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DDS-Series Differential Pressure Switch
Brand: Ashcroft Inc
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
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)
- Filter Monitoring & Control
- Pressure Level Sensing
- Boilers
- Pipelines
