Data Sheet

The 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.
Rain tight 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 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.
• Explosion-proof and weatherproof housing provides device protection for outdoor use or harsh environment operation
• External set point screw provides easy access without opening or disassembling enclosure
•Easilyaccessibleelectricalconnectionsimpliestheinstallation
• HVAC applications
• Process applications
• All-weather applications
FEATURES/BENEFITS
DESCRIPTIONAPPLICATIONS
SERIES 1950 | EXPLOSION-PROOF DIFFERENTIAL PRESSURE SWITCH
®
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 in 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 & 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 Ib (1.5 kg); 1950-02 model, 4.4 lb (2 kg).
Agency Approvals CE, CSA, FM, UL.