Series 1950 Explosion-proof Differential Pressure Switch

Series 1950 Explosion-proof Differential Pressure Switch

Series 1950G Explosion-Proof Differential Pressure Switch

Series 1950G Explosion-Proof Differential Pressure Switch

Series DA/DS Bourdon Tube Pressure Switches

Pressure Ranges to 2500 psi (172.4 bar)

Customers tell us that the 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 we offer the snap action switch. Hermetically sealed mercury switch also available.

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Product Applications

  • Compressors
  • Mechanical HVAC or process equipment
  • Pump control
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Grouped product items
Model Description Availability* Qty Price
DA-21-153-11S Pressure switch, 403SS Bourdon tube, range 50-1000 psig, 60 psig min. deadband. Call for Details*
$1,844.95
DA-21-153-12S Pressure switch, 403SS Bourdon tube, range 100-1500 psig, 90 psig min. deadband. Call for Details*
$1,976.00
DA-21-153-13S Pressure switch, 403SS Bourdon tube, range 300-2500 psig, 150 psig min. deadband. Call for Details*
$1,976.00
DA-21-153-15S Pressure switch, 403SS Bourdon tube, range 500-5000 psig, 450 psig min. deadband. Call for Details*
$1,997.85
DA-21-153-25S Pressure switch, 403SS Bourdon tube, range 30" Hg Vac-60 psig, 6 psig min. deadband. Call for Details*
$1,306.25
DA-21-153-26S Pressure switch, 403SS Bourdon tube, range 30" Hg Vac-75 psig, 8 psig min. deadband. Call for Details*
$1,306.25
DA-21-153-5S Pressure switch, 403SS Bourdon tube, range 2-60 psig, 4 psig min. deadband. Call for Details*
$1,306.25
DA-21-153-6S Pressure switch, 403SS Bourdon tube, range 5-100 psig, 6 psig min. deadband. Call for Details*
$1,306.25
DA-21-153-8S Pressure switch, 403SS Bourdon tube, range 10-200 psig, 8 psig min. deadband. Call for Details*
$1,306.25
DA-21-153-9AS Pressure switch, 403SS Bourdon tube, range 40-350 psig, 14 psig min. deadband. Call for Details*
$1,470.55
DA-21-153-9S Pressure switch, 403SS Bourdon tube, range 10-300 psig, 14 psig min. deadband. Call for Details*
$1,395.70
DA-31-153-1 Pressure switch, brass Bourdon tube, range 1/8-15 psig, 1 psig min. deadband. Call for Details*
$979.70
DA-31-153-2 Pressure switch, brass Bourdon tube, range 30-0" Hg Vac, 2" Hg min. deadband. Call for Details*
$979.70
DA-31-153-27 Pressure switch, brass Bourdon tube, range 25" Hg Vac-50 psig, 3.5 psig min. deadband. Call for Details*
$979.70
DA-31-153-3 Pressure switch, brass Bourdon tube, range 10" Hg Vac-12 psig, 1 psig min. deadband. Call for Details*
$979.70
DA-31-153-3A Pressure switch, brass Bourdon tube, range 1/8-20 psig, 1 psig min. deadband. Call for Details*
$979.70
DA-31-153-4 Pressure switch, brass Bourdon tube, range 1-35 psig, 1.75 psig min. deadband. Call for Details*
$979.70
DA-31-153-5 Pressure switch, brass Bourdon tube, range 2-60 psig, 3 psig min. deadband. Call for Details*
$979.70
DA-31-153-6 Pressure switch, brass Bourdon tube, range 5-100 psig, 3.75 psig min. deadband. Call for Details*
$979.70
DA-31-153-7 Pressure switch, brass Bourdon tube, range 5-150 psig, 6 psig min. deadband. Call for Details*
$979.70
DA-31-153-8 Pressure switch, brass Bourdon tube, range 10-200 psig, 8 psig min. deadband. Call for Details*
$1,082.65
DA-31-153-9 Pressure switch, brass Bourdon tube, range 10-300 psig, 12 psig min. deadband. Call for Details*
$1,082.65
DA-41-153-11E Pressure switch, 316SS Bourdon tube, range 100-1000 psig, 100 psig min. deadband. Call for Details*
$1,976.00
