Series 1950G Explosion-Proof Differential Pressure Switch

Brand: Dwyer Instruments, LLC

Series 1950G Explosion-Proof Switch combines the best features of the popular Dwyer® Series 1950 Pressure Switch with the benefit of natural gas compatibility.

Units are rain-tight for outdoor installations, and are UL listed for use in Class I, Groups A, B, C, & D; Class II, Groups E, F, & G and Class III atmospheres, Directive 2014/34/EU (ATEX) Compliant for CE ATEX II 2G Exd IIB+H2 T6, CSA & FM approved for Class I, Div. 1, Groups B, C, D; Class II, Div. 1, Groups E, F, G and Class III atmospheres IECEx Ex d IIB+H2 T6 (-40° C < Ta < 60° C).

The 1950G is very compact, about half the weight and bulk of equivalent conventional explosion-proof switches.

Easy access to the SPDT relay and power supply terminals is provided by removing the top plate of the aluminum housing.

A supply voltage of 24 VDC, 120 or 240 VAC is required. A captive screw allows the cover to swing aside while remaining attached to the unit. Adjustment to the set point of the switch can be made without disassembly of the housing.
  • Compatible with natural gas
  • External set point screw provides easy access that simplifies making adjustments without opening or disassembling enclosure
  • Easily accessible electrical connection simplifies the installation

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Adjustment Type

  • Factory Set (Pre-Set)
  • Field Adjustable


  • All-Weather Applications
  • Natural Gas
  • Process Applications

Approvals & Certifications

  • ATEX
  • CE
  • CSA
  • FM
  • IEC Ex
  • UL

Deadband, Approximate

  • bar: 0 to 0.21
  • kPa: 0.28 to 20.7
  • psi: 0.04 to 3.0

Diaphragm Material

  • Buna-N

Electrical Connectors

  • Terminal Strip - Internal

Electrical Contacts

  • Silver

Electrical Rating

  • 10 A, 120/240 Vac, 28 Vdc Resistive 50 mA, 125 Vdc

Enclosure, Body Material

  • Aluminum

Environmental Protection

  • IP54
  • NEMA 3
  • NEMA 7
  • NEMA 9

NPT Connection

  • 1/8” NPT Female

O-Ring Material

  • Buna-N

Process Connection Material

  • Aluminum

Set Point - Decreasing

  • Inches WC: 0.07 to 20

Set Point - Increasing

  • Inches WC: 0.07 to 20

Switch Type

  • SPDT

System Pressure

  • bar: 0.68
  • kPa: 68.95
  • psig: 10

Temperature Range

  • -17° to 60° C (-170° to 140° F) Note: Set Point Drift May Occur with Ambient Temperature Changes.

  • Natural Gas Applications
  • Process Applications
  • All-Weather Applications

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