The method of the pressure transmitter to control the regulating valve

Shanghai Ruicheng Electronic Instrument Co., Ltd. said that now there are fewer and fewer pneumatic products in the industrial control industry, only a large number of pneumatic control valves are used, and pneumatic transmitters and pneumatic measuring instruments are only used in special circumstances, such as high temperature. Now all the controllers of the opportunity are instruments with electrical signals, most of which are highly integrated control systems. In this case, the signals of the barometric pressure sensors used in the field are not accepted and processed by the control system, but the barometric standard signals of the field are converted. for electrical signals. This is often referred to as a pressure transmitter. The control electrical signal output from the same control room is also converted into an air signal by the instrument on site and received by the air pressure regulating valve. We usually call it electrical converter, solenoid valve positioner. Then, the editor of Shanghai Ruicheng Electronic Instrument Co., Ltd. will briefly introduce two methods for the pressure transmitter to control the pneumatic control valve, hoping to help you. Method 1: For example, in our factory, the air target flowmeter has been used in the measurement of high temperature medium. Its output is an air signal of 20-100KPa, which is converted into a current signal of 4~20ma through a pressure transmitter and sent to the DCS in the control room. The 4~20ma signal of the control valve that is processed and output is sent to the air control valve side of the field through the cable, and the solenoid valve is used through the electric converter installed on the control valve. Method 2: Adjust with a PID regulator. In fact, it is the same as the electrical signal. Select the air positioner in the positioner of the regulating valve, and convert the control signal (kPa level of low pressure) at the output of the regulator into a high pressure signal (MPa level) that can drive the valve. The above is the article introduced by the editor of Shanghai Ruicheng Electronic Instrument Co., Ltd. If you have any needs in this regard, you can contact us.