Pegasus Nitrogen and Oxygen Standard Low-Pressure Alarm Gauges come with a built-in audio and visual alarm. When your tank pressure reaches 500 PSI or less the gauge triggers an audible buzzer and a flashing red light. Pegasus Alarm Gauges are suitable for hospital, transport, nursing homes, home care, laboratories, physicians offices, or any situation where tank/line pressure is an important factor.
The NFPA 99 requires that any time an Oxygen line is purged, especially for Medical Gas installations and modifications, that the purge gas pressure be monitored with an alarm device. The LO-N2 gauge alarm has been used extensively for this purpose. It is the only reliable, inexpensive, and convenient device that meets this need.