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 60 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 weatherproof
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.
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: IP64, NEMA 3, 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, UL, CSA, FM.
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