Description
Dwyer 3300MR-0 Photohelic® Pressure Switch/Gage Overview
The Dwyer 3300MR-0 Photohelic® Pressure Switch/Gage is a precision dual-function instrument that combines accurate differential pressure indication with integrated switching capability in a single, compact unit. Designed for use with air and non-combustible gases, this instrument is an ideal solution for HVAC system monitoring, filter status indication, fan and blower pressure verification, and clean room applications where both visual readout and automatic control are required.
Key Features
- Dual-function design: combines a differential pressure gage and adjustable pressure switch in one instrument
- Pressure range: -0.25 to 0.25 in. w.c. — ideal for low differential pressure measurement applications
- Compatible with air and non-combustible gases
- 1/8″ Female NPT process connections for easy installation into existing piping or duct systems
- Large 4″ dial face for clear, at-a-glance pressure readings
- Photohelic® technology provides reliable, repeatable switching without mechanical contact wear
- Adjustable high and low set points for flexible control and alarm configurations
- Compact, panel-mount-ready design suitable for a wide range of HVAC and industrial environments
Specifications
- Model: 3300MR-0
- Pressure Range: -0.25 to 0.25 in. w.c.
- Media: Air and Non-Combustible Gases
- Process Connection: 1/8″ Female NPT
- Dial Face Size: 4″
- Brand: Dwyer Instruments
Applications
- HVAC air filter monitoring and replacement alerts
- Fan and blower differential pressure verification
- Clean room and laboratory pressure control
- Duct static pressure monitoring
- Building automation and control systems
Why Choose the Dwyer 3300MR-0?
Dwyer’s Photohelic® series is a trusted standard in the HVAC and industrial instrumentation industries. The 3300MR-0 eliminates the need for separate gages and switches, reducing installation complexity and cost. Its non-contact switching mechanism ensures long service life and consistent performance, making it a reliable choice for both new installations and system upgrades.
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