Differential pressure gauges

What is a differential pressure gauge?

A differential pressure manometer, also known as a differential pressure gauge, measures the pressure difference between two separate pressure systems. They have two connections: one for high pressure (+) and one for low pressure (-). EMVO Techniek stocks a wide variety of differential pressure gauges, including those with Bourdon tubes and diaphragms. The best choice depends on your specific requirements and system:

• Bourdon Tube: In this mechanism, the pressure difference is measured via a Bourdon tube that deforms under the pressure difference. This deformation is transferred to a scale via a mechanical linkage. Bourdon tubes are generally robust and provide high accuracy. They have a wide temperature range, making them suitable for various temperature conditions. Differential pressure manometers with Bourdon tubes are also highly resistant to shocks and vibrations.
• Diaphragm: A diaphragm manometer uses a flexible diaphragm that deforms due to the pressure difference. This deformation is then transferred to a scale via a mechanical linkage. Diaphragm manometers often have a smaller dead volume, leading to a faster response. Their lightweight, compact design, and good chemical resistance are also significant advantages.

Applications for differential pressure gauges

Differential pressure manometers are particularly useful for monitoring the flow of liquids or gases by measuring the pressure difference across a restriction (such as a filter or nozzle). Some applications for differential pressure manometers include:

• Filter Monitoring: They can monitor the degree of clogging in a filter by measuring the pressure difference before and after the filter.
• Airflow Measurements: In HVAC systems, differential pressure manometers are used to monitor the airflow through ducts.
• Flow Control: In process installations, a differential pressure manometer can regulate the flow rate of liquids or gases.
• Hydraulic and Pneumatic Systems: They are used in hydraulic and pneumatic systems to measure the pressure difference between the inlet and outlet of valves or actuators.

Choosing the right differential pressure gauge

The choice between a differential pressure manometer with a Bourdon tube or a diaphragm depends on factors such as accuracy, response time, temperature range, and the specific requirements of your application. Feel free to contact EMVO Techniek for expert advice!