Dwyer 1950 Explosion-Proof Differential Pressure Switch for Air and Non-Combustible Gases
Explosion-proof and weatherproof differential pressure switch for air and non-combustible gases in HVAC and process applications. Operating ranges from 0.03" to 20" W.C. and 0.5 to 50 PSID.
Series 1950 differential pressure switch combines the features of the popular Dwyer Series 1900 pressure switch with an integral explosion-proof and weatherproof housing. It's optimal for use in HVAC, process, and all-weather applications for air and non-combustible gas service.
Weatherproof design features a drain plug and O-ring seal in cover. Series 1950 is smaller and weights about half of other explosion-proof or weatherproof switches with separate enclosures.
- Operating ranges: 0.03" to 20" W.C. and 0.5 to 50 PSI
- SPDT switch output
- 1/8" NPTF process connection; Three screw-type electrical connections (common, normally open, and normally closed)
- Make adjustments with external setpoint screw without opening or disassembling enclosure
- CE, UL and CSA listed, FM approved for use in Class I, Div 1, Groups C and D, Class II Groups E, F, and G and Class III hazardous atmospheres (NEMA 7 & 9)
- Explosion-proof and weatherproof housing provides device protection for outdoor use or harsh environment operation
- Raintight NEMA 3 (IP54) enclosure
- CE, CSA, FM, UL approvals
Model Selection Guide
Use this table to find the right model for your application. Don't see the option you need? Call a Lesman sales specialist at 800-953-7626.
| Operating Range | Deadband | Temperature Limits | Pressure Limits | Click for Price
and Availability | ||
|---|---|---|---|---|---|---|
| Min Setpoint | Max Setpoint | Continuous | Surge | |||
| 0.07" to 0.15" WC | 0.04 | 0.05 | -40° to 140° F | 45" WC | 10 PSI | 1950-00-2F |
| 0.15" to 0.50" WC | 0.1 | 0.15 | -40° to 140° F | 45" WC | 10 PSI | 1950-0-2F |
| 0.4" to 1.6" WC | 0.15 | 0.2 | -40° to 140° F | 45" WC | 10 PSI | 1950-1-2F |
| 1.4" to 5.5" WC | 0.3 | 0.4 | -40° to 140° F | 45" WC | 10 PSI | 1950-5-2F |
| 3" to 11" WC | 0.4 | 0.5 | -40° to 140° F | 45" WC | 10 PSI | 1950-10-2F |
| 4" to 20" WC | 0.4 | 0.6 | -40° to 140° F | 45" WC | 10 PSI | 1950-20-2F |
| 0.5 to 2 PSID | 0.3 | 0.3 | -40° to 140° F | 35 PSI | 50 PSI | 1950P-2-2F |
| 1.5 to 8 PSID | 1.0 | 1.0 | 0° to 140° F | 35 PSI | 50 PSI | 1950P-8-2F |
| 3 to 15 PSID | 0.9 | 0.9 | 0° to 140° F | 35 PSI | 50 PSI | 1950P-15-2F |
| 15 to 50 PSID | 1 | 1.5 | 0° to 140° F | 70 PSI | 90 PSI | 1950P-50-2F |
| Measured Variable | Differential Pressure |
|---|---|
| Enclosure/Construction | IP54, NEMA 7, NEMA 9 |
| Switch Output | SPDT |
| Sensor Type | Diaphragm |
| Adjustment | External Adjustment |
| Measuring Range | 0.03" to 20" W.C. and 0.5 to 50 PSID |
