Dwyer Bourdon Tube Pressure Switch, Series DA/DS
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Series DA/DS Bourdon Tube Pressure Switch

Brand: Dwyer Instruments, LLC
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Customers tell us that the Dwyer Series DA/DS Bourdon Tube Pressure Switches are the best pressure switches made.

The Mercoid DA/DS Series is one of the world's broadest lines of pressure switches.

The DA/DS Series has extremely high sensitivity and great repeatability.

The DA Models are equipped with two external adjustments, one for setting high pressure operating point, the other for setting low pressure operating point. Deadband, the difference between high and low setpoints, is adjustable over the full-scale.

The DS Models are equipped with a single external adjustment for setting operating point only.

For mercury-free switches, choose between the snap action switch or hermetically sealed snap action switch. Hermetically sealed mercury switch also available.
Features
  • Visible calibrated dial provides an easy and fast check without having to open device causing dangerous conditions to operators
  • On/off indication (except hermetically sealed snap switch models) gives operator clear indication of state of switched equipment that could be located in another location
  • Adjustable or fixed deadband supports control applications by reducing equipment wear-out by unnecessary recycling
  • External switch set-point adjustment reduces set-up time
  • Pressure ranges of full vacuum to 8000 psig gives application designers the ability to specify standard equipment, simplifying install and training, and reducing servicing costs
  • UL listed, CSA approved, many models FM approved to support rigorous process applications and regulations
  • General purpose, weatherproof or explosion-proof enclosures for a variety of indoor or outdoor environments meeting the needs of multiple applications and uses

