Dwyer Pressure Switches (Models 1638-0, 1638-1, 1638-10, 1638-2,
1638-5)
Product Introduction
The Dwyer Pressure Switches (Series 1638) are reliable, precision
instruments designed for pressure-based control in HVAC and
industrial processes. With models covering a range of pressure
spans (e.g., 0–1 psi to 0–10 psi), these switches feature a visible
set-point indicator for easy operation and troubleshooting. The
large diaphragm design ensures accuracy in low-pressure ranges,
enabling precise control of pumps, fans, and valves. Capable of
handling current loads up to 15 amps, they directly support small
electrical loads without additional relays, simplifying system
design and reducing installation costs.
Product Features
Visible Set-Point Indicator:
Front-facing indicator allows quick visual confirmation of pressure
set points.
Simplifies on-site adjustments and troubleshooting without
specialized tools.
Large Diaphragm Design:
Enhances sensitivity and accuracy in low-pressure applications
(e.g., 0–1 psi range).
Enables precise pressure threshold detection for reliable system
control.
High Current Load Capacity:
Supports up to 15 amps, suitable for direct connection to small
motors, solenoids, and alarms.
Eliminates the need for intermediate relays, reducing component
costs and system complexity.
Versatile Pressure Ranges:
Models cover different pressure spans:
1638-0: 0–1 psi
1638-1: 0–2 psi
1638-2: 0–5 psi
1638-5: 0–10 psi
1638-10: (consult datasheet for specific range)
Rugged Construction:
Durable housing suitable for indoor HVAC and general industrial
environments.
Reliable performance in typical operating temperatures and humidity
ranges.
Technical Specifications
| Parameter | Value |
| Model Range | 1638-0, 1638-1, 1638-2, 1638-5, 1638-10 (pressure spans vary by
model) |
| Pressure Range | E.g., 1638-0: 0–1 psi; 1638-5: 0–10 psi (check model specifics) |
| Current Load | Up to 15 amps @ 125 VAC/28 VDC |
| Switch Type | SPDT (Single Pole, Double Throw) for normally open/closed
configurations |
| Wetted Materials | Corrosion-resistant components for compatibility with air and
non-corrosive gases |
| Mounting | Panel or surface mounting options |
