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Instantly add the Series 1900 Compact Low Differential Pressure Switch and 50,000+ more product series to your store or catalog  
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Dwyer Pressure Switch, Series 1900

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

1 - 6 of 6 Part Numbers
1910-0
1910-0
DWYER Differential Pressure Switch, Range 0.15-0.5" W.C., Approximate Deadband @ Min. Set Point 0.10, Approximate Deadband @ Max. Set Point 0.10.
  • Base Model - Compact Low Differential Pressure Switch with Conduit (Model Number 1910)
  • Pressure Range - Inches of WC: 0.15 to 0.55
  • Tag - None
  • O-Ring - Standard Material
  • Switch Type - Standard
  • Options - None
  • Enclosure Material - 16 ga Steel
  • Electrical Contacts - Standard
  • Conduit - Standard
  • Manual Reset - None
  • Mounting - Diaphragm in Vertical Position
  • Adjustment Type - Field Adjustable
  • Drain / Vent - No Drain/Vent
1910-00
1910-00
DWYER Differential Pressure Switch, Range 0.07-0.15" W.C., Approximate Deadband @ Min. Set Point 0.04, Approximate Deadband @ Max. Set Point 0.04.
  • Base Model - Compact Low Differential Pressure Switch with Conduit (Model Number 1910)
  • Pressure Range - Inches of WC: 0.07 to 0.15
  • Tag - None
  • O-Ring - Standard Material
  • Switch Type - Standard
  • Options - None
  • Enclosure Material - 16 ga Steel
  • Electrical Contacts - Standard
  • Conduit - Standard
  • Manual Reset - None
  • Mounting - Diaphragm in Vertical Position
  • Adjustment Type - Field Adjustable
  • Drain / Vent - No Drain/Vent
1910-20
1910-20
DWYER Differential Pressure Switch, Range 4.0-20.0" W.C., Approximate Deadband @ Min. Set Point 0.40, Approximate Deadband @ Max. Set Point 0.50.
  • Base Model - Compact Low Differential Pressure Switch with Conduit (Model Number 1910)
  • Pressure Range - Inches of WC: 4.0 to 22.0
  • Tag - None
  • O-Ring - Standard Material
  • Switch Type - Standard
  • Options - None
  • Enclosure Material - 16 ga Steel
  • Electrical Contacts - Standard
  • Conduit - Standard
  • Manual Reset - None
  • Mounting - Diaphragm in Vertical Position
  • Adjustment Type - Field Adjustable
  • Drain / Vent - No Drain/Vent
3654
3654
DWYER Differential Pressure Switch, Range 0.40-1.6" W.C., Approximate Deadband @ Min. Set Point 0.15, Approximate Deadband @ Max. Set Point 0.16.
3774
3774
DWYER Differential Pressure Switch, Range 1.40-5.5" W.C., Approximate Deadband @ Min. Set Point 0.30, Approximate Deadband @ Max. Set Point 0.30.
3927
3927
DWYER Differential Pressure Switch, Range 3.0-11.75" W.C., Approximate Deadband @ Min. Set Point 0.40, Approximate Deadband @ Max. Set Point 0.40.
1 - 6 of 6 Part Numbers

View_Details

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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