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Dwyer Instruments
Dwyer Series 1950 Explosion-Proof DP Switch
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1950: 0.07 in w.c.–50 psid class; SPDT; NEMA 3/7/9; IP54. RFQ range.
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Key parameters
Measuring range
Setpoint models from 0.07–0.15 in w.c. up through 4–20 in w.c.; 1950P models 0.5–50 psid
Accuracy
Repeatability governed by model deadband tables (see Bulletin E-57 / DS)
Output
SPDT switch (common / NO / NC screw terminals)
Process connection
1/8 in female NPT high and low pressure ports
Electrical connection
1/2 in female NPT conduit
Approvals
UL; CSA; FM; CE
Fits hazardous-location differential pressure switching where you need a Dwyer Series 1950—set-point ranges from about 0.07 in w.c. to 50 psid on air and compatible gases with SPDT output and NEMA 3/7/9 class enclosure.
Key advantages
- Ranges — About 0.07 in w.c. to 50 psid set-point class
- Medium — Air and compatible gases
- Output — SPDT (NO/NC selectable)
- Enclosure — IP54; NEMA Type 3, 7, 9 class
- Use — Explosion-proof DP switching
Typical applications
- HVAC / pressurization in classified areas.
- Filter DP alarms (gas).
- Hazardous-area fan proving.
Selection guide
- Set-point range model
- NO/NC preference
- Port orientation
Common mistakes
- Using on incompatible liquids.
- Wrong range for set-point.
- Ignoring area classification paperwork.
When to RFQ / what to tell us
- Range model.
- Quantity, ship-to.
Request a Quote · Get selection help
Specs
| Spec | Value |
|---|---|
| SKU | 37048 |
| Brand | Dwyer Instruments |
| Model | Series 1950 |
| Product type | Differential Pressure Switch |
| Type | Explosion-proof differential pressure switch (Dwyer Series 1950) |
| Range | Set-point ranges from about 0.07 in w.c. to 50 psid class |
| Medium | Air and compatible gases |
| Output | SPDT switch (NO/NC selectable) |
| Enclosure | IP54; NEMA Type 3, 7, 9 class |
Documents
FAQ
Q: Media? A: Air and compatible gases.
Q: Output? A: SPDT switch.
Q: What should I send for a quote? A: Range model, quantity, ship-to.
Links
| Parameter | Value |
|---|---|
| Measuring range | Setpoint models from 0.07–0.15 in w.c. up through 4–20 in w.c.; 1950P models 0.5–50 psid |
| Accuracy | Repeatability governed by model deadband tables (see Bulletin E-57 / DS) |
| Output | SPDT switch (common / NO / NC screw terminals) |
| Process connection | 1/8 in female NPT high and low pressure ports |
| Electrical connection | 1/2 in female NPT conduit |
| Approvals | UL; CSA; FM; CE |
| Mounting | Diaphragm in vertical position; two mounting holes on 4-7/8 in BC |
| Setpoint | External screw adjustment on housing top; approximate deadbands per model chart |
| Electrical Rating | 15 A @ 125/250/480 VAC; 1/8 HP @ 125 VAC; 1/4 HP @ 250 VAC (mica/phenolic silver) |
| Service | Air and non-combustible compatible gases only (use 1950G for combustible gases) |
| Enclosure Rating | NEMA 3 (IP54) weatherproof; NEMA 7 and 9 explosion-proof |
| Temperature Limits | −40 to 140 °F (−40 to 60 °C); model-specific limits for 1950P-8/15/25/50 and 1950-02 |
| Pressure Limits | Continuous: 1950 in-w.c. models 45 in w.c.; 1950P 35 psi (1950P-50: 70 psi); surge limits per DS |
| Weight | 3.25 lb (1.5 kg); 1950-02 about 4.4 lb (2 kg) |