Magnehelic Gauge Supplier in Ahmedabad and Gujarat

CPI Technology Private Limited is a dependable Magnehelic Gauge Supplier in Ahmedabad and Gujarat, offering low differential pressure gauges for cleanrooms, HVAC systems, air-handling units, filtration systems, laboratories and industrial ventilation applications.

The instrument is designed to provide clear local indication of small pressure differences in air and compatible non-corrosive gas systems. It can be used for measuring positive pressure, negative pressure or differential pressure between two connected points.

Based in Ahmedabad, CPI Technology supplies differential pressure measurement instruments to pharmaceutical companies, cleanroom contractors, HVAC consultants, hospitals, laboratories, OEMs, engineering companies, system integrators and industrial plants across Gujarat and PAN India.

What Is a Magnehelic-Type Differential Pressure Gauge?

A Magnehelic-type gauge is a mechanical instrument used for measuring low differential pressure. It contains separate high-pressure and low-pressure connections. The pressure difference acting across the sensing mechanism is converted into pointer movement and displayed on a large analogue dial.

The instrument does not require an external electrical power supply for normal local indication. This makes it suitable for continuous visual monitoring at cleanroom entrances, AHU panels, filter housings, ventilation ducts and other industrial installations.

Unlike a conventional pressure gauge used for higher process pressures, this instrument is designed to display relatively small pressure differences. Correct selection of the measuring range is therefore essential for obtaining a clear and useful reading.

Technical Specification

The following specification represents a typical low differential pressure gauge configuration. Final specifications must be confirmed according to the selected make, model, pressure range and application.

For genuine Dwyer Series 2000 models, the manufacturer specifies a 4-inch dial, 1/8-inch female NPT high- and low-pressure connections, vertical diaphragm mounting, IP67 enclosure and model-dependent accuracy. The standard 0–60 Pa range has different accuracy from many higher-range models, so the exact model datasheet must be referenced before publishing a fixed accuracy value.

Key Features

• Clear analogue display for convenient local monitoring
• Measures low positive, negative and differential pressure
• No external power supply required for mechanical operation
• Separate high- and low-pressure connections
• Suitable for wall, panel or equipment mounting
• Multiple pressure ranges and measuring units available
• Useful for cleanroom, HVAC and filter-monitoring applications

Magnehelic Gauge for Cleanroom Applications

Cleanrooms and controlled manufacturing areas often require a defined pressure difference between adjoining spaces. Depending on the facility design, the production area may be maintained at a higher or lower pressure than the corridor, airlock or surrounding room.

A differential pressure gauge can be installed between these areas to provide continuous local indication. Operators can observe the dial during routine inspections and identify whether the room pressure is within the operating limit established by the facility.

Typical cleanroom installations include:

• Pharmaceutical manufacturing rooms
• Airlocks and change rooms
• Quality-control laboratories
• Sterile processing areas
• Hospital isolation rooms
• Research and testing facilities

The gauge only displays the pressure difference. It does not automatically regulate the room pressure. Pressure control is normally performed through the HVAC or building management system.

AHU and Filter Pressure-Drop Monitoring

A common application of a Magnehelic-type gauge is monitoring pressure drop across an air filter. One sensing line is connected before the filter and the other is connected after the filter.

As dust and particles collect on the filter surface, airflow resistance may increase. The resulting change in differential pressure can be observed on the gauge dial. This provides maintenance personnel with a convenient indication of filter condition.

The instrument may be used with:

• AHU pre-filters
• Fine filters
• HEPA filter installations
• Ventilation systems
• Dust-collection equipment
• Industrial air-cleaning systems

Filter replacement limits should always be determined from the filter manufacturer’s instructions, system design and approved maintenance procedure.

HVAC and Ventilation Applications

CPI Technology supplies low differential pressure gauges for HVAC contractors, cleanroom manufacturers, system integrators and facility-management companies in Ahmedabad and across Gujarat.

The gauges may be used for fan-pressure indication, duct-pressure monitoring, blower vacuum monitoring, filter resistance and room-pressure measurement. Genuine Series 2000 Magnehelic gauges are designed for air and compatible non-combustible or non-corrosive gases, depending on the selected configuration.

How to Select the Correct Gauge

Range selection has a direct effect on readability. A range that is much higher than the actual operating pressure may make small pressure changes difficult to observe. A range that is too low may not safely accommodate the maximum expected differential pressure.

Customers should provide:

• Minimum, normal and maximum differential pressure
• Required unit such as Pa, mmWC or inch WC
• Cleanroom, filter, AHU or duct application
• Positive, negative or differential measurement requirement
• Surface or panel mounting preference
• Required quantity and delivery location

For replacement enquiries, customers can share a clear photograph of the existing dial, model number, measuring range, pressure connections and installation arrangement.

Gauge versus Differential Pressure Transmitter

A mechanical differential pressure gauge provides local visual indication. It is useful where an operator can inspect the gauge directly at the installation location.

A differential pressure transmitter converts the measured pressure into an electrical output, such as 4–20 mA, for connection to a PLC, controller, display, recorder or building management system.

A transmitter may be more appropriate when the reading must be:

• Viewed remotely
• Recorded continuously
• Connected to an alarm
• Integrated with an automation system

Some installations use both a local gauge and a differential pressure transmitter.

Installation Guidelines

The greater pressure source must be connected to the high-pressure port, while the lower pressure source must be connected to the low-pressure port. Unused pressure ports should be sealed according to the manufacturer’s instructions.

The gauge should normally be mounted vertically because standard mechanical units are calibrated in that orientation. Pressure tubing must be free from leakage, blockage, sharp bends and accidental compression. Genuine Series 2000 installation instructions also recommend locating the gauge away from excessive vibration, extreme temperature and direct sunlight.

Why Choose CPI Technology?

CPI Technology Private Limited has operated in the industrial process instrumentation sector since 2007. As a Magnehelic Gauge Supplier in Ahmedabad and Gujarat, we support individual replacement requirements, cleanroom projects, HVAC installations, OEM orders and bulk industrial procurement.

We also supply differential pressure gauges, digital differential pressure gauges, pressure transmitters, differential pressure transmitters, temperature instruments, flow meters, level instruments and calibration equipment.

Request a Quotation

Contact CPI Technology Private Limited for a Magnehelic-type differential pressure gauge suitable for your cleanroom, HVAC, AHU or filtration application.

Share the required measuring range, pressure unit, mounting arrangement, quantity and delivery location. Our Ahmedabad team will review the requirement and provide the available technical and commercial details.

Frequently Asked Questions

1. What does a Magnehelic gauge measure?

It measures low positive, negative or differential pressure in air and compatible gas applications.

2. Can it be used for cleanroom monitoring?

Yes. A correctly selected gauge can display the pressure difference between a cleanroom and an adjoining corridor, airlock or controlled area.

3. Does the gauge require electricity?

A standard mechanical differential pressure gauge does not require an external electrical power supply for local indication.

4. Can it monitor an AHU filter?

Yes. It can be connected across an air filter to indicate the pressure difference between the upstream and downstream sides.

5. What information is needed for a quotation?

Provide the pressure range, measuring unit, application, mounting type, required quantity and delivery location.