This system scheme is now widely used in liquid level measurement. Liquid level measurement sensors such as liquid level transmitter, ultrasonic level gauge and magnetic flap level gauge can meet the requirements of liquid level measurement and monitoring in different occasions and media.

The pressure transmitter outputs the signal to the intelligent PID regulator, and the user can set the pressure value to be adjusted in the PID regulator as required. The PID regulator will compare the pressure value measured by the pressure transmitter with the pressure value set by the user, and automatically output the signal to control the opening of the valve until the pipeline pressure reaches the user's set value, so as to achieve constant pressure control.

The system scheme is widely used in the measurement of superheated and saturated steam; In the food and pharmaceutical industries, Duoyuan brand steam flowmeter is most widely used to measure steam produced or purchased.