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Intrinsically safe Gas-Sentry Model CGA-501 monitors for combustible gas and oxygen with additional sensors for carbon monoxide and hydrogen sulfide are used for locating the source of combustible gases, testing and monitoring the safety of ambient air in confined and enclosed spaces. The CGA-501 four-gas monitor is designed to operate continuously for 40 hours on a set of four AA batteries.

The CGA-501 monitors combustible gas, carbon monoxide and hydrogen sulfide, and oxygen. All four gases are monitored continuously while the display shows the concentration of a particular gas selected by a front panel switch. The unit alerts audibly and visually if one or more gases are outside their alarm limits. The CGA-501 can be automatically zeroed and calibrated on the AUTOZERO scale in under 60 seconds with gas delivered either manually or by an automatic gas dispenser.

 

Long-lived sensors, a conformally coated circuit board, and a tough, high impact ABS case stand up in the field.