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DDS-Series Differential Pressure Switch

Brand: Ashcroft Inc
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The DDS-Series Differential Pressure Switch is designed to sense low differential pressures between high pressure sources.

The high pressure seals are opposed stainless steel bellows assemblies, while the differential pressure is sensed by a diaphragm clamped between these bellows assemblies.

The diaphragm has a large area to accurately sense low differential pressure, and during an over-pressure the diaphragm is fully supported.

The design is symmetric such that both the high or low pressure sides of the element can withstand the maximum pressure with the opposite side at atmospheric pressure.

The rugged cast aluminum housing incorporates a "frictionless" switching mechanism, and can be specified as watertight or explosion proof.

The housing is large enough to accommodate up to one full size SPDT or one DPDT electric switches.

The standard differential pressure sensing element is constructed of a strong aluminum alloy using a Buna N elastomer diaphragm. Other diaphragm and wetted area materials are available.
Features
  • Rugged enclosure
  • High static pressure capability up to 1500 psi
  • Field-adjustable setpoint; fixed deadband
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The DDS-Series Differential Pressure Switch is designed to sense low differential pressures between high pressure sources.

The high pressure seals are opposed stainless steel bellows assemblies, while the differential pressure is sensed by a diaphragm clamped between these bellows assemblies.

The diaphragm has a large area to accurately sense low differential pressure, and during an over-pressure the diaphragm is fully supported.

The design is symmetric such that both the high or low pressure sides of the element can withstand the maximum pressure with the opposite side at atmospheric pressure.

The rugged cast aluminum housing incorporates a "frictionless" switching mechanism, and can be specified as watertight or explosion proof.

The housing is large enough to accommodate up to one full size SPDT or one DPDT electric switches.

The standard differential pressure sensing element is constructed of a strong aluminum alloy using a Buna N elastomer diaphragm. Other diaphragm and wetted area materials are available.
Features
  • Rugged enclosure
  • High static pressure capability up to 1500 psi
  • Field-adjustable setpoint; fixed deadband
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Specifications

Brand

Sensitivity

  • 1 % of Range

Name Plate, Tag Material

  • Stainless Steel

Environmental Protection

  • Explosion-proof
  • IP52
  • IP66
  • NEMA 12
  • NEMA 4X
  • Watertight

Materials of Construction

  • Port: Aluminum
  • Port: Stainless Steel

Enclosure, Body Material

  • 316 Stainless Steel
  • Cast Aluminum

Switch Type

  • DPDT
  • Hermetically Sealed
  • Micro Switch
  • SPDT

Set Point - Increasing

  • Inches WC: 0 to 150

Ambient Temperature Range

  • -29° to 82° C (-20° to 180° F)

Approvals & Certifications

  • UL
  • ISO 9001

Electrical Rating

  • Contact: 15 A at 125 Vac
  • Contact: 15 A at 250 Vac
  • Contact: 15 A at 480 Vac

Thermal Drift

  • < 1 % of Range (100,000 Operations)

Electrical Connectors

  • 3/4” NPT Female

Adjustment Type

  • Field Adjustable
  • Screw Typical
  • Set Point Adjustment

Diaphragm Material

  • Buna-N
  • Teflon
  • Viton

Set Point - Decreasing

  • Inches WC: 0 to 150

Seat / Seal Material

  • Seal: Buna-N
  • Seal: Teflon
  • Seal: Viton

NPT Connection

  • 1/4” NPT Female

Static Pressure

  • psi: 50 to 1,500 (kPa: 344.7 to 10,340, bar: 3.4 to 103.4)
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Applications

  • Filter Monitoring & Control
  • Pressure Level Sensing
  • Boilers
  • Pipelines
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