The Potter PS120 Series Supervisory Pressure Actuated Switches are designed primarily to detect an increase and/or decrease from normal system pressure in automatic fire sprinkler systems. Typical applications are: Wet pipe systems with excess pressure, pressure tanks, air supplies, water supplies, and monitoring pressure regulators in standpipes. The PS120 switch is factory set for 120 psi (8,3 bar) normal system pressure. The switch marked with the word LOW is set to operate at a pressure decrease of 10 psi (0,7 bar) at 110 psi (7,6 bar). The switch marked with the word HIGH is set to operate at a pressure increase of 10 psi (0,7 bar) at 130 psi (9 bar). See section heading Adjustments and Testing if other than factory set point is required.

• Connect the PS120 to the system side of any shutoff or check valve.
• Apply Teflon tape to the threaded male connection on the device. (Do not use pipe dope)
• Device should be mounted in the upright position. (Threaded connection down)
• Tighten the device using a wrench on the flats on the device.