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Instantly add the Series H3 Explosion-Proof Differential Pressure Switch and 50,000+ more product series to your store or catalog  
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Dwyer Explosion-proof Differential Pressure Switch, Series H3

Series H3 Explosion-Proof Differential Pressure Switch

Brand: Dwyer Instruments, LLC
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Explosion-proof Series H3 Explosion-Proof Differential Pressure Switch, heavy duty, industrial unit has a unique new design which provides sensitivity to differential pressures as low as 10 inches of water (254 mm w.c.), yet handles total pressure of 1500 psi (103 bar). 

Unlike common differential pressure switches that use a piston-type motion transfer, the Series H3 utilizes a rotary motion transfer shaft that prevents a change in total pressure from causing a setpoint shift.

Unit yields deadbands approximately 5% of range, with zero setpoint shift due to variation in working pressures. Friction is minimized and repeatability increased by allowing range spring to act directly on diaphragm plate. 

Rolling diaphragm design maintains constant effective area to further reduce friction. Diaphragm is allowed to "seat", allowing application of full rated pressure, up to 1500 psi (103 bar), on either high or low pressure port, without damage. Special over-travel feature prevents overtightening of range adjust screw.

Choose optional 316SS chamber for water and water-based fluids or harsher applications.
Features
  • Rotary motion design prevents set point shifts
  • Explosion-proof housing for use in applications where protection of process and personnel is needed
  • Option for use with water and water-based solution makes this a versatile switch

1 - 12 of 1,536 Part Numbers
H3A-1DC
H3A-1DC
  • Process Connection Material - Aluminum
  • Pressure Range - Inches WC: 10 to 180
  • Output - DPDT Snap Switch, Rated 5 A, 120/250 Vac, 30 Vdc
  • Electrical Connection - ATEX Approved Internal Terminal Block
  • Electrical Contacts - Standard
  • Adjustment Type - Field Adjustable
  • Tag - No Tag
  • Enclosure - Standard - NEMA 4X IP56
  • Diaphragm Material - Nitrile
H3A-1DC-DRAIN
H3A-1DC-DRAIN
  • Process Connection Material - Aluminum
  • Pressure Range - Inches WC: 10 to 180
  • Output - DPDT Snap Switch, Rated 5 A, 120/250 Vac, 30 Vdc
  • Electrical Connection - ATEX Approved Internal Terminal Block
  • Electrical Contacts - Standard
  • Adjustment Type - Field Adjustable
  • Tag - No Tag
  • Enclosure - with Drain - NEMA 3
  • Diaphragm Material - Nitrile
H3A-1DC-DRAIN-VIT
H3A-1DC-DRAIN-VIT
  • Process Connection Material - Aluminum
  • Pressure Range - Inches WC: 10 to 180
  • Output - DPDT Snap Switch, Rated 5 A, 120/250 Vac, 30 Vdc
  • Electrical Connection - ATEX Approved Internal Terminal Block
  • Electrical Contacts - Standard
  • Adjustment Type - Field Adjustable
  • Tag - No Tag
  • Enclosure - with Drain - NEMA 3
  • Diaphragm Material - Fluoroelastomer
H3A-1DC-MV
H3A-1DC-MV
  • Process Connection Material - Aluminum
  • Pressure Range - Inches WC: 10 to 180
  • Output - DPDT Snap Switch, Rated 5 A, 120/250 Vac, 30 Vdc
  • Electrical Connection - ATEX Approved Internal Terminal Block
  • Electrical Contacts - Gold Contacts
  • Adjustment Type - Field Adjustable
  • Tag - No Tag
  • Enclosure - Standard - NEMA 4X IP56
  • Diaphragm Material - Nitrile
H3A-1DC-MV-DRAIN
H3A-1DC-MV-DRAIN
  • Process Connection Material - Aluminum
  • Pressure Range - Inches WC: 10 to 180
  • Output - DPDT Snap Switch, Rated 5 A, 120/250 Vac, 30 Vdc
  • Electrical Connection - ATEX Approved Internal Terminal Block
  • Electrical Contacts - Gold Contacts
  • Adjustment Type - Field Adjustable
  • Tag - No Tag
  • Enclosure - with Drain - NEMA 3
  • Diaphragm Material - Nitrile
H3A-1DC-MV-DRAIN-VIT
H3A-1DC-MV-DRAIN-VIT
  • Process Connection Material - Aluminum
  • Pressure Range - Inches WC: 10 to 180
  • Output - DPDT Snap Switch, Rated 5 A, 120/250 Vac, 30 Vdc
  • Electrical Connection - ATEX Approved Internal Terminal Block
  • Electrical Contacts - Gold Contacts
  • Adjustment Type - Field Adjustable
  • Tag - No Tag
  • Enclosure - with Drain - NEMA 3
  • Diaphragm Material - Fluoroelastomer
H3A-1DC-MV-PRESET
H3A-1DC-MV-PRESET
  • Process Connection Material - Aluminum
  • Pressure Range - Inches WC: 10 to 180
  • Output - DPDT Snap Switch, Rated 5 A, 120/250 Vac, 30 Vdc
  • Electrical Connection - ATEX Approved Internal Terminal Block
  • Electrical Contacts - Gold Contacts
  • Adjustment Type - Preset (Not Field Adjustable)
  • Tag - No Tag
  • Enclosure - Standard - NEMA 4X IP56
  • Diaphragm Material - Nitrile
H3A-1DC-MV-PRESET-DRAIN
H3A-1DC-MV-PRESET-DRAIN
  • Process Connection Material - Aluminum
  • Pressure Range - Inches WC: 10 to 180
  • Output - DPDT Snap Switch, Rated 5 A, 120/250 Vac, 30 Vdc
  • Electrical Connection - ATEX Approved Internal Terminal Block
  • Electrical Contacts - Gold Contacts
  • Adjustment Type - Preset (Not Field Adjustable)
  • Tag - No Tag
  • Enclosure - with Drain - NEMA 3
  • Diaphragm Material - Nitrile
H3A-1DC-MV-PRESET-DRAIN-VIT
H3A-1DC-MV-PRESET-DRAIN-VIT
  • Process Connection Material - Aluminum
  • Pressure Range - Inches WC: 10 to 180
  • Output - DPDT Snap Switch, Rated 5 A, 120/250 Vac, 30 Vdc
  • Electrical Connection - ATEX Approved Internal Terminal Block
  • Electrical Contacts - Gold Contacts
  • Adjustment Type - Preset (Not Field Adjustable)
  • Tag - No Tag
  • Enclosure - with Drain - NEMA 3
  • Diaphragm Material - Fluoroelastomer
H3A-1DC-MV-PRESET-ST
H3A-1DC-MV-PRESET-ST
  • Process Connection Material - Aluminum
  • Pressure Range - Inches WC: 10 to 180
  • Output - DPDT Snap Switch, Rated 5 A, 120/250 Vac, 30 Vdc
  • Electrical Connection - ATEX Approved Internal Terminal Block
  • Electrical Contacts - Gold Contacts
  • Adjustment Type - Preset (Not Field Adjustable)
  • Tag - Stainless Steel
  • Enclosure - Standard - NEMA 4X IP56
  • Diaphragm Material - Nitrile
H3A-1DC-MV-PRESET-ST-DRAIN
H3A-1DC-MV-PRESET-ST-DRAIN
  • Process Connection Material - Aluminum
  • Pressure Range - Inches WC: 10 to 180
  • Output - DPDT Snap Switch, Rated 5 A, 120/250 Vac, 30 Vdc
  • Electrical Connection - ATEX Approved Internal Terminal Block
  • Electrical Contacts - Gold Contacts
  • Adjustment Type - Preset (Not Field Adjustable)
  • Tag - Stainless Steel
  • Enclosure - with Drain - NEMA 3
  • Diaphragm Material - Nitrile
H3A-1DC-MV-PRESET-ST-DRAIN-VIT
H3A-1DC-MV-PRESET-ST-DRAIN-VIT
  • Process Connection Material - Aluminum
  • Pressure Range - Inches WC: 10 to 180
  • Output - DPDT Snap Switch, Rated 5 A, 120/250 Vac, 30 Vdc
  • Electrical Connection - ATEX Approved Internal Terminal Block
  • Electrical Contacts - Gold Contacts
  • Adjustment Type - Preset (Not Field Adjustable)
  • Tag - Stainless Steel
  • Enclosure - with Drain - NEMA 3
  • Diaphragm Material - Fluoroelastomer
1 - 12 of 1,536 Part Numbers

