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Differential Pressure Manometer: A device for measuring pressure

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Richard Wexler
Differential Pressure Manometer: A device for measuring pressure

This article discusses the differentials pressure manometer, a device for measuring pressure in a fluid. It reviews the theory of operation, construction, and application of the differential pressure manometer.


Basics

The differential pressure manometer is a device for measuring pressure. Pressure is measured by the difference in pressure between two sides of the manometer. The differential pressure manometer consists of two individual reservoirs with an inflow and outflow valve. Sensors are attached to both valves, which take in and release air respectively. These sensors provide the current differential pressure for display on a dial on the front panel. The manometer can be used to measure pressure in non-combustible environments, including air, water and vacuum. However, it is mainly used in industries where people are exposed to hazardous atmospheres.


How it Works

In a differential pressure manometer, two pressure sensors are placed in different places. One sensor is open to the atmosphere and the other is connected to a rubber diaphragm. The atmospheric pressure pushes the diaphragm up and the rubber strain gauge reads its deflection every time it compresses. A typical differential pressure manometer has a range of 0 to 15 psi or about 1 to 14.7 kPa, and it can be calibrated for pressure differences in the range of 0 to 4,000 psi or about 4.4 to 66 MPa (1 kPa = 1 newton per square meter).


The manometer is commonly used to measure the pressure within a plant or in a piping system. It can also be used to accurately measure the pressure in a harbor and to monitor changes in water level inside a warehouse. With this type of manometer, you can use it to measure the water level in cisterns, water towers and reservoirs, to determine air pressure differences within a building, and to measure the height of cranes, towers, and other structures. The manometer is usually an air-filled cylinder with a fixed volume that is sealed at both ends with a gasket. A pressure sensor, such as a transducer or strain gauge, is attached to the inside surface of the manometer and is connected to the fluid through the fixed volume. The pressure in the fluid is measured by a pressure sensor that measures the change in volume caused by changes in pressure.


Differential Pressure Manometer applications

The differential pressure manometer is a device that is used to measure high or low pressures. It can be used in many different places, such as:

-submarines,

-aircraft,

-chemical plants,

-offshore platforms and rigs,

-vacuum chambers, and

-medical equipment


Application for HVAC

Differential Pressure Manometers are used in HVAC systems to measure the pressure of the air that is being pumped into a furnace, boiler or other HVAC system. This device can be installed as a stand alone or with a controller.

 

Conclusion

A differential pressure manometer is a device for measuring the pressure of two different areas of a fluid. It consists of two sealed glass chambers connected by a tube that allows gas or liquid to flow in one down and out the other up, but not in the reverse direction. The difference in height between the two chambers is usually read by an observer inside them.


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Richard Wexler
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