Displaying price & availability for United States in CAD Change Location

4,609 models matching criteria
DSWF-7021-153-13S
  • Deadband - Fixed
  • Enclosure - Weatherproof Enclosure
  • Agency Approvals - FM Approved
  • Switch Type - Snap Action Switch - 10A, 120/240 Vac
  • Bourdon Tube Material - 403 Stainless Steel
  • Output - SPDT
  • Pressure Range - psig: 300 to 2,500 (bar: 20.68 to 172.4, kPa: 2,068 to 17,237)
100+ In Stock
$140.00CAD
Does not ship to United States
DSWF-7241-153-13E
  • Deadband - Fixed
  • Enclosure - Weatherproof Enclosure
  • Agency Approvals - FM Approved
  • Switch Type - Snap Action Switch - 15A, 120/240 AC
  • Bourdon Tube Material - 316 Stainless Steel
  • Output - SPDT
  • Pressure Range - psig: 200 to 2,500 (bar: 13.79 to 172.4, kPa: 1,379 to 17,237)
100+ In Stock
$162.00CAD
Does not ship to United States
DSF-31-3-7
  • Deadband - Fixed
  • Enclosure - General-Purpose
  • Agency Approvals - FM Approved
  • Switch Type - Mercury Switch
  • Bourdon Tube Material - Brass
  • Output - SPST Mercury Switch - Closes on Pressure Increase
  • Pressure Range - psig: 5 to 150 (bar: 0.345 to 10.34, kPa: 34.47 to 1,034)
100+ In Stock
$435.00CAD
Does not ship to United States
DAHF-7021-3-9AS
  • Deadband - Adjustable
  • Enclosure - Explosion-Proof
  • Agency Approvals - FM Approved
  • Switch Type - Snap Action Switch - 10A, 120/240 Vac
  • Bourdon Tube Material - 403 Stainless Steel
  • Output - SPST Mercury Switch - Closes on Pressure Increase
  • Pressure Range - psig: 40 to 350 (bar: 2.758 to 24.13, kPa: 275.8 to 2,413)
100+ In Stock
$451.00CAD
Does not ship to United States
DAW-7031-3-8
  • Deadband - Adjustable
  • Enclosure - Weatherproof Enclosure
  • Agency Approvals - No Additional Approvals
  • Switch Type - Snap Action Switch - 10A, 120/240 Vac
  • Bourdon Tube Material - Brass
  • Output - SPST Mercury Switch - Closes on Pressure Increase
  • Pressure Range - psig: 10 to 200 (bar: 0.689 to 13.79, kPa: 68.95 to 1,379)
100+ In Stock
$514.00CAD
Does not ship to United States
DAWF-7041-153-22E
  • Deadband - Adjustable
  • Enclosure - Weatherproof Enclosure
  • Agency Approvals - FM Approved
  • Switch Type - Snap Action Switch - 10A, 120/240 Vac
  • Bourdon Tube Material - 316 Stainless Steel
  • Output - SPDT
  • Pressure Range - psig: 75 to 800 (bar: 5.171 to 55.16, kPa: 517.1 to 5,516)
100+ In Stock
$521.00CAD
Does not ship to United States
DSHF-7231-153-2
  • Deadband - Fixed
  • Enclosure - Explosion-Proof
  • Agency Approvals - FM Approved
  • Switch Type - Snap Action Switch - 15A, 120/240 AC
  • Bourdon Tube Material - Brass
  • Output - SPDT
  • Pressure Range - -30 Inches Hg to 0 psig
100+ In Stock
$615.00CAD
Does not ship to United States
DAW-7031-153-3
  • Deadband - Adjustable
  • Enclosure - Weatherproof Enclosure
  • Agency Approvals - No Additional Approvals
  • Switch Type - Snap Action Switch - 10A, 120/240 Vac
  • Bourdon Tube Material - Brass
  • Output - SPDT
  • Pressure Range - -10 Inches Hg to 12 psig
100+ In Stock
$635.00CAD
Does not ship to United States
DAWF-7021-3-9AS
  • Deadband - Adjustable
  • Enclosure - Weatherproof Enclosure
  • Agency Approvals - FM Approved
  • Switch Type - Snap Action Switch - 10A, 120/240 Vac
  • Bourdon Tube Material - 403 Stainless Steel
  • Output - SPST Mercury Switch - Closes on Pressure Increase
  • Pressure Range - psig: 40 to 350 (bar: 2.758 to 24.13, kPa: 275.8 to 2,413)
100+ In Stock
$672.00CAD
Does not ship to United States
DAHF-7031-153-27
  • Deadband - Adjustable
  • Enclosure - Explosion-Proof
  • Agency Approvals - FM Approved
  • Switch Type - Snap Action Switch - 10A, 120/240 Vac
  • Bourdon Tube Material - Brass
  • Output - SPDT
  • Pressure Range - -25" Hg to 50 psig
100+ In Stock
$714.00CAD
Does not ship to United States
DSW-31-2-2
  • Deadband - Fixed
  • Enclosure - Weatherproof Enclosure