DA-41-153-13E Pressure switch, 316SS Bourdon tube, range 200-2500 psig, 210 psig min. deadband. Call for Details*
$1,976.00
DA-41-153-21E Pressure switch, 316SS Bourdon tube, range 30-400 psig, 30 psig min. deadband. Call for Details*
$1,521.50
DA-41-153-22E Pressure switch, 316SS Bourdon tube, range 75-800 psig, 75 psig min. deadband. Call for Details*
$1,725.35
DA-41-153-23E Pressure switch, 316SS Bourdon tube, range 5-75 psig, 3 psig min. deadband. Call for Details*
$1,395.70
DA-41-153-24E Pressure switch, 316SS Bourdon tube, range 10-150 psig, 6 psig min. deadband. Call for Details*
$1,395.70
DA-41-153-26E Pressure switch, 316SS Bourdon tube, range 30" Hg Vac-75 psig, 7 psig min. deadband. Call for Details*
$1,395.70
DA-41-153-6E Pressure switch, 316SS Bourdon tube, range 10-100 psig, 7 psig min. deadband. Call for Details*
$1,395.70
DA-41-153-9E Pressure switch, 316SS Bourdon tube, range 10-300 psig, 18 psig min. deadband. Call for Details*
$1,449.75
DA-41-2-11E Pressure switch, 316SS Bourdon tube, range 100-1000 psig, 100 psig min. deadband. Call for Details*
$1,976.00
DA-41-2-13E Pressure switch, 316SS Bourdon tube, range 200-2500 psig, 210 psig min. deadband. Call for Details*
$1,976.00
DA-41-2-21E Pressure switch, 316SS Bourdon tube, range 30-400 psig, 30 psig min. deadband. Call for Details*
$1,521.50
DA-41-2-23E Pressure switch, 316SS Bourdon tube, range 5-75 psig, 3 psig min. deadband. Call for Details*
$1,395.70
DA-41-2-24E Pressure switch, 316SS Bourdon tube, range 10-150 psig, 6 psig min. deadband. Call for Details*
$1,395.70
DA-41-2-26E Pressure switch, 316SS Bourdon tube, range 30" Hg Vac-75 psig, 7 psig min. deadband. Call for Details*
$1,395.70
DA-41-2-6E Pressure switch, 316SS Bourdon tube, range 10-100 psig, 7 psig min. deadband. Call for Details*
$1,395.70
DA-41-2-9E Pressure switch, 316SS Bourdon tube, range 10-300 psig, 18 psig min. deadband. Call for Details*
$1,449.75
DA-7021-153-10S Pressure switch, 403SS Bourdon tube, range 25-600 psig, 67.5 psig min. deadband. Call for Details*
$1,381.10
DA-7021-153-11S Pressure switch, 403SS Bourdon tube, range 50-1000 psig, 142.5 psig min. deadband. Call for Details*
$1,734.70
DA-7021-153-12S Pressure switch, 403SS Bourdon tube, range 100-1500 psig, 195 psig min. deadband. Call for Details*
$1,839.75
DA-7021-153-13S Pressure switch, 403SS Bourdon tube, range 300-2500 psig, 390 psig min. deadband. Call for Details*
$1,839.75
DA-7021-153-15S Pressure switch, 403SS Bourdon tube, range 500-5000 psig, 1350 psig min. deadband. Call for Details*
$1,874.10
DA-7021-153-25S Pressure switch, 403SS Bourdon tube, range 30" Hg Vac-60 psig, 18 psig min. deadband. Call for Details*
$1,210.55
DA-7021-153-26S Pressure switch, 403SS Bourdon tube, range 30" Hg Vac-75 psig, 22.5 psig min. deadband. Call for Details*
$1,210.55
DA-7021-153-5S Pressure switch, 403SS Bourdon tube, range 2-60 psig, 13.5 psig min. deadband. Call for Details*
$1,210.55
DA-7021-153-6S Pressure switch, 403SS Bourdon tube, range 5-100 psig, 19.5 psig min. deadband. Call for Details*
$1,210.55
DA-7021-153-8S Pressure switch, 403SS Bourdon tube, range 10-200 psig, 22.5 psig min. deadband. Call for Details*
$1,210.55
DA-7021-153-9AS Pressure switch, 403SS Bourdon tube, range 40-350 psig, 30 psig min. deadband. Call for Details*
$1,381.10
DA-7021-153-9S Pressure switch, 403SS Bourdon tube, range 10-300 psig, 28.5 psig min. deadband. Call for Details*
$1,381.10
DA-7031-153-1 Pressure switch, brass Bourdon tube, range 1/8-15 psig, 6 psig min. deadband. Call for Details*
