Overview
The Dwyer 2-5040 Minihelic II gauge is a compact dial-type differential pressure gage designed for low-pressure applications requiring reliable, cost-effective measurement. This model measures 0–40 inches of water column (W.C.) and operates safely at total pressures up to 30 psig. The unit combines simple operation, minimal footprint, and field-proven durability across HVAC, filtration, and OEM applications.
Key Features
- Built-in overpressure protection via blow-out membrane prevents damage during accidental over-ranging
- Removable lens and rear housing enable tool-free servicing at minimal cost
- Jewel bearing support provides friction-free helix motion and consistent pointer response
- Zero adjustment screw behind lens eliminates tampering and drift
- Glass-filled nylon housing with acrylic lens withstands rough use and temperature swings
- Standard barbed fittings for 3/16″ ID tubing; optional 1/8″ male NPT available
Technical Specifications
- Pressure Range: 0–40″ W.C. (0–100 mm W.C.)
- Accuracy: ±5% of full scale at 70°F (21.1°C)
- Maximum Operating Pressure: 30 psig (2.067 bar) continuous to either connection
- Temperature Limits: 20–120°F (−6.67–48.9°C)
- Dial Face Diameter: 2-1/16″ (52.39 mm)
- Housing Material: Glass-filled nylon; polycarbonate lens
- Weight: 6 oz (170.1 g)
- Process Connections: Barbed (3/16″ ID tubing, standard); 1/8″ male NPT (optional)
- Mounting: Panel mount, 2-5/8″ diameter hole; diaphragm in vertical position (standard)
- Media: Clean dry air and compatible inert gases
- Certifications: RoHS II compliant (EU Directive 2011/65/EU)
- Series: 2-5000
Typical Applications
- Filter Monitoring: Air filter status on compressors, ventilators, engines, and air-handling units
- OEM Integration: Cabinet air purging, medical respiratory equipment, laminar flow hoods, electronic cooling systems
- HVAC Systems: Duct pressure measurement, equipment performance verification
- Industrial Process Control: Low-pressure gas flow and vacuum measurement in non-corrosive environments
Compatibility & Replacements
Compatible With
- Clean dry air and inert gas applications (nitrogen, helium)
- Non-corrosive HVAC and mechanical systems
- Panel-mounted low-pressure monitoring installations
- Systems operating at continuous pressures up to 30 psig
Replaces / Drop-In Replacement For
- Other Dwyer Minihelic II 0–40″ W.C. units (model 2-5040)
- Legacy low-cost differential pressure gauges in comparable pressure ranges
Works With
- 3/16″ ID tubing for standard barbed connections
- 1/8″ male NPT connections (when ordered with optional fittings)
- Manual or automated monitoring systems that use dial-type analog readouts
- Systems requiring no electrical power or signal conversion
