Series 1950 Explosion-Proof Dwyer Pressure Switch

Series 1950 Explosion-Proof Dwyer Pressure Switch combines the best features of the popular Dwyer® Series 1900 Pressure Switch with an integral explosion-proof and weatherproof housing, making it an exceptional value for either application.

It is CE, UL and CSA listed, FM approved for use in Class I, Div 1, Groups C and D, Class II Groups E, F, and G and Class III hazardous atmospheres (NEMA 7 & 9), Raintight NEMA 3 (IP54). Weatherproof features include a drain plug and O-ring seal in cover. Electrical connections are easily made by removing front cover. For convenience the set point adjustment screw is located on the outside of the housing.

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Features

  • Explosion-proof and weatherproof housing provides device protection for outdoor use or harsh environment operation
  • External set point screw provides easy access that simplifies making adjustments without opening or disassembling enclosure
  • Easily accessible electrical connection simplifies the installation

Applications

  • HVAC applications
  • Process applications
  • All-weather applications

 

Specifications

  • Service: Air and non-combustible, compatible gases.
  • Wetted Materials: Consult factory.
  • Temperature Limits: -40 to 140°F (-40 to 60°C); 0 to 140°F (-17.8 to 60°C)for 1950P-8, 15, 25, and 50. -30 to 130°F (-34.4 to 54.4°C) for 1950-02.
  • Pressure Limits: Continuous: 1950’s – 45″ w.c. (0.11 bar); 1950P’s – 35 psi (2.41 bar); 1950P-50 only – 70 psi (4.83 bar). Surge: 1950’s – 10 psi (0.69 bar); 1950P’s – 50 psi (3.45 bar); 1950P-50 only – 90 psi (6.21 bar).
  • Enclosure Rating: NEMA 3 (IP54), NEMA 7 and 9.
  • Switch Type: Single-pole double-throw (SPDT).
  • Electrical Rating: 15 A @ 125, 250, 480 VAC, 60 Hz. Resistive 1/8 HP @ 125 VAC, 1/4 HP @ 250 VAC, 60 Hz.
  • Electrical Connections: 3 screw type, common, normally open and normally closed.
  • Process Connections: 1/8″ female NPT.
  • Mounting Orientation: Diaphragm in vertical position. Consult factory for other position orientations.
  • Set Point Adjustment: Screw type on top of housing.
  • Weight: 3.25 lb (1.5 kg); 1950-02 model 4.4 lb (2 kg).
  • Compliance: CE, CSA, FM, UL.