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, 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 disassembly of the housing.
| Model | | Description | |
|---|
| 1950G-0-B-120-NA | |
Explosion-proof differential pressure switch, range .15-.50" w.c., approx. deadband @ min. set point .06, approx. deadband @ max. set point .11. | |
| 1950G-00-B-120-NA | |
Explosion-proof differential pressure switch, range .07-.15" w.c., approx. deadband @ min. set point .04, approx. deadband @ max. set point .06. | |
| 1950G-1-B-120-NA | |
Explosion-proof differential pressure switch, range .4-1.6" w.c., approx. deadband @ min. set point .11, approx. deadband @ max. set point .29. | |
| 1950G-10-B-120-NA | |
Explosion-proof differential pressure switch, range 3-11" w.c., approx. deadband @ min. set point .9, approx. deadband @ max. set point 1.8. | |
| 1950G-20-B-120-NA | |
Explosion-proof differential pressure switch, range 4-20" w.c., approx. deadband @ min. set point 1.2, approx. deadband @ max. set point 3.0. | |
| 1950G-5-B-120-NA | |
Explosion-proof differential pressure switch, range 1.4-5.5" w.c., approx. deadband @ min. set point .4, approx. deadband @ max. set point .9. | |
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.