In industrial process control, measurement and transmission unit, actuator, and regulator are the three major components of the entire control system. Among them, the measurement and transmission unit is the transmitter, and sometimes the transmitter is actually equivalent to the sensor, and the actuator is like a valve, and the regulator is the controller, which is the brain of the entire control system.
Transformation-refers to the process of transforming various physical quantities from sensors into electrical signals. For example: using thermocouples to convert temperature into electric potential; using current transformers to convert large currents into small currents. Since electrical signals are the easiest to process, modern transmitters convert various physical signals into electrical signals.
Transmission-refers to the conversion of various electrical signals that have been turned into, in order to facilitate the reception and transmission of other instruments or control devices, once again through electronic circuits to unify the electrical signals from the sensors (such as 4-20MA). The method is achieved through multiple operational amplifiers.
For example, MRC-PT-100 is a current transformer that converts the output current of a current transformer into a standard 4-20MA current transmitter; another example: MRC-TT-100, which can convert the weight signal from the temperature sensor As a standard 4-20MA weight transmitter.