Dwyer Series 1950 G

Series 1950 G Explosion-proof Differential Pressure Switch

Dwyer Series 1950G
Series 1950G

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.

 

MODELRANGESWITCH
1950G-0-B-120-NA.15-.50" w.c., approx. deadband @ min. set point .06, approx. deadband @ max. set point .11.120 VAC
1950G-00-B-120-NA.07-.15" w.c., approx. deadband @ min. set point .04, approx. deadband @ max. set point .06.120 VAC
1950G-1-B-120-NA.4-1.6" w.c., approx. deadband @ min. set point .11, approx. deadband @ max. set point .29.120 VAC
1950G-10-B-120-NA3-11" w.c., approx. deadband @ min. set point .9, approx. deadband @ max. set point 1.8.120 VAC
1950G-20-B-120-NA4-20" w.c., approx. deadband @ min. set point 1.2, approx. deadband @ max. set point 3.0.120 VAC
1950G-5-B-120-NA1.4-5.5" w.c., approx. deadband @ min. set point .4, approx. deadband @ max. set point .9.120 VAC
1950G-0-B-24-NA.15-.50" w.c., approx. deadband @ min. set point .06, approx. deadband @ max. set point .11.24 VDC
1950G-00-B-24-NA.07-.15" w.c., approx. deadband @ min. set point .04, approx. deadband @ max. set point .06.24 VDC
1950G-1-B-24-NA.4-1.6" w.c., approx. deadband @ min. set point .11, approx. deadband @ max. set point .29.24 VDC
1950G-10-B-24-NA3-11" w.c., approx. deadband @ min. set point .9, approx. deadband @ max. set point 1.8.24 VDC
1950G-20-B-24-NA4-20" w.c., approx. deadband @ min. set point 1.2, approx. deadband @ max. set point 3.0.24 VDC
1950G-5-B-24-NA1.4-5.5" w.c., approx. deadband @ min. set point .4, approx. deadband @ max. set point .9.24 VDC