- changed the slopes on the NO and NOy instruments using site NO gas cylinder standard
- NOx was instrument is still not operating; half of BLC lamps not working; it needs to be replaced
- NOx instrument flow is very low (~150 cc/min) and pressure is also very low ~80 mm Hg; The autozero valve likely causing the problem
- No troubleshooting can be performed at site until Harris County restrictions are uplifted due to Corona virus
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