  • Agency Approvals - No Additional Approvals
  • Switch Type - Mercury Switch
  • Bourdon Tube Material - Brass
  • Output - SPST Mercury Switch - Opens on Pressure Increase
  • Pressure Range - -30 Inches Hg to 0 psig
100+ In Stock
$741.00CAD
Does not ship to United States
DAW-7331-3-7
  • Deadband - Adjustable
  • Enclosure - Weatherproof Enclosure
  • Agency Approvals - No Additional Approvals
  • Switch Type - Snap Action Switch - 5A, 120/240 Vac, 5A Res. @ 30 Vdc
  • Bourdon Tube Material - Brass
  • Output - SPST Mercury Switch - Closes on Pressure Increase
  • Pressure Range - psig: 5 to 150 (bar: 0.345 to 10.34, kPa: 34.47 to 1,034)
100+ In Stock
$768.00CAD
Does not ship to United States
DSF-7321-153-15S
  • Deadband - Fixed
  • Enclosure - General-Purpose
  • Agency Approvals - FM Approved
  • Switch Type - Snap Action Switch - 5A, 120/240 Vac, 5A Res. @ 30 Vdc
  • Bourdon Tube Material - 403 Stainless Steel
  • Output - SPDT
  • Pressure Range - psig: 500 to 5,000 (bar: 34.47 to 344.7, kPa: 3,447 to 34, 474)
100+ In Stock
$786.00CAD
Does not ship to United States
DAH-7231-2-8
  • Deadband - Adjustable
  • Enclosure - Explosion-Proof
  • Agency Approvals - No Additional Approvals
  • Switch Type - Snap Action Switch - 15A, 120/240 AC
  • Bourdon Tube Material - Brass
  • Output - SPST Mercury Switch - Opens on Pressure Increase
  • Pressure Range - psig: 10 to 200 (bar: 0.689 to 13.79, kPa: 68.95 to 1,379)
100+ In Stock
$938.00CAD
Does not ship to United States
DSWF-7021-2-5S
  • Deadband - Fixed
  • Enclosure - Weatherproof Enclosure
  • Agency Approvals - FM Approved
  • Switch Type - Snap Action Switch - 10A, 120/240 Vac
  • Bourdon Tube Material - 403 Stainless Steel
  • Output - SPST Mercury Switch - Opens on Pressure Increase
  • Pressure Range - psig: 2 to 60 (bar: 0.138 to 4.137, kPa: 13.79 to 413.7)
100+ In Stock
$984.00CAD
Does not ship to United States
DSF-7231-153-27
  • Deadband - Fixed
  • Enclosure - General-Purpose
  • Agency Approvals - FM Approved
  • Switch Type - Snap Action Switch - 15A, 120/240 AC
  • Bourdon Tube Material - Brass
  • Output - SPDT
  • Pressure Range - -25" Hg to 50 psig
100+ In Stock
$1,177.00CAD
Does not ship to United States
DAF-7341-153-13E
  • Deadband - Adjustable
  • Enclosure - General-Purpose
  • Agency Approvals - FM Approved
  • Switch Type - Snap Action Switch - 5A, 120/240 Vac, 5A Res. @ 30 Vdc
  • Bourdon Tube Material - 316 Stainless Steel
  • Output - SPDT
  • Pressure Range - psig: 200 to 2,500 (bar: 13.79 to 172.4, kPa: 1,379 to 17,237)
100+ In Stock
$1,255.00CAD
Does not ship to United States
DSF-7321-2-9AS
  • Deadband - Fixed
  • Enclosure - General-Purpose
  • Agency Approvals - FM Approved
  • Switch Type - Snap Action Switch - 5A, 120/240 Vac, 5A Res. @ 30 Vdc
  • Bourdon Tube Material - 403 Stainless Steel
  • Output - SPST Mercury Switch - Opens on Pressure Increase
  • Pressure Range - psig: 40 to 350 (bar: 2.758 to 24.13, kPa: 275.8 to 2,413)
100+ In Stock
$1,445.00CAD
Does not ship to United States
DAWF-7321-3-11S
  • Deadband - Adjustable
  • Enclosure - Weatherproof Enclosure
  • Agency Approvals - FM Approved
  • Switch Type - Snap Action Switch - 5A, 120/240 Vac, 5A Res. @ 30 Vdc
  • Bourdon Tube Material - 403 Stainless Steel
  • Output - SPST Mercury Switch - Closes on Pressure Increase
  • Pressure Range - psig: 50 to 1,000 (bar: 3.447 to 68.95, kPa: 344.7 to 6,895)
100+ In Stock
$1,509.00CAD
Does not ship to United States
DSF-7231-3-7
  • Deadband - Fixed
  • Enclosure - General-Purpose
  • Agency Approvals - FM Approved
  • Switch Type - Snap Action Switch - 15A, 120/240 AC
  • Bourdon Tube Material - Brass
  • Output - SPST Mercury Switch - Closes on Pressure Increase
  • Pressure Range - psig: 5 to 150 (bar: 0.345 to 10.34, kPa: 34.47 to 1,034)
100+ In Stock
$1,520.00CAD
Does not ship to United States
DAH-7331-3-7