View_Details

Specifications

Brand

Adjustment Type

  • Factory Set (Pre-Set)
  • Field Adjustable

Approvals & Certifications

  • ATEX
  • CE
  • CSA
  • UL

Deadband, Approximate

  • Approximately 5 % of Range

Diaphragm Material

  • Fluoroelastomer
  • Nitrile

Electrical Connectors

  • 18 AWG x 18” Leadwires
  • 3/4” NPT Female
  • ATEX Approved Internal Terminal Block
  • UL, CSA Approved Internal Terminal Block

Electrical Contacts

  • Gold
  • Silver

Electrical Rating

  • 5 A at 125/250 Vac, 30 Vdc

Enclosure, Body Material

  • Aluminum

Environmental Protection

  • IP56
  • IP66
  • NEMA 3, 4X / IP56, 66
  • NEMA 4X

NPT Connection

  • 1/8” NPT Female

O-Ring Material

  • Nitrile
  • Viton

Operating Temperature

  • -20° to 104° C (-4° to 220° F)

Process Connection Material

  • 316 Stainless Steel
  • Aluminum

Process Temperature

  • -20° to 90° C (-4° to 220° F)

Set Point - Decreasing

  • bar: 0.03 to 13.8
  • Inches WC: 10 to 80
  • kPa: 3.447 to 1,379
  • psid: 0.5 to 200

Set Point - Increasing

  • bar: 0.03 to 13.8
  • Inches WC: 10 to 180
  • kPa: 3.447 to 1,379
  • psid: 0.5 to 200

Switch Type

  • DPDT
  • SPDT

System Pressure

  • bar: 103.4
  • kPa: 10,342
  • psi: 1,500

  • Water Flow Proving with an Orifice Plate.
  • Differential Pressure Across Chiller.
  • Liquid Filter Status.
  • Perfect for Monitoring Differential Water Pressure on Filters, Chiller Coils, and Flow Elements.

Documentation

Approvals

Catalogs

Manuals

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