DWYER Series SA1100 Diaphragm Operated Pressure Switches

RM 0.00



Series SA1100 Diaphragm Operated Pressure Switches

Visible Setpoint, Adjustable Deadband, Hermetically Sealed Snap Switch, Weatherproof and Explosion-proof

The 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. New design also provides burst pressure protection to 3000 psi (206 bar). 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 being used to control liquid level in a tank would be a typical situation where this feature would be important. Both setpoint and deadband adjustments are protected, yet clearly visible behind a clear polycarbonate window and are 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 drain to meet NEMA 3R IP54.

Product Applications

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



  • 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




  • Wetted Materials: See pressure chamber and diaphragm material in model 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 2813 II 2 G Ex d IIC T6 Gb Process Temperature 75°C. Weatherproof UL Rated Type 4. Meets NEMA 4X (IP66). EC-Type Certificate KEMA 04ATEX2186 X ATEX Standards: EN 60079-0:2009; EN 60079-1:2007 IECEx Certified for Ex d IIC T6 Gb IEC Standards: IEC 60079-0:2007; IEC 60079-1:2007 IECEx Certificate of Conformity: IECEx DEK 11.0095X
  • Switch Type: SPDT or DPDT snap switch.
  • Electrical Rating: See model 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.
  • *Options that do not have ATEX.


Models & Ordering


Model Description
SA1111E-A4-K1 Diaphragm operated pressure switch, 1/4″ NPT(F) Process Connection, Buna-N Diaphragm and O-ring.


316 SS

Model Description
SA1111E-S5-K2 Diaphragm operated pressure switch, 1/2″ NPT(F) Process Connection, Fluorocarbon Diaphragm and 0-ring.





Additional information


SA1111E-A4-K1, SA1111E-S5-K2