  • Deadband - Adjustable
  • Enclosure - Explosion-Proof
  • Agency Approvals - No Additional Approvals
  • Switch Type - Snap Action Switch - 5A, 120/240 Vac, 5A Res. @ 30 Vdc
  • Bourdon Tube Material - Brass
  • Output - SPST Mercury Switch - Closes on Pressure Increase
  • Pressure Range - psig: 5 to 150 (bar: 0.345 to 10.34, kPa: 34.47 to 1,034)
100+ In Stock
$1,561.00CAD
Does not ship to United States
DAHF-7221-3-10S
  • Deadband - Adjustable
  • Enclosure - Explosion-Proof
  • Agency Approvals - FM Approved
  • Switch Type - Snap Action Switch - 15A, 120/240 AC
  • Bourdon Tube Material - 403 Stainless Steel
  • Output - SPST Mercury Switch - Closes on Pressure Increase
  • Pressure Range - psig: 25 to 600 (bar: 1.724 to 41.37, kPa: 172.4 to 4,137)
100+ In Stock
$1,579.00CAD
Does not ship to United States
DSW-7021-3-25S
  • Deadband - Fixed
  • Enclosure - Weatherproof Enclosure
  • Agency Approvals - No Additional Approvals
  • Switch Type - Snap Action Switch - 10A, 120/240 Vac
  • Bourdon Tube Material - 403 Stainless Steel
  • Output - SPST Mercury Switch - Closes on Pressure Increase
  • Pressure Range - -30 Inches Hg to 60 psig
100+ In Stock
$1,596.00CAD
Does not ship to United States
DS-31-153-2
  • Deadband - Fixed
  • Enclosure - General-Purpose
  • Agency Approvals - No Additional Approvals
  • Switch Type - Mercury Switch
  • Bourdon Tube Material - Brass
  • Output - SPDT
  • Pressure Range - -30 Inches Hg to 0 psig
100+ In Stock
$1,666.00CAD
Does not ship to United States
DAWF-7031-3-2
  • Deadband - Adjustable
  • Enclosure - Weatherproof Enclosure
  • Agency Approvals - FM Approved
  • Switch Type - Snap Action Switch - 10A, 120/240 Vac
  • Bourdon Tube Material - Brass
  • Output - SPST Mercury Switch - Closes on Pressure Increase
  • Pressure Range - -30 Inches Hg to 0 psig
100+ In Stock
$1,675.00CAD
Does not ship to United States
DAHF-41-153-23E
  • Deadband - Adjustable
  • Enclosure - Explosion-Proof
  • Agency Approvals - FM Approved
  • Switch Type - Mercury Switch
  • Bourdon Tube Material - 316 Stainless Steel
  • Output - SPDT
  • Pressure Range - -30 Inches Hg to 75 psig
100+ In Stock
$1,810.00CAD
Does not ship to United States
DAW-7041-153-11E
  • Deadband - Adjustable
  • Enclosure - Weatherproof Enclosure
  • Agency Approvals - No Additional Approvals
  • Switch Type - Snap Action Switch - 10A, 120/240 Vac
  • Bourdon Tube Material - 316 Stainless Steel
  • Output - SPDT
  • Pressure Range - psig: 100 to 1,000 (6.895 to 689.5, kPa: 689.5 to 6,895)
100+ In Stock
$1,923.00CAD
Does not ship to United States
DSF-7231-153-3A
  • Deadband - Fixed
  • Enclosure - General-Purpose
  • Agency Approvals - FM Approved
  • Switch Type - Snap Action Switch - 15A, 120/240 AC
  • Bourdon Tube Material - Brass
  • Output - SPDT
  • Pressure Range - psig: 1/8 to 20
100+ In Stock
$1,933.00CAD
Does not ship to United States
DAHF-7021-2-15S
  • Deadband - Adjustable
  • Enclosure - Explosion-Proof
  • Agency Approvals - FM Approved
  • Switch Type - Snap Action Switch - 10A, 120/240 Vac
  • Bourdon Tube Material - 403 Stainless Steel
  • Output - SPST Mercury Switch - Opens on Pressure Increase
  • Pressure Range - psig: 500 to 5,000 (bar: 34.47 to 344.7, kPa: 3,447 to 34, 474)
100+ In Stock
$1,958.00CAD
Does not ship to United States
DAWF-31-153-1
  • Deadband - Adjustable
  • Enclosure - Weatherproof Enclosure
  • Agency Approvals - FM Approved
  • Switch Type - Mercury Switch
  • Bourdon Tube Material - Brass
  • Output - SPDT
  • Pressure Range - psig: 1/8 to 15
100+ In Stock
$2,048.00CAD
Does not ship to United States
DAH-7231-2-2
  • Deadband - Adjustable
  • Enclosure - Explosion-Proof
  • Agency Approvals - No Additional Approvals
  • Switch Type - Snap Action Switch - 15A, 120/240 AC
  • Bourdon Tube Material - Brass
  • Output - SPST Mercury Switch - Opens on Pressure Increase
