Equipment and Calibration History

History for Licor LI-7500RS 75H-2932

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.