CUH Precision AQ Station : NOx Gas Cylinder (NO)
18 November 2020
18/11/20 Bottle was changed during the Six Month Service because it has been losing concentration since 28/09/20
Old Cylinder No : D115884 NO 435ppb, Nox 436ppb, +/-22ppb, Press 2800).
New Cylinder No : 12974, Pres 2800 psi, Concentration 492(NO), 493 (Nox)
See Airmonitors Engineer Six month report for details