$903.75
DA-7031-153-2 Pressure switch, brass Bourdon tube, range 30-0" Hg Vac, 13.5" Hg min. deadband. Call for Details*
$903.75
DA-7031-153-27 Pressure switch, brass Bourdon tube, range 25" Hg Vac-50 psig, 12 psig min. deadband. Call for Details*
$903.75
DA-7031-153-3 Pressure switch, brass Bourdon tube, range 10" Hg Vac-12 psig, 6 psig min. deadband. Call for Details*
$903.75
DA-7031-153-3A Pressure switch, brass Bourdon tube, range 1/8-20 psig, 6 psig min. deadband. Call for Details*
$903.75
DA-7031-153-4 Pressure switch, brass Bourdon tube, range 1-35 psig, 7.5 psig min. deadband. Call for Details*
$903.75
DA-7031-153-5 Pressure switch, brass Bourdon tube, range 2-60 psig, 9 psig min. deadband. Call for Details*
$903.75
DA-7031-153-6 Pressure switch, brass Bourdon tube, range 5-100 psig, 13.5 psig min. deadband. Call for Details*
$903.75
DA-7031-153-7 Pressure switch, brass Bourdon tube, range 5-150 psig, 24 psig min. deadband. Call for Details*
$903.75
DA-7031-153-8 Pressure switch, brass Bourdon tube, range 10-200 psig, 24 psig min. deadband. Call for Details*
$995.30
DA-7031-153-9 Pressure switch, brass Bourdon tube, range 10-300 psig, 37.5 psig min. deadband. 1-3 days*
$995.30
DA-7041-153-13E Pressure switch, 316SS Bourdon tube, range 200-2500 psig, 600 psig min. deadband. Call for Details*
$1,837.70
DA-7041-153-21E Pressure switch, 316SS Bourdon tube, range 30-400 psig, 78 psig min. deadband. Call for Details*
$1,440.40
DA-7041-153-22E Pressure switch, 316SS Bourdon tube, range 75-800 psig, 180 psig min. deadband. Call for Details*
$1,620.30
DA-7041-153-23E Pressure switch, 316SS Bourdon tube, range 5-75 psig, 12 psig min. deadband. Call for Details*
$1,313.50
DA-7041-153-24E Pressure switch, 316SS Bourdon tube, range 10-150 psig, 16.5 psig min. deadband. Call for Details*
$1,313.50
DA-7041-153-26E Pressure switch, 316SS Bourdon tube, range 30" Hg Vac-75 psig, 15 psig min. deadband. Call for Details*
$1,313.50
DA-7041-153-6E Pressure switch, 316SS Bourdon tube, range 10-100 psig, 15 psig min. deadband. Call for Details*
$1,313.50
DA-7041-153-9E Pressure switch, 316SS Bourdon tube, range 10-300 psig, 42 psig min. deadband. Call for Details*
$1,313.50
DS-7231-153-1 Pressure switch, brass Bourdon tube, range 1/8-15 psig, 1.5 psig fixed deadband. Call for Details*
$903.75
DS-7231-153-2 Pressure switch, brass Bourdon tube, range 30-0" Hg Vac, 3" Hg fixed deadband. Call for Details*
$903.75
DS-7231-153-3 Pressure switch, brass Bourdon tube, range 10" Hg Vac-12 psig, 1.5 psig fixed deadband. Call for Details*
$903.75
DS-7231-153-3A Pressure switch, brass Bourdon tube, range 1/8-20 psig, 1.5 psig fixed deadband. Call for Details*
$903.75
DS-7231-153-4 Pressure switch, brass Bourdon tube, range 1-35 psig, 1.5 psig fixed deadband. Call for Details*
$903.75
DS-7231-153-5 Pressure switch, brass Bourdon tube, range 2-60 psig, 2 psig fixed deadband. Call for Details*
$903.75
DS-7231-153-6 Pressure switch, brass Bourdon tube, range 5-100 psig, 2.5 psig fixed deadband. Call for Details*
$903.75
DS-7231-153-7 Pressure switch, brass Bourdon tube, range 5-150 psig, 3 psig fixed deadband. Call for Details*
$903.75
DS-7231-153-8 Pressure switch, brass Bourdon tube, range 10-200 psig, 4 psig fixed deadband. Call for Details*
$995.30
DA-21-153-10S Pressure switch, 403SS Bourdon tube, range 25-600 psig, 25 psig min. deadband. Call for Details*
$1,470.55
DS-7231-153-9 Pressure switch, brass Bourdon tube, range 10-300 psig, 5 psig fixed deadband. Call for Details*
$995.30

