Dwyer Series 1950 G

Series 1950 G Explosion-proof Differential Pressure Switch

Explosion-proof, Weatherproof, Compatible with Natural Gases

The Dwyer Series 1950 G Explosion-Proof Switch combines the best features of the popular Dwyer® Series 1950 Pressure Switch with the benefit of natural gas compatibility. Units are rain-tight for outdoor installations, and are UL listed for use in Class I, Groups A, B, C, & D; Class II, Groups E, F, & G and Class III atmospheres, Directive 94/9/EC (ATEX) Compliant for CE ATEX II 2G Exd IIB+H2 T6, CSA & FM approved for Class I, Div. 1, Groups B, C, D; Class II, Div. 1, Groups E, F, G and Class III atmospheres IECEx Ex d IIB+H2 T6 (-40°C < Ta < +60°C). The 1950G is very compact, about half the weight and bulk of equivalent conventional explosion-proof switches.

Easy access to the SPDT relay and power supply terminals is provided by removing the top plate of the aluminum housing. A supply voltage of 24 VDC, 120 or 240 VAC is required. A captive screw allows the cover to swing aside while remaining attached to the unit. Adjustment to the set point of the switch can be made without dis-assembly of the housing.

Series 1950 G Specifications

• Service: Air and compatible combustible gases.
• Wetted Materials: Consult factory.
• Temperature Limits: 0 to 140°F (-17 to 60°C). Note: Set point drift may occur with ambient temperature changes.
• Pressure Limits: 45″ w.c. (11.2 kPa) continuous; 10 psig (68.95 kPa) surge.
• Enclosure Rating: NEMA 3 (IP54), NEMA 7 and 9.Switch Type:1 Form C relay (SPDT).
• Electrical Rating: 10A, 120/240 VAC, 28 VDC. Resistive 50mA, 125 VDC.
• Power Requirements: 24 VDC ±10%. 120 or 240 VAC ±10% optional.
• Electrical Connections: Internal terminal block.
• 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: 2 lbs 15.7 oz (1.35 kg).
• Agency Approvals: ATEX, CE, CSA, FM, IECEx, UL.