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1950 Series (PSID) Explosion- Proof Differnetial Pressure Switch

SKU: 1950
RETAIL: 143.00
BASE PRICE: 141.00

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Series 1950


Differential Explosion- Proof Switch

Compact, Low Cost, Explosion-Proof and Weatherproof

Model 1950 Explosion-Proof Differential 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). 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. Twelve models offer set points from .03 to 20˝ w.c. (7.5 to 5 kPa) and from .5 to 50 psi (0.035 to 3.5 bar). The unit is very light and compact,  about half the weight and bulk of other explosion-proof or weather-proof switches with separate enclosures.



  • Service: Air and non-combustible, compatible gases

  • Wetted Material :Consult Factory

  • Switch Type: SPDT16 Amp SPDT relay @ 250 VAC resistive.

  • AMP Rating: 15A @ 125, 250, 480 VAC resistive

  • HP:  1/8 HP @ 125 VAC, 1/4 HP @ 250 VAC, 60 Hz

  • Power Requirements: Depending on Model selected

  • Process Connection: 1/8" female NPT.

  • Enclousure Type: IP64, NEMA 3, 7 and 9



Available Series 1950 Switches

Models, Operating Ranges and Dead Bands

Model* Number

Range, PSID

Approximate Dead Band at


Set Point


Set Point

1950P-2-2F 1950P-8-2F 1950P-15-2F 1950P-25-2F 1950P-50-2F

0.5 to 2

1.5 to 8

3 to 15

 4 to 25

15 to 50











CAUTION: For use only with air or compatible gases. Applications with hazardous atmospheres and a single positive pressure may require special venting.

*P=PSID range models


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