Specifications

Wetted Materials:
Brass, 403 SS, or 316 SS.
Temperature Limit:
180°F (82°C).
Pressure Limit:
Maximum pressure of the operating range.
Enclosure Rating:
General purpose, weatherproof or explosion-proof.
Repeatability:
±1% of full operating range, ±1.5% on DS-7300 models.
Switch Type:
SPST mercury switch, SPDT mercury switch, SPDT snap switch.
Electrical Rating:
See Catalog page.
Electrical Connections:
Screw terminal.
Conduit Connection:
General purpose: 1/2" hole for conduit hub. Weatherproof: 1/2" conduit hub. Explosion-proof: 3/4" female NPT.
Process Connection:
General purpose and weatherproof: 1/4" male NPT; 1/2" male NPT on range 15S and 16S. Explosion-proof: 1/2" male NPT and 1/4" female NPT.
Mounting Orientation:
Vertical.
Set Point Adjustment:
Thumbscrew.
Weight:
General purpose: 4 lb (1.8 kg). Weatherproof: 6 lb (2.7 kg). Explosion-proof: 8 lb (3.5 kg).
Deadband:
See Catalog page.
Compliance:
CSA, FM, UL. (Consult factory for FM approval models.)

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 setpoint adjustments 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

Options

  • Explosion-proof Enclosure (Series DAH): Suitable for Class I, Groups C and D; NEMA 7; Class II, Groups E, F, G; Class III NEMA 9 and 9A, Division 1. Add "H" to model number after DA or DS. Example: DAH-31-153-7.
  • FM Approved: For general purpose and explosion-proof models see Agency Approvals on Specification page. Add "F" to model number after DA, DS, DAH or DSH. Examples: DAF-31-153-7 or DAHF-31-153-7.
  • Other Options (consult factory): DPDT switches or other switch types, fixed deadband mercury switch units for low deadband applications, manual reset operation, two-stage operation, acetal bushed movement for applications with high amounts of vibration and/or pulsation, fungus proofing, siphon, diaphragm seals, mounting flange and remote connection.
  • Weatherproof Enclosure (Series DAW): Add "W" to model number after DA or DS and change 1 to 3. Example: DAW-33-153-7.
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