Overview
The Dwyer 1823-20 is a Series 1800 low differential pressure switch engineered for general industrial service. The Series 1823 low differential pressure switch combines small size and low price with 2% repeatability for all but the most demanding applications. Operating Range is 3″ to 22″ WC. This switch suits process control systems and mechanical equipment monitoring where compact footprint and reliable performance are required.
Key Features
- Set point adjustment inside the mounting stud permits mounting the switch on one side of a wall or panel with adjustment easily accessible on the opposite side.
- UL and CSA listed, and FM approved.
- SPDT Switch Output.
- Repeatability: ±2%.
- Compact Size And Repeatability Provide A High-Value Switch For Many Industrial Applications.
- Screw-Type Setpoint Adjustment.
Technical Specifications
- Operating Range: 3–22 inches water column (w.c.)
- Switch Type: Single-pole double-throw (SPDT)
- Process Connection: 1/8″ NPTF female
- Electrical Connections: 3 screw-type (common, normally open, normally closed)
- Pressure Limits: 10 PSIG continuous, 25 PSIG surge
- Electrical Rating: 15 A @ 120–480 VAC, 60 Hz
- Temperature Limits: -20 to 180°F (-28.9 to 82.2°C)
- Repeatability: ±2%
- Deadband: Approximately 0.35″ w.c. at minimum set point, 0.70″ w.c. at maximum set point
- Mounting: Panel and wall mount (diaphragm in vertical position)
- Certifications: UL, CSA, FM approved
- Weight: 0.5 lb
Typical Applications
It is used in process applications and mechanical equipment control. The Dwyer 1823-20 serves HVAC systems, compressor monitoring, filter differential pressure sensing, duct pressure regulation, and industrial equipment safety interlocks where low-range differential pressure indication is required.
Compatibility & Replacements
Compatible With
- General industrial pneumatic and air systems
- Process control equipment with 1/8″ NPT connections
- Standard 120–480 VAC electrical control circuits
- Panel-mount control cabinets and wall-mounted applications
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The Dwyer 1823-20 is available in multiple pressure range configurations; confirm your specific range requirement matches the 3-22″ w.c. specification.
Works With
- Standard electrical control relays and circuits
- Programmable logic controllers (PLCs) via relay output
- Industrial automation control systems
- HVAC building automation systems
- Pneumatic control networks with NPT port connections
