Transmitter

The transmitter (transmitter) is an important part of the automatic control system. It plays a pivotal role in the field of instrumentation and industrial automation. The transmitter measures temperature, pressure, liquid level, composition and other physical quantities and converts them into a unified In addition to the standard signal, it also has a certain amplification effect.

When the signal converter is integrated with the sensor, it becomes a transmitter. According to the definition of “Encyclopedia of China”, a transmitter is a sensor whose output is a standard signal. The national standard is defined as a device that outputs a prescribed standard signal as a transmitter.

2. The working principle of the transmitter

In general, the working principle of the transmitter is that the transmitter sends a signal to the secondary instrument to display the measurement data. A device that converts physical measurement signals or ordinary electrical signals into standard electrical signal output or can be output by means of communication protocols. Generally divided into: temperature/humidity transmitter, pressure transmitter, differential pressure transmitter, liquid level transmitter, current transmitter, power transmitter, flow transmitter, weight transmitter, etc. Transmitter follows a physical law (or experimental mathematical model) to convert changes in physical quantities into standard signals such as 4-20mA. The transmitter is a converter that converts the output signal of the sensor into a signal that can be recognized by the controller. It can also convert the non-electricity input from the sensor into an electrical signal while amplifying it for remote measurement and control.

3. Transmitter wiring diagram

The wiring diagram of the transmitter is as follows:

4. The role of the transmitter

There are many types of transmitters. According to the working energy, there are pneumatic transmitters and electric transmitters; according to the measured parameters, there are differential pressure, pressure, flow, temperature, liquid level and other transmitters.
Transmitters play a pivotal role in the fields of instruments, meters and industrial automation. Unlike sensors, transmitters generally have a certain amplification effect in addition to converting non-electricity into measurable electricity.