Differential pressure transmitter is an instrument commonly used in the field of industrial automation control, its main function is to measure the pressure difference between two points in the control system, and then convert the pressure difference into a standard electrical signal output, so as to realize the automatic control of the control system.
A differential pressure transmitter usually consists of two parts: a pressure sensor and a signal processing circuit.
The pressure sensor is responsible for converting the pressure signal of the two measured points into an electrical signal, and the signal processing circuit amplifizes, linearizes, filters and processes the voltage signal, and finally outputs a standard electrical signal proportional to the pressure difference, such as a 4-20mA DC signal or a 0-10V DC signal.
Specifically, when there is a pressure difference in the control system, the differential pressure transmitter senses this pressure difference and converts it into a voltage signal through a pressure sensor.
Pressure sensors generally use a principle called piezoresistive effect, that is, by placing a small elastic structure (such as silicon wafer, metal film, etc.) in the sensor, when the pressure acts on this structure, its deformation will cause a change in resistance, so as to obtain a resistance value proportional to the pressure.
This resistance value is then read by the signal processing circuit and converted into a corresponding electrical signal output.
Thanks to this operating principle, the differential pressure transmitter is able to accurately measure the pressure difference in the control system and convert it into a standard electrical signal output.
This output signal can be directly read by PLC (programmable logic controller) and other control equipment, and is used to control the action of actuators (such as electric valves, frequency converters, etc.), so as to realize the automatic control of the control system.
In addition to the above basic operating principles, differential pressure transmitters have a number of other features and functions.
It has high measurement accuracy and stability, and can meet the measurement needs under different working conditions.
It is small in size, lighter in weight, and relatively easy to install and maintain.
The differential pressure transmitter also has the characteristics of strong anti-interference and corrosion resistance, and can adapt to harsh industrial environments.
To sum up, the differential pressure transmitter realizes the automatic control of the controlled system by converting the pressure difference in the control system into an electrical signal output, and improves the efficiency and quality of industrial production.
It is widely used in industrial fields, such as chemical, electric power, petroleum, water treatment and other industries, providing reliable technical support for the monitoring and control of various processes.