Full definition
Instrument that provides real-time measurement of hazardous gas concentrations. Standard channels: O₂ (safe range 19.5-23.5%), combustibles (%LEL), CO (<25 ppm TWA, 200 ppm IDLH), H₂S (<1 ppm TWA, 100 ppm IDLH). Features audible, visual and vibration alarms. Mandatory before and during confined space entry. Daily bump test/calibration with certified reference gas. Leading brands: Industrial Scientific, MSA, Honeywell BW.