PRESSURE SUPERVISORY SWITCH
(MODEL: CP 50138-2 (N.O.)/ CP 50138-1 (N.C.))

The Pressure Supervisory Switch is used to monitor the pressure within the Clean Agent cylinder. If a cylinder has leaking, and the pressure drops to below 291±10 psig, the switch contacts will be activated, providing a signal to the Release Control Panel to indicate lost of pressure and/or leakages. The pressure supervisory switch is wired into a supervised circuit to give a trouble signal upon activation. 

One version of the switch is normally closed (N.C.) (Part Number: CP 50138-1) and the other version is normally open (N.O.) (Part Number: CP 50138-2). The Pressure Supervisory Switch is referenced in the pressure condition.