The PS40-EX is designed as a pressure type supervisory switch. The NFPA 72, National Fire Alarm Code, requires that a low pressure signal is sent at 10 psi below normal air pressure and 10 psi above normal pressure on dry pipe valves. Therefore, the PS40-2A switches are factory set for a pressure decrease at 30 psi and a pressure increase at 50 psi with a normal air pressure of 40 psi. The switches are adjustable at any point between 10 and 175 psi.
1350402 Specifications PDF
Product Reviews
Write your own review
Rate this product: