Dwyer A3215 Photohelic Pressure Switch 35 Psi

Product Description

The DWYER A3215 is a Photohelic pressure switch designed for differential and gauge pressure measurement and switching in HVAC, industrial, and process control applications. It combines a visual pressure gauge with adjustable setpoint switching, allowing a single instrument to monitor pressure and trigger control outputs simultaneously. The A3215 features a 1/8 inch NPT thread connection and a maximum pressure rating of 35 psi with 2% accuracy. This instrument is typically installed by HVAC technicians, mechanical contractors, and instrumentation professionals requiring integrated pressure indication and control in one unit.

The A3215 is suited for use in commercial and industrial HVAC systems, air handling units, clean rooms, filter monitoring, and process piping where both pressure indication and switching functionality are required at a single measurement point. Its compact design and standard NPT threading make it adaptable to a wide range of panel and pipe installations. The 2% accuracy rating supports reliable setpoint control in demanding environments.

Key Features

• Maximum pressure rating of 35 psi for moderate-pressure applications
• 2% full-scale accuracy for dependable pressure indication and switch actuation
• 1/8 inch NPT thread connection for standard pipe and panel installations
• Combined analog pressure gauge and adjustable switching function in one instrument
• Compact form factor suited for panel mounting and field installations

Compatibility

Designed as an OEM-style replacement or direct-install Photohelic pressure switch for commercial and industrial HVAC, air handling, and process control systems requiring 1/8 inch NPT connections and pressure ratings up to 35 psi.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified instrumentation professional. De-energize the system and relieve all line pressure before connecting or disconnecting the instrument. Use appropriate thread sealant on the NPT connection and avoid overtightening, which can damage the port. Wiring of the switching contacts must comply with applicable NEC requirements for the installation environment.