3-1/2" Air Gauge, 0-80/250 PSI (UL & FM Approved)

The Trerice SGRA80/250 is a 3-1/2" air-service retard sprinkler gauge designed for dry-pipe fire protection systems where system air pressure is low but water supply pressure is high. The gauge reads 0-80 PSI for monitoring typical dry-pipe system air pressure, while featuring a 250 PSI retard to protect the gauge mechanism if water inadvertently enters the system and subjects the gauge to full supply pressure. This makes it ideally suited for systems where the differential pressure between air and water sides could otherwise damage a standard gauge. Constructed with a black polycarbonate case and window, an aluminum white-background dial with black and red graduations, and a 1/4" NPT lower male connection. Wetted parts are bronze Bourdon tube and brass socket. Accuracy is 3-2-3% per ASME B40.100 Grade B. UL-listed (UL-393, US & Canada) and FM Approved (Approval Standard 2311).

• UL-listed (UL-393, US & Canada) and FM Approved (Standard 2311)
• Air service with 250 PSI retard - protects gauge if water enters dry system
• 0-80 PSI operating range for dry-pipe air pressure monitoring
• 250 PSI retard provides overpressure protection
• 3-1/2" dial with white aluminum face, black and red graduations
• 3-2-3% accuracy per ASME B40.100 Grade B
• 1/4" NPT lower male connection
• Black polycarbonate case and window
• Bronze Bourdon tube with brass socket wetted parts
• Maximum operating temperature: 150F (65C)