Dwyer 3005MR Photohelic Pressure Switch 25 Psi

Product Description

The DWYER 3005MR is a Photohelic pressure switch designed for monitoring and control applications where differential or gauge pressure measurement is required alongside switch action. Rated to a maximum of 25 psi with 2% accuracy, this unit combines a visual analog dial with integrated switching capability in a single compact instrument. The 4-inch dial face is housed in a polycarbonate plastic body, making it suitable for light industrial and HVAC environments. The unit weighs 1.625 pounds and connects via a 1/8-inch FNPT back or side port. Includes 8-inch cable assemblies for electrical connections. Licensed HVAC technicians and instrumentation technicians are the primary installers.

The 3005MR is used in HVAC systems, cleanrooms, filter monitoring, and general industrial pressure monitoring where both a visual gauge reading and an electrical switching output are needed at the same tap point. Its surface-mount configuration allows installation on panels, ductwork, or enclosures. The 5-inch water column range reference and a minimum vacuum rating of -20 inches Hg make it appropriate for low-differential-pressure monitoring typical of air handling and ventilation systems. The 120 degrees F maximum temperature rating suits most indoor mechanical and air-side applications.

Key Features

• 25 psi maximum pressure rating with 2% accuracy
• 4-inch dial face for easy on-site visual readings
• 1/8-inch FNPT connection, back and side entry options
• Surface-mount design for panel or ductwork installation
• Polycarbonate plastic body construction
• Includes 8-inch cable assemblies for electrical connections
• CE listed

Compatibility

Designed as an OEM-style replacement or upgrade instrument for residential and light commercial HVAC, ventilation, and industrial pressure monitoring applications requiring a combined gauge and pressure switch function.

Installation Notes

Installation is typically performed by a licensed HVAC technician or instrumentation technician. De-energize the system and isolate the pressure source before making any connections. Use appropriate thread sealant on the 1/8-inch FNPT fitting and do not overtighten the polycarbonate housing. Electrical connections should comply with applicable NEC requirements for the installation environment.