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Last Updates: 05/12/2020

Dwyer Series AP Diaphragm Operated Pressure Switch

Reliable and convenient, the Dwyer Series AP Diaphragm Operated Pressure Switch is a compact switch for instrument air or other low-pressure applications. Visible set point and external adjustment add convenience. Used on air, non-corrosive gas, or liquid service compatible with wetted parts. Units are available in a weather-proof and explosion-proof housing.

Product Applications

  • Low-pressure applications
  • Instrument air

Wetted Materials : Nylon reinforced Buna-N and steel. PTFE and 316 SS optional.

Temperature Limits : -30 to 150°F (-35 to 66°C).

Pressure Limit : See Catalog page.

Enclosure Rating : General purpose. Weatherproof and explosion-proof optional.

Switch Type : SPDT mercury switch or SPDT snap switch. Other switch types available.

Electrical Rating : Mercury switch: 4 A @ 120 VAC/DC, 2 A @ 240 VAC/DC. Snap switch: 15 A @ 120 VAC, 8 A @ 240 VAC, 0.5 A @ 120 VDC, 0.25 A @ 240 VDC.

Electrical Connections : Screw terminal.

Conduit Connection : 7/8″ (22.23 mm) hole for 1/2″ (12.7 mm) conduit hub.

Process Connection : 1/4″ female NPT.

Mounting Orientation : Vertical for mercury switch skus, any position for snap switch skus.

Set Point Adjustment : External screw.

Weight : General Purpose: 2 lb (0.9 kg).

Deadband : See Catalog page.

Agency Approvals : CE, CSA, FM, UL. For FM consult factory. (Mercury switch units are not CE approved.)

  • Explosion-proof and weatherproof housing provides device protection for outdoor use or harsh environment operation
  • External switch set point adjustment reduces set-up time

Manuals: Instruction Manual
Catalog Pages: Series AP Catalog Page

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