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Series 1950G Explosion-Proof Differential Pressure Switch

Brand: Dwyer Instruments, LLC
Does not ship to OH, United States
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.
Features
  • 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
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.
Features
  • 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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Specifications

Brand

Adjustment Type

  • Factory Set (Pre-Set)
  • Field Adjustable

Applications

  • 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.
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Applications

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