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Cleanroom Control and Environmental Monitoring Systems
Magnehelic Differential Pressure Gauge
A mechanical low-pressure gauge with a large analog dial for continuous room, filter or duct differential indication without an external power supply.
- No Operating Power
- Large Analog Dial
- Low-Pressure Ranges
- Flush or Surface Mount
Product Introduction
The Magnehelic differential pressure gauge converts a low pressure difference into pointer movement through a diaphragm and magnetic linkage. The mechanism isolates the process air from the dial train and provides a clear zero-centered or positive scale. With no electrical power required, the gauge remains useful as an independent local indication beside electronic control or monitoring instruments. Front zero adjustment, high and low ports and flush-mount hardware support straightforward installation on cleanroom walls and filter housings.
Key Features
A large white dial and black pointer allow quick condition checks at normal viewing distance.
Diaphragm and magnetic linkage separate the pressure chamber from the pointer mechanism.
Front zero adjustment permits routine correction without opening the instrument body.
Customer Product Concerns
A local mechanical gauge is most valuable when it stays readable, stable near zero and independent of the main control system.
A power or network interruption removes the only room pressure indication.The mechanical dial continues to show differential pressure without external power.
Small scale markings make low pressure changes hard to judge.A broad circular scale spreads the selected pressure range over a large pointer arc.
Tubing direction is confused during wall installation.Clearly marked high and low ports establish the positive reference side.
The pointer no longer rests at zero after long service.A front-access zero screw permits correction with both ports at equal pressure.
Typical Applications
Local room-to-room pressure indicationHEPA filter loadingFan and duct pressureAirlock differential indication
Technical Parameters
Typical materials and dimensions for a cleanroom mechanical differential pressure gauge are listed below.
| Core Material | Silicone diaphragm with die-cast aluminum case, magnetic linkage and clear polycarbonate lens |
|---|---|
| Panel Thickness | 45-65 mm gauge body depth |
| Effective Width | 100-125 mm dial diameter |
| Maximum Length | Up to 150 mm overall body dimension with fittings |
| Steel Facing Thickness | 0 mm; die-cast aluminum instrument case |
| Core Density | 2650-2750 kg/m³ for aluminum case components |
| Thermal Conductivity | 150-220 W/(m·K) for the aluminum case |
| Surface Finish | Black or dark-gray case with white dial, black pointer and clear lens |
| Joint Type | Dual high-low pressure connections with flush-mount ring or surface bracket |
| Customization | Available based on the intended application and operating environment. |
Available Options
Positive or bidirectional scalePa or inch-water-column dialFlush or surface mountingStatic pressure tips and tubing kit
Planning a Magnehelic Differential Pressure Gauge specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
