Dwyer Series DP Double Bellows Differential Pressure Switch

Part Number: Series DP Category:

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Two opposing bellows combine maximum sensitivity and vibration resistance at a moderate cost in the Series DP Differential Pressure Switches. Both set and reset points are easily adjustable through non-interactive, externally accessible controls. Visible setpoint indicators simplify changes. SPDT snap action switch, 316 stainless steel or brass bellows, flanged steel housing. Rated pressures to 600 psig.

A wide variety of switches and circuit styles enables exactly the specific type of control function needed for any system. Mercury switches are a good choice for humid areas while snap switches are better able to resist vibration. Various operations possible include single adjustment – fixed deadband, double adjustment – adjustable deadband, manual reset (increasing or decreasing pressure) and two stage with each SPST or SPDT switch independently adjustable. Standard enclosure is NEMA-1 style. Optional weatherproof construction is for outdoor use and explosion-proof enclosure meets requirements for Class I, Groups C & D; Class II, Groups E, F & G.

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Product Applications

  • Accurate switch triggers in high pressure applications

Wetted Materials : Brass on ranges 61, 62, 63 or 316SS on ranges 62E, 64E 65E.

Temperature Limits : -10 to 180°F (-23 to 82°C).

Pressure Limit : Maximum pressure of the operating range.

Enclosure Rating : General purpose, weatherproof or explosion-proof.

Switch Type : Mercury or snap switch, see Ordering Page.

Electrical Rating : See Ordering Page.

Electrical Connection : Screw terminal.

Conduit Connection : General purpose: 1/2″ hole for conduit hub. Weatherproof: 1/2″ conduit hub. Explosion-proof: 3/4″ NPT female.

Process Connection : General purpose and weatherproof: 1/8″ NPT female.

Explosion-proof : 1/4″ NPT male.

Mounting Orientation : Vertical.

Set Point Adjustment : Thumbscrew.

Weight : General purpose: 5 lb (2.3 kg). Weatherproof: 7 lb (3 kg). Explosion-proof: 25 lb (11 kg).

Agency Approvals : CE, cULus

  • Bellows switch design provides sensitivity to pressure changes but resists vibration preventing out of range switching
  • External access to set and rest controls makes for easy adjustments
  • Visible set point indicators simplify changes

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