Dwyer Pressure Switch, Series 1900
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Series 1900 Compact Low Differential Pressure Switch

Brand: Dwyer Instruments, LLC
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Our most popular Series 1900 Compact Low Differential Pressure Switch combines advanced design and precision construction to make these switches able to perform many of the tasks of larger, costlier units. 

Designed for air conditioning service, they also serve many fluidics, refrigeration, oven and dryer applications. For air and non-combustible compatible gases, Series 1900 switches have set points from 0.07 to 20" w.c. (1.8 to 508 mm).

Set point adjustment is easy with range screw located inside conduit enclosure. Internal location helps prevent tampering. UL, CE and CSA listed, and FM approved.

CAUTION: FOR USE ONLY WITH AIR OR COMPATIBLE GASES.
Features
  • Compact size and repeatability, provides a high-value switch for many industrial and OEM applications
  • Wide range of models from 0.07 in w.c. to 20 in w.c. can meet exacting OEM specifications for a low pressure switch
  • Range screw protected inside enclosure provides simplifies making adjustments but prevents tampering

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Specifications

Brand

Adjustment Type

  • Factory Set (Pre-Set)
  • Field Adjustable

Approvals & Certifications

  • CE
  • CSA
  • FM
  • UL

Deadband, Approximate

  • Inches WC: 0.04 to 0.50

Diaphragm Material

  • Buna-N
  • Fluoroelastomer

Electrical Connectors

  • 3 Screw Typical
  • Common

Electrical Contacts

  • Gold
  • Normally Closed
  • Normally Open
  • Silver

Electrical Rating

  • 15 A at 120-480 Vac, 60 Hz Resistive 1/8 hp at 125 Vac, 1/4 hp at 250 Vac, 60 Hz Derate to 10 A for Operation at High Cycle Rates

Enclosure, Body Material

  • 16 Ga. Steel Enclosure - Weatherproof
  • Cast Iron Base with Aluminum Cover - Explosion-proof

Environmental Protection

  • IP66
  • IP54
  • NEMA 3
  • NEMA 4
  • NEMA 7
  • NEMA 9

NPT Connection

  • 1/8” NPT Female

O-Ring Material

  • Buna-N
  • Fluoroelastomer

Operating Temperature

  • -34° to 82° C (-30° to 180° F)

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

  • -34° to 82.2° C (-30° to 180° F) (32° F for Non-Dry Air)

  • Air Conditioning Refrigeration Coil Icing Detection; Defrost Cycle Initiation
  • Clogged Filter Detection
  • Variable Air Volume Controller

Documentation

Approvals

Catalogs

Manuals

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