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Series DA/DS Bourdon Tube Pressure Switch

Brand: Dwyer Instruments, LLC

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

1 - 12 of 4,609 Part Numbers
DA-21-153-10S
DA-21-153-10S
DWYER Pressure Switch, 403 SST Bourdon Tube, Range 25-600 psig, 25 psig Min. Deadband.
  • Deadband - Adjustable
  • Enclosure - General-Purpose
  • Agency Approvals - No Additional Approvals
  • Switch Type - Mercury Switch
  • Bourdon Tube Material - 403 Stainless Steel
  • Output - SPDT
  • Pressure Range - psig: 25 to 600 (bar: 1.724 to 41.37, kPa: 172.4 to 4,137)
DA-21-153-11S
DA-21-153-11S
DWYER Pressure Switch, 403 SST Bourdon Tube, Range 50-1000 psig, 60 psig Min. Deadband.
  • Deadband - Adjustable
  • Enclosure - General-Purpose
  • Agency Approvals - No Additional Approvals
  • Switch Type - Mercury Switch
  • Bourdon Tube Material - 403 Stainless Steel
  • Output - SPDT
  • Pressure Range - psig: 50 to 1,000 (bar: 3.447 to 68.95, kPa: 344.7 to 6,895)
DA-21-153-12S
DA-21-153-12S
DWYER Pressure Switch, 403 SST Bourdon Tube, Range 100-1500 psig, 90 psig Min. Deadband.
  • Deadband - Adjustable
  • Enclosure - General-Purpose
  • Agency Approvals - No Additional Approvals
  • Switch Type - Mercury Switch
  • Bourdon Tube Material - 403 Stainless Steel
  • Output - SPDT
  • Pressure Range - psig: 100 to 1,500 (bar: 6.895 to 103.4, kPa: 689.5 to 10,342)
DA-21-153-13S
DA-21-153-13S
DWYER Pressure Switch, 403 SST Bourdon Tube, Range 300-2500 psig, 150 psig Min. Deadband.
  • Deadband - Adjustable
  • Enclosure - General-Purpose
  • Agency Approvals - No Additional Approvals
  • Switch Type - Mercury Switch
  • 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)
DA-21-153-15S
DA-21-153-15S
DWYER Pressure Switch, 403 SST Bourdon Tube, Range 500-5000 psig, 450 psig Min. Deadband.
  • Deadband - Adjustable
  • Enclosure - General-Purpose
  • Agency Approvals - No Additional Approvals
  • Switch Type - Mercury Switch
  • 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)
DA-21-153-16S
DA-21-153-16S
DWYER Pressure Switch, 403 SST Bourdon Tube, Range 800-8000 psig, 750 psig Min. Deadband.
  • Deadband - Adjustable
  • Enclosure - General-Purpose
  • Agency Approvals - No Additional Approvals
  • Switch Type - Mercury Switch
  • Bourdon Tube Material - 403 Stainless Steel
  • Output - SPDT
  • Pressure Range - psig: 800 to 8,000 (bar: 55.16 to 551.6, kPa: 5,516 to 55,158)
DA-21-153-25S
DA-21-153-25S
DWYER Pressure Switch, 403 SST Bourdon Tube, Range 30" Hg Vac-60 psig, 6 psig Min. Deadband.
  • Deadband - Adjustable
  • Enclosure - General-Purpose
  • Agency Approvals - No Additional Approvals
  • Switch Type - Mercury Switch
  • Bourdon Tube Material - 403 Stainless Steel
  • Output - SPDT
  • Pressure Range - -30 Inches Hg to 60 psig
DA-21-153-26S
DA-21-153-26S
DWYER Pressure Switch, 403 SST Bourdon Tube, Range 30" Hg Vac-75 psig, 8 psig Min. Deadband.
  • Deadband - Adjustable
  • Enclosure - General-Purpose
  • Agency Approvals - No Additional Approvals
  • Switch Type - Mercury Switch
  • Bourdon Tube Material - 403 Stainless Steel
  • Output - SPDT
  • Pressure Range - -30 Inches Hg to 75 psig
DA-21-153-5S
DA-21-153-5S
DWYER Pressure Switch, 403 SST Bourdon Tube, Range 2-60 psig, 4 psig Min. Deadband.
  • Deadband - Adjustable
  • Enclosure - General-Purpose
  • Agency Approvals - No Additional Approvals
  • Switch Type - Mercury Switch
  • Bourdon Tube Material - 403 Stainless Steel
  • Output - SPDT
  • Pressure Range - psig: 2 to 60 (bar: 0.138 to 4.137, kPa: 13.79 to 413.7)
DA-21-153-6S
DA-21-153-6S
DWYER Pressure Switch, 403 SST Bourdon Tube, Range 5-100 psig, 6 psig Min. Deadband.
  • Deadband - Adjustable
  • Enclosure - General-Purpose
  • Agency Approvals - No Additional Approvals
  • Switch Type - Mercury Switch
  • Bourdon Tube Material - 403 Stainless Steel
  • Output - SPDT
  • Pressure Range - psig: 5 to 100 (bar: 0.345 to 6.859, kPa: 34.47 to 689.5)
DA-21-153-8S
DA-21-153-8S
DWYER Pressure Switch, 403 SST Bourdon Tube, Range 10-200 psig, 8 psig Min. Deadband.
  • Deadband - Adjustable
  • Enclosure - General-Purpose
  • Agency Approvals - No Additional Approvals
  • Switch Type - Mercury Switch
  • Bourdon Tube Material - 403 Stainless Steel
  • Output - SPDT
  • Pressure Range - psig: 10 to 200 (bar: 0.689 to 13.79, kPa: 68.95 to 1,379)
DA-21-153-9AS
DA-21-153-9AS
DWYER Pressure Switch, 403 SST Bourdon Tube, Range 40-350 psig, 14 psig Min. Deadband.
  • Deadband - Adjustable
  • Enclosure - General-Purpose
  • Agency Approvals - No Additional Approvals
  • Switch Type - Mercury Switch
  • Bourdon Tube Material - 403 Stainless Steel
  • Output - SPDT
  • Pressure Range - psig: 40 to 350 (bar: 2.758 to 24.13, kPa: 275.8 to 2,413)
1 - 12 of 4,609 Part Numbers

Specifications

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
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