Dwyer Series 1950G Explosion-Proof Differential
Pressure Switch
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| Explosion-Proof, Weatherproof, Compatible with
Natural Gases |
 The
Model 1950G 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, ATEX (approval pending) for EExd IIB & Hydrogen
T6, and CSA & FM approved for Class I, Div. 1, Groups B,
C, D; Class II, Div. 1, Groups E, F, G and Class III atmospheres.
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 disassembly of the housing. See Dimensions
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| SPECIFICATIONS |
Service: Air and compatible combustible gases.
Wetted Materials: Consult Factory.
Temperature Limits: 0 to 140°F (18 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: IP64, NEMA 3, 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: CE, UL, CSA, FM ATEX pending. |
| Popular Models |
| Model Number |
Range, Inches W.C. |
Approx. Dead Band @ Min. Set Point |
Approx. Dead Band @ Max. Set Point |
| 1950G-00-B-120 |
.07 to .15 |
approx. deadband at .04 |
approx. deadband at .06 |
| 1950G-0-B-120 |
.15 to .50 |
approx. deadband at .06 |
approx. deadband at .11 |
| 1950G-1-B-120 |
.4 to 1.6 |
approx. deadband at .11 |
approx. deadband at .29 |
| 1950G-5-B-120 |
1.4 to 5.5 |
approx. deadband at .4 |
approx. deadband at .9 |
| 1950G-10-B-120 |
3 to 11 |
approx. deadband at .9 |
approx. deadband at 1.8 |
| 1950G-20-B-120 |
4 to 20 |
approx. deadband at 1.2 |
approx. deadband at 3.0 |
| 1950G-00-B-24DC |
.07 to .15 |
approx. deadband at .04 |
approx. deadband at .06 |
| 1950G-0-B-24DC |
.15 to .50 |
approx. deadband at .06 |
approx. deadband at .11 |
| 1950G-1-B-24DC |
.4 to 1.6 |
approx. deadband at .11 |
approx. deadband at .29 |
| 1950G-5-B-24DC |
1.4 to 5.5 |
approx. deadband at .4 |
approx. deadband at .9 |
| 1950G-10-B-24DC |
3 to 11 |
approx. deadband at .9 |
approx. deadband at 1.8 |
| 1950G-20-B-24DC |
4 to 20 |
approx. deadband at 1.2 |
approx. deadband at 3.0 |
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