The Potter PS40 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: Dry pipe systems, pre-action air/nitrogen supervision, pressure tanks, air supplies, and water supplies. The PS40 switch is factory set for 2.8 bar (40 psi) normal system pressure. The switch marked with the word LOW is set to operate at a pressure decrease of 0.7 bar (10 psi) at 2.1 bar (30 psi). The switch marked with the word HIGH is set to operate at a pressure increase of 0.7 bar (10 psi) at 3.5 bar (50 psi). See section heading Adjustments and Testing if other than factory set point is required.