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How does a Diaphragm Pressure Gauge work?

A diaphragm pressure gauge is a type of pressure measuring instrument that uses a flexible diaphragm to measure and display the pressure of a fluid or gas.The positive or negative pressure acting on the diaphragm causes the deflection of the measuring element.The magnitude of the deflection is proportional to the pressure being measured. The diaphragm pressure gauge is used to measure gases and liquids with a pressure range of 10 mbar to 60 ba. Here's how it works:

  1.  Construction: A diaphragm pressure gauge consists of a circular, flexible diaphragm made of a resilient material such as metal or elastomer. The diaphragm is typically clamped at its edges and sealed to the gauge casing, creating a closed chamber.

  2. Pressure Application: When pressure is applied to the diaphragm, it flexes or deforms due to the force exerted by the fluid or gas. The diaphragm's deflection is proportional to the pressure being measured.

  3. Linkage: The deflection of the diaphragm is transmitted to a mechanical linkage system, which amplifies the small movements of the diaphragm.

  4. Indicator: The amplified movement is then visually displayed on a dial or gauge face, typically using a pointer that rotates to indicate the pressure reading.

  5. Calibration: Diaphragm pressure gauges are calibrated to ensure accurate pressure measurement. This involves comparing the deflection of the diaphragm at different known pressure levels and marking corresponding values on the gauge face.

  6. Pressure Range: Diaphragm pressure gauges are designed to measure a specific range of pressures. They can be constructed for low-pressure applications or high-pressure applications, depending on the strength and flexibility of the diaphragm material.

Diaphragm pressure gauges are widely used in various industries, including manufacturing, process control, HVAC, and hydraulics. They offer advantages such as resistance to harsh environments, compatibility with corrosive fluids, and the ability to measure pressure differentials.

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