4.Pressure Measurement-Capacitance Type

 

Pressure Measurement-Capacitance Type

A capacitance pressure transmitter is a type of pressure sensor that convert applied pressure to electrical signal. It measure’s the pressure by changing in capacitance.

 

Capacitance is the ability of a system to store electrical charge. In a capacitance pressure transmitter, a thin diaphragm made of a conductive material, such as stainless steel, is placed between two electrodes. The diaphragm and electrodes form a capacitor, and the capacitance between the two electrodes changes as the diaphragm moves in response to changes in pressure.

 

Generally, the capacitance is defined by the equation:

C = Aε/d

C – Capacitance between two conductor

A – Area of overlapping between those conductors

d – Distance separating the conductors

ε – Dielectric constant of insulating medium

 

The capacitance pressure transmitter works by measuring the changes in capacitance and converting it into an electrical signal that corresponds to the pressure being measured. This signal is then transmitted to a device, such as a computer or control system, for further processing and analysis.

 

Capacitance pressure transmitters are commonly used in industrial and process control applications, such as measuring the pressure in pipelines, tanks, and vessels. They offer high accuracy and reliability, as well as resistance to temperature and environmental changes.





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