- Pressure Connection Type: 1/8 in FNPT
- Pressure Limits: 10 psig (68.95 kPa) continuous, 25 psig (172.4 kPa) surge.
- Temperature Limits: -30 to 110°F (-34.4 to 43.3°C).
Specifications
| Part Number | 1638-5 |
| Brand | Dwyer Instruments |
| Action | Standard |
| Contact Form | SPDT |
| Pressure Connection Type | 1/8 in FNPT |
| Range | 2.0-6.0″ w.c. |
| Factory On Setting | 2″wc |
| Item | Pressure Switch |
| Factory Off Setting | 6″wc |
| Standards | CSA, FM, UL |
| Features | Visible set point indicator simplifies operation and trouble shooting; Large diaphragm provides low range accuracy providing precise control; Current loads of up to 15 amps supports most small electrical loads supporting a broader range of HVAC and Process applications without the need for additional relays and components |
| Agency Approvals | CSA, FM, UL. |
| Switch Type | SPDT. |
| Process Connections | 1/8″ female NPT. |
| Pressure Limits | 10 psig (68.95 kPa) continuous, 25 psig (172.4 kPa) surge. |
| Repeatability | ±1%. |
| Mounting Orientation | Diaphragm in vertical position. Consult factory for other position orientations. |
| Service | Air and non-combustible, compatible gases. |
| Temperature Limits | -30 to 110°F (-34.4 to 43.3°C). |
| Set Point Adjustment | Screw type with enclosed scale. |
The Dwyer Instruments 1638-5 is a standard pressure switch with SPDT contacts. This type of switch actuates an electrical circuit based on a change in system pressure, with a set point range of 2.0 to 6.0 in H2O. It features a visible set point indicator, a large diaphragm for low range accuracy, and supports current loads up to 15 amps. The switch is CSA, FM, and UL listed, with 1/8 in FNPT process connections and pressure limits of 10 psig continuous and 25 psig surge.
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