Dwyer Series SA1100 Diaphragm Operated Pressure Switches

Part Number: Series SA1100 Category:

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The Dwyer Series SA1100 Diaphragm Operated Pressure Switches are weatherproof and explosion-proof in one economical enclosure. Extremely rugged construction assures excellent reliability in chemical, petroleum, and industrial plants. The new design also provides burst pressure protection to 206bar (3000 psi). The rolling diaphragm design maintains a constant effective area to minimize friction. This results in a minimum deadband as low as 5% of full-scale. Since many applications require higher deadbands, the SA1100 includes a separate adjustment of this when necessary. A pump is used to control a tank’s liquid level would be a typical situation where this feature would be valuable. Both setpoints and deadband adjustments are protected yet clearly visible behind a clear polycarbonate window and fully isolated from the electrical components for additional safety. A 7/16″ open-end wrench is the only tool required to change settings. Terminal blocks are provided for switch wiring connections, and both internal and external ground screws are included. Standard housing is weatherproof to NEMA standards 1 through 4X and 13; explosion-proof to NEMA 7, Class I, Groups B, C & D; NEMA 9, Class II, Groups E, F & G. Optional construction adds a drain to meet NEMA 3R IP54.

Product Applications

  • Chemical, petroleum, food, and drug processing industries
  • Used indoor, outdoor, or in an explosion-proof area
  • Pump control

Wetted Materials : See pressure chamber and diaphragm material in sku chart.

Temperature Limits : -30 to 180°F (-35 to 82°C) standard. ATEX compliant at Ambient Temperature -4 to 167°F (-20 to 75°C); Process Temperature -4 to 167°F (-20 to 75°C).

Pressure Limit : 1200 psig (82.6 bar).

Enclosure Rating : Weatherproof and Explosion-proof. Listed with UL and CSA for Class I, Groups B, C and D; Class II Groups E, F and G. ATEX Compliant CE 0344 Ex II 2 G EEx d IIC T6 Process Temperature 75°C. Weatherproof UL Rated Type 4. Meets NEMA 4X (IP66).

Switch Type : SPDT or DPDT snap switch.

Electrical Rating : See sku chart.

Electrical Connections : Screw terminal.

Conduit Connection : 3/4″ female NPT.

Process Connection : 1/2″ female NPT.

Mounting Orientation : Within 20° of vertical.

Set Point Adjustment : Internal 7/16″ hex nuts.

Weight : 3.5 lb (1.6 kg).

Deadband : See deadband chart.

Agency Approvals : ATEX, CE, CSA, UL.

  • Explosion-proof and weatherproof housing provides device protection for outdoor use or harsh environment operation
  • Burst pressure protection prevents device failure where high-pressure surges may damage device costing down-time and repair/replacement
  • Adjustable deadband reduces equipment cycling and potential failure
  • Visible set-point and deadband adjustments provide an easy and fast check without having to open device causing dangerous conditions to operators

Manuals: Instruction Manual (English Only)
Catalog Pages: Series SA1100 Catalog Page

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