  • Pressure Range - -30 Inches Hg to 0 psig
100+ In Stock
$2,241.00CAD
Does not ship to United States
DAW-7031-3-9
  • Deadband - Adjustable
  • Enclosure - Weatherproof Enclosure
  • Agency Approvals - No Additional Approvals
  • Switch Type - Snap Action Switch - 10A, 120/240 Vac
  • Bourdon Tube Material - Brass
  • Output - SPST Mercury Switch - Closes on Pressure Increase
  • Pressure Range - psig: 10 to 300 (bar: 0.689 to 20.68, kPa: 68.95 to 2,068)
100+ In Stock
$2,256.00CAD
Does not ship to United States
DAF-41-2-24E
  • Deadband - Adjustable
  • Enclosure - General-Purpose
  • Agency Approvals - FM Approved
  • Switch Type - Mercury Switch
  • Bourdon Tube Material - 316 Stainless Steel
  • Output - SPST Mercury Switch - Opens on Pressure Increase
  • Pressure Range - psig: 10 to 150 (bar: 10 to 10.34, kPa: 0.689 to 10.34, kPa: 68.95 to 1,034)
100+ In Stock
$2,295.00CAD
Does not ship to United States
DSH-7021-2-6S
  • Deadband - Fixed
  • Enclosure - Explosion-Proof
  • Agency Approvals - No Additional Approvals
  • Switch Type - Snap Action Switch - 10A, 120/240 Vac
  • Bourdon Tube Material - 403 Stainless Steel
  • Output - SPST Mercury Switch - Opens on Pressure Increase
  • Pressure Range - psig: 5 to 100 (bar: 0.345 to 6.859, kPa: 34.47 to 689.5)
100+ In Stock
$2,338.00CAD
Does not ship to United States
DSHF-7321-3-11S
  • Deadband - Fixed
  • Enclosure - Explosion-Proof
  • Agency Approvals - FM Approved
  • Switch Type - Snap Action Switch - 5A, 120/240 Vac, 5A Res. @ 30 Vdc
  • Bourdon Tube Material - 403 Stainless Steel
  • Output - SPST Mercury Switch - Closes on Pressure Increase
  • Pressure Range - psig: 50 to 1,000 (bar: 3.447 to 68.95, kPa: 344.7 to 6,895)
100+ In Stock
$2,338.00CAD
Does not ship to United States
DAWF-7331-2-6
  • Deadband - Adjustable
  • Enclosure - Weatherproof Enclosure
  • Agency Approvals - FM Approved
  • Switch Type - Snap Action Switch - 5A, 120/240 Vac, 5A Res. @ 30 Vdc
  • Bourdon Tube Material - Brass
  • Output - SPST Mercury Switch - Opens on Pressure Increase
  • Pressure Range - psig: 5 to 100 (bar: 0.345 to 6.895, kPa: 34.47 to 689.5)
100+ In Stock
$2,357.00CAD
Does not ship to United States
DAW-7031-2-3
  • Deadband - Adjustable
  • Enclosure - Weatherproof Enclosure
  • Agency Approvals - No Additional Approvals
  • Switch Type - Snap Action Switch - 10A, 120/240 Vac
  • Bourdon Tube Material - Brass
  • Output - SPST Mercury Switch - Opens on Pressure Increase
  • Pressure Range - -10 Inches Hg to 12 psig
100+ In Stock
$2,395.00CAD
Does not ship to United States
DAH-7321-2-13S
  • Deadband - Adjustable
  • Enclosure - Explosion-Proof
  • Agency Approvals - No Additional Approvals
  • Switch Type - Snap Action Switch - 5A, 120/240 Vac, 5A Res. @ 30 Vdc
  • Bourdon Tube Material - 403 Stainless Steel
  • Output - SPST Mercury Switch - Opens on Pressure Increase
  • Pressure Range - psig: 300 to 2,500 (bar: 20.68 to 172.4, kPa: 2,068 to 17,237)
100+ In Stock
$2,400.00CAD
Does not ship to United States
DAH-7331-2-8
  • Deadband - Adjustable
  • Enclosure - Explosion-Proof
  • Agency Approvals - No Additional Approvals
  • Switch Type - Snap Action Switch - 5A, 120/240 Vac, 5A Res. @ 30 Vdc
  • Bourdon Tube Material - Brass
  • Output - SPST Mercury Switch - Opens on Pressure Increase
  • Pressure Range - psig: 10 to 200 (bar: 0.689 to 13.79, kPa: 68.95 to 1,379)
100+ In Stock
$2,483.00CAD
Does not ship to United States
DSHF-41-3-11E
  • Deadband - Fixed
  • Enclosure - Explosion-Proof
  • Agency Approvals - FM Approved
  • Switch Type - Mercury Switch
  • Bourdon Tube Material - 316 Stainless Steel
  • Output - SPST Mercury Switch - Closes on Pressure Increase
  • Pressure Range - psig: 100 to 1,000 (6.895 to 689.5, kPa: 689.5 to 6,895)
100+ In Stock
$2,535.00CAD
Does not ship to United States
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Specifications

