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    Series 1950 Explosion-proof Differential Pressure Switch

    Explosion-proof Differential Pressure Switch
    Compact, Low Cost, Explosion-proof and Weatherproof

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    Series 1950 Explosion-proof Differential Pressure Switch

    Compact, Low Cost, Explosion-proof and Weatherproof

    SERIES 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 (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. Twelve models offer set points from .03 to 20 in w.c. (0.0075 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.

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

    Product Applications

    • HVAC applications
    • Process applications
    • All-weather applications
    More Information
    Model Chart
    EXAMPLE 1950 02 2 S AT Series 1950-02-2S-AT Explosion-proof Differential Pressure Switch, range 0.03-0.10" w.c., mica silver contact micro switch, silicone diaphragm, with aluminum tag.
    SERIES 1950
    1950P    		         Explosion-proof Differential Pressure Switch (for Inches w.c. Ranges)
    Explosion-proof Differential Pressure Switch (for psid Ranges)
    RANGE   02
    00
    0
    1
    5
    10
    20
    2
    8
    15
    25
    50    		       0.03-0.10" w.c.
    0.07-0.15" w.c.
    0.15-0.5" w.c.
    0.4-1.6" w.c.
    1.5-5.5" w.c.
    3.0-11.0" w.c.
    4.0-20.0" w.c.
    0.5-2.0 psid
    1.5-8.0 psid
    3.0-15.0 psid
    4.0-25.0 psid
    15.0-50.0 psid
    MICRO SWITCH TYPE     2
    6
    M    		     10G Mica Silver Contact
    10G Phenolic Gold Contact
    10G Phenolic Silver Contact
    DIAPHRGM MATERIAL       B
    F
    N
    S
    V    		   Buna-N
    Fluorosilicone
    Neoprene  (1950 only)
    Silicone  (1950 only)
    Fluoroelastomer  (1950 only)
    OPTIONS         AT
    PRESET
    ST    		 Aluminum Tag
    Preset
    Stainless Steel Tag
    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).
    Agency Approvals: CE, CSA, FM, UL.
    • 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