Low Pressure Nitrogen Purge Alarm A333-N2R


NFPA 99 mandates the continuous monitoring of purge gas during the brazing process, by means of an audible alarm, a pressure regulator and flowmeter.
The A333-N2R meets these requirements. The complete unit offers an alarm with both visual and audible signals, and a combination regulator/ flowmeter.

Due to overwhelming demand for this product, only phone  orders accepted.





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 regulator/flowmeter hose connection is 5/8″-18 Right Hand External “B”.   An adapter can be used to convert this regulator/flowmeter connection to 1/4″ NPT Male.  Sold separately on this site.

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

Additional information

Weight 5 lbs
Dimensions 16 × 8 × 6 in