Series 1950 Explosion-Proof Differential Pressure Switch

Brand: Dwyer Instruments, LLC

Series 1950 Explosion-Proof Differential Pressure Switch combines the best features of the popular Dwyer® Series 1900 Pressure Switch with an integral explosion-proof and weatherproof housing, making it an exceptional value for either application.

It is CE, UL and CSA listed, FM approved for use in Class I, Div 1, Groups C and D, Class II Groups E, F, and G and Class III hazardous atmospheres (NEMA 7 & 9), Raintight NEMA 3 (IP54).

Weatherproof features include a drain plug and O-ring seal in cover. Electrical connections are easily made by removing front cover. For convenience the set point adjustment screw is located on the outside of the housing.

Twelve models offer set points from 0.03 to 20 in w.c. (0.0075 to 5 kPa) and from 0.5 to 50 psi (0.035 to 3.5 bar).

The unit is very light and compact - about half the weight and bulk of other explosion-proof or weather-proof switches with separate enclosures.

CAUTION: For use only with air or compatible gases. Applications with hazardous atmospheres and a single positive pressure may require special venting.
Features
  • Explosion-proof and weatherproof housing provides device protection for outdoor use or harsh environment operation
  • External set point screw provides easy access that simplifies making adjustments without opening or disassembling enclosure
  • Easily accessible electrical connection simplifies the installation

Specifications

Adjustment Type

  • Factory Set (Pre-Set)
  • Field Adjustable

Approvals & Certifications

  • CE
  • CSA
  • FM
  • UL

Diaphragm Material

  • Buna-N
  • Fluoroelastomer
  • Fluorosilicone
  • Neoprene
  • Silicone

Electrical Connectors

  • 3 Screw Typical
  • Common

Electrical Contacts

  • 10 G Mica Silver Contact
  • 10 G Phenolic Gold Contacts
  • 10 G Phenolic Silver Contact
  • Normally Closed
  • Normally Open

Electrical Rating

  • 15 A At, 125, 250, 480 Vac, 60 Hz Resistive 1/8 hp at 125 Vac, 1/4 hp at 250 Vac, 60 Hz

Enclosure, Body Material

  • Aluminum

Environmental Protection

  • IP54
  • NEMA 3
  • NEMA 7
  • NEMA 9

NPT Connection

  • 1/8” NPT Female

O-Ring Material

  • Buna-N
  • Fluor Elastomer
  • Fluorosilicone
  • Neoprene
  • Silicone Rubber
  • Viton

Proof Pressure

  • bar: 0.690
  • kPa: 68.95
  • psid: 10

Set Point - Decreasing

  • bar: 0.034 to 3.447
  • Inches WC: 0.03 to 20
  • kPa: 3.447 to 344.7
  • psid: 0.5 to 50

Set Point - Increasing

  • bar: 0.034 to 3.447
  • Inches WC: 0.03 to 20
  • kPa: 3.447 to 344.7
  • psid: 0.5 to 50

Switch Type

  • SPDT

System Pressure

  • bar: 2.413
  • Inches WC: 45
  • kPa: 241.3
  • psid: 35

Temperature Range

  • -40° to 60° C (-40° to 140° F), -17.8° to 60° C (0° to 140° F) for 1950P-8, 15, 25 & 50. -34.4° to 54.4° C (-30° to 130° F) for 1950-02

  • HVAC Applications
  • Process Applications
  • All-Weather Applications
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