Description
Dwyer 1831-1-RA-S Low Differential Pressure Switch Overview
The Dwyer 1831-1-RA-S is a low differential pressure switch engineered for reliable monitoring and protection in HVAC and building automation applications. Featuring a field-adjustable setpoint range of 2.5″ w.c. to 9″ w.c. and a maximum system pressure rating of 10 PSI, this switch is well-suited for air handling units, duct pressure monitoring, filter status detection, and fan/blower proving applications. The manual reset (RA) function ensures that the switch must be intentionally reset after a fault condition, providing an added layer of safety and accountability in critical systems.
Key Features
- Adjustable setpoint range: 2.5″ w.c. to 9″ w.c.
- Maximum operating pressure: 10 PSI
- Manual reset (RA) operation — requires deliberate reset after trip
- Type 1 indoor enclosure for protection in clean, dry environments
- SPDT switching action for versatile circuit integration
- Compact, durable construction suitable for commercial HVAC installations
- Easy field adjustment of setpoint without special tools
Specifications
- SKU / Model: 1831-1-RA-S
- Brand: Dwyer Instruments
- Setpoint Range: 2.5″ w.c. to 9″ w.c.
- Maximum Pressure: 10 PSI
- Reset Type: Manual Reset (RA)
- Enclosure Type: NEMA Type 1 (indoor, general purpose)
- Series: Dwyer 1831
Typical Applications
- Air filter differential pressure monitoring and dirty filter indication
- Supply and return fan proving in air handling units
- Duct static pressure safety cutout
- Blower and induced draft fan status verification
- Commercial HVAC building automation and controls integration
Why Choose the Dwyer 1831-1-RA-S?
Dwyer’s Series 1831 pressure switches are trusted across the HVAC industry for their accuracy, durability, and ease of installation. The manual reset feature on the 1831-1-RA-S prevents automatic restart after a pressure fault, making it ideal for safety-critical applications where operator verification is required before resuming operation. The Type 1 enclosure keeps internal components protected in standard indoor mechanical room and air handler environments.
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