Low Pressure Nitrogen Purge Alarm A333-N2


NFPA 99 mandates the continuous monitoring of purge gas during the brazing process, by means of an audible alarm. The A333-N2 meets these requirements with both audible and visual signals.



The alarm is factory assembled of a rugged aluminum base and PVC enclosure and utilizes a pressure switch with a rating of 3000 psi. There is a Green blinking “OK” light when gas supply is adequate and a Red blinking “LOW” light when gas supply is low.  In addition, an audible alarm activates when purge gas is low.  The alarm operates on a 9-volt battery, included, which can give up to a year of operation, dependent upon usage.

The A332-N2 alarm does not include a flowmeter regulator.

This alarm is for high-pressure cylinders.  See our A333-CRYO for cryogenic applications.

Additional information

Weight 3 lbs
Dimensions 8 × 4 × 4 in