Dwyer 1823-20 Low Differential Pressure Switch, 3″ to 22″ w.c.

Description

Dwyer 1823-20 Low Differential Pressure Switch Overview

The Dwyer 1823-20 is a reliable low differential pressure switch engineered for monitoring air and non-combustible gas systems in commercial and industrial HVAC applications. With a wide setpoint range of 3″ w.c. to 22″ w.c., this switch delivers accurate, repeatable performance for filter monitoring, fan proving, airflow verification, and duct pressure control.

Key Features

• Setpoint range: 3″ w.c. to 22″ w.c. (inches water column)
• Approximate deadband: 0.35 to 0.70″ w.c. for stable switching performance
• Compatible media: Air and non-combustible gases
• Maximum pressure limit: 10 PSIG
• Port connection: 1/8″ Female NPT for easy field installation
• Designed for low differential pressure sensing in HVAC duct and air-handling systems

Application & Benefits

The Dwyer 1823-20 is ideal for a broad range of HVAC and building automation applications where monitoring differential pressure across filters, coils, or fans is critical. Its 1/8″ Female NPT connection simplifies integration into existing piping or tubing arrangements, while the 10 PSIG pressure limit ensures safe operation in typical air-side systems. The adjustable setpoint across the 3–22″ w.c. range makes this switch versatile enough to serve multiple system configurations with a single part number.

Specifications

• SKU: 1823-20
• Brand: Dwyer
• Setpoint Range: 3″ w.c. to 22″ w.c.
• Approximate Deadband: 0.35–0.70″ w.c.
• Compatible Media: Air and non-combustible gases
• Pressure Limit: 10 PSIG
• Port Connection: 1/8″ Female NPT