Brand

Adjustment Type

  • Thumbscrew

Approvals & Certifications

  • CE
  • CSA
  • FM
  • UL

Electrical Connectors

  • 1/2” Conduit
  • 3/4” NPT Female
  • Screw Terminal

Electrical Rating

  • Adjustable Deadband SPDT: 10 A at 120/240 Vac
  • Fixed Deadband 15 A at 120/240 Vac
  • Hermetically Sealed, Fixed Deadband SPDT: 5 A at 120/240 Vac Resistive
  • Hermetically Sealed, Fixed Deadband SPDT: 5 A at 30 Vdc

Environmental Protection

  • Explosion-proof
  • General-purpose
  • NEMA 7
  • NEMA 9
  • NEMA 9A
  • Weatherproof

NPT Connection

  • Explosion-proof: 1/4” NPT Female
  • Weatherproof: 1/2”Male NPT on Ranges 15S & 16S
  • Weatherproof: 1/4” NPT Male

Repeatability

  • ± 1 % of Full Operating Range
  • ± 1.5 % on DS-7300 Models

Sensor Orientation

  • Vertical

Set Point - Decreasing

  • bar: 0 to 552
  • Inches Hg: -30 to 0
  • kPa: 0 to 55,200
  • psi: 0 to 8,000

Set Point - Increasing

  • bar: 0 to 552
  • Inches Hg: -30 to 0
  • kPa: 0 to 55,200
  • psi: 0 to 8,000

Switch Type

  • SPDT (Mercury Switch, Snap Switch, SPDT Hermetically Sealed Snap Switch)
  • SPST Mercury Switch

System Pressure

  • bar: 550
  • kPa: 55,000
  • psig: up to 8,000 for Select Models

Temperature Range

  • 82° C to (180° F)

Wetted Materials

  • 316 Stainless Steel
  • 403 Stainless Steel
  • Brass

  • Compressors
  • Mechanical HVAC or Process Equipment
  • Pump Control

Documentation

Approvals

Brochure

Catalogs

Manuals

show more