The control system has been widely used in various fields of human society, and has corresponding control over various pressure transmitters, liquid level transmitters, temperature transmitters, temperature and humidity transmitters, differential pressure transmitters, soil moisture transmitters, etc. in the production process. For example, pressure transmitters, level transmitters and temperature transmitters are used in water treatment control systems.

The control system is mainly composed of four links: controller, controlled object, actuator and transmitter.

Controller: mainly including PLC, DCS, FCS and other main control systems. The most used in the bottom layer is the PLC control system, generally large and medium-sized control systems require decentralized control, centralized management of the occasion will use DCS control system, FCS system is mainly used in large systems.

Controlled object: generally refers to the control equipment or process (process, process, etc.). In the automatic control system, the controlled object in a broad sense includes specific equipment such as treatment process, motor, valve, etc.; In a narrow sense, it can be understood as the input and output parameters of each device.

Actuator: The actuator is mainly the valve actuator in the system, according to different process and process control, the controller controls the actuator through the output signal, the signal is fed back to the controller after the actuator acts, and the controller judges that the actuator has completed the specified action after receiving the feedback signal, and the control is completed at one time.

Transmitters：The transmitter is a device that converts the non-electric signal of the equipment sensor into current, voltage or digital standard signal, such as pressure, liquid level, temperature and other non-electric signals, which can be transmitted to the PLC control interface after the transmitter is converted, and finally participates in the parameter acquisition and control of the entire control system.

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