Dwyer 3000MR-0 Photohelic Pressure Switch 25 Psi

Product Description

The DWYER 3000MR-0 is a Photohelic pressure switch designed for differential pressure measurement and switching applications in HVAC and industrial systems. It combines a visual pressure gauge with an adjustable switching function, allowing technicians to monitor pressure and trigger control signals at setpoints without separate instruments. The unit is rated to 25 psi maximum with 2% accuracy and features a 1/8 inch NPT thread connection. It is installed and serviced by licensed HVAC technicians, instrumentation specialists, and mechanical contractors.

The 3000MR-0 is suited for residential and light commercial HVAC applications where pressure monitoring and switch control are needed at the same point in a system. Typical installations include duct static pressure monitoring, filter differential pressure measurement, and fan or blower proving circuits. The 1/8 inch NPT port provides a standard connection compatible with common instrument tubing and fittings used in these systems.

Key Features

• 25 psi maximum operating pressure for versatile instrumentation use
• 2% accuracy for reliable pressure measurement and switching setpoints
• 1/8 inch NPT thread connection for standard instrument installations
• Combines analog pressure gauge display with integrated switching function
• Compact design suitable for panel or field-mounted installations

Compatibility

Designed as an OEM-style replacement or direct-install Photohelic pressure switch for HVAC and industrial differential pressure control applications with 1/8 inch NPT porting.

Installation Notes

Installation should be performed by a qualified HVAC technician or instrumentation technician. De-energize and depressurize the system before connecting or disconnecting any pressure lines or electrical wiring. Ensure the process pressure does not exceed the 25 psi rated maximum. Follow applicable mechanical and electrical codes, including NEC requirements for any switch wiring connections.