Dwyer Series 1950G Explosion-proof Differential Pressure Switch
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 Groups A, B, C, & D; Class II, Groups E, F, & G and Class III atmospheres, Directive 94/9/EC (ATEX) Compliant for 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 Exd 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.
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| Cat # | Ranges Inches, w.c. | Max.Set Point | Min.Set Point |
| 1950G-00-B-24-NA | .07 to .15 | .06 | .04 |
| 1950G-0-B-24-NA | .15 to .50 | .11 | .06 |
| 1950G-1-B-24-NA | .4 to 1.6 | .29 | .11 |
| 1950G-5-B-24-NA | 1.4 to 5.5 | .9 | .4 |
| 1950G-10-B-24-NA | 3 to 11 | 1.8 | .9 |
| 1950G-20-B-24-NA | 4 to 20 | 3.0 | 1.2 |
| Service: | Air and compatible combustible gases. |
| Wetted Materials: | Contact 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 & 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 lb, 15.7 oz (1.35 kg). |
| Agency Approvals: | CE, UL, CSA, FM, ATEX, IECEx. |
