside of this plug whole is also crumbling. I replaced the plug with one from an old 7500 base plate but I'm not sure the seal is great. I swapped the internal chemical - they where hard and needed a screw driver to scrape them out of the bottles. I put in new chemicals and let it run.