Pressure Switch

The SD-PS Series Pressure Switches shall be installed on the sprinkler system with connection as shown on the drawings and/or as specified herein. Pressure switches shall be of the bellows-activated type. Switches shall have a maximum service pressure rating of 300 psi and shall be factory adjusted to operate at a pressure of 4 - 8 psi.

There shall be one (1) or two (2) SPDT contacts rated at 10.0 Amp @ 125/250 VAC and 2.5 Amp @ 30 VDC. The contractor shall furnish and install, where indicated on the plans, pressure switches according to appropriate NFPA standards. Switches shall be provided with a ½˝ NPT male pressure connection to be connected to the alarm check valve of a “wet” sprinkler system, into the intermediate chamber of a “dry” system, or to a pre-action or deluge valve.

They shall be activated by any flow of water equal to or in excess of the discharge from one sprinkler head. Switches shall provide 1 knockout type and 1 open hole for ½˝ conduit fitting attachment and a ground screw pro- vision for electrical grounding.

The switch enclosure shall be weatherproof. The cover shall incorporate tamper- resistant screws. The unit shall be listed by Underwriters Laboratories, Inc. and approved by Factory Mutual.

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  • Sensitivity adjustment wheel, no special tools required.
  • Reinforced diaphragm resists pressure spikes.
  • Two conduit entrances.
  • Both one- and two-switch models available.

Maximum Operating Pressure

 300 psi





Maximum Adjustment Pressure Range

•  SD-PS1001/SD-PS1002 : 4 - 8 psi

•  SD-PS4001 : Operates at decreasing pressure at 30 psi

•  SD-PS4002 : Operates at increasing pressure at 50 psi and decreasing pressure at 30 psi.

•  SD-PS12001 : Operates at decreasing pressure at 110 psi

•  SD-PS12004 : Operates at increasing pressure at 130 psi and decreasing pressure at 30 psi



Approximate Differential

•  SD-PS1001/SD-PS1002: 3 psi

throughout range

•  SD-PS4001/SD-PS4002 : 3 psi @

10 psi & 6 psi @ 100 psi

•  SD-PS12001/SD-PS12004 : 3 psi @

10 psi & 9 psi @ 200 psi

Pressure Connection

½˝ NPT male glass reinforced nylon

Contact Rating

10 A @125/250 VAC 2.5 A @ 30VDC

Temperature Range

-40°F to 140°F (-40°C to 60°C)



Service Use

•  Automatic Sprinkler: NFPA 13

•  One or Two Family Dwelling: NFPA 13D

•  Occupancies up to 4 Stories: NFPA 13R

•  Code: NFPA 72

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