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Principle of pressure transmitter

The principle of a pressure transmitter is based on the transmission and transformation of force to achieve pressure measurement and conversion. Here is a basic explanation of the working principle of a pressure transmitter in English:

The pressure transmitter utilizes a sensing element, typically a piezoresistive or capacitive sensor, to convert the physical pressure parameter of a gas or liquid into a resistance value or capacitance value. The sensing element is responsible for detecting the pressure and converting it into an electrical signal.

The transmitter, which is the core component of the pressure transmitter, converts the resistance value or capacitance value from the sensing element into a standardized current signal or voltage signal. This conversion is achieved through the use of a bridge circuit or capacitive transmitter. A bridge transmitter outputs a current signal by adjusting the resistance values within the circuit, while a capacitive transmitter outputs a voltage signal by adjusting the capacitance values.

The circuitry serves as the control and processing unit of the pressure transmitter. It performs tasks such as signal amplification, filtering, and linearization, according to specific requirements. The circuitry also allows for the adjustment and calibration of the output signal based on user requirements.

When the pressure of the measured medium acts on the sensing element of the pressure transmitter, the sensing element generates a corresponding change in resistance value or capacitance value. This change is transmitted to the transmitter, which converts it into a standardized current signal or voltage signal for output. The output signal can then be received and processed by secondary instruments, such as indicators, alarms, recorders, or controllers, for purposes like pressure measurement, indication, and process regulation.

Overall, the pressure transmitter realizes remote monitoring and control of pressure by converting physical pressure parameters into standard electrical signals. It is widely used in various industrial automation environments.