I to P converter is nothing but an instrument that coverts current signal to air pressure signal. The current signal shall be any thing such as 4 - 20 mA, 0 - 20 mA etc. These current signals shall be an out put of any transmitters say pressure, temperature flow or level.
When the current signal is fed to the instrument, that signal is converted back to the voltage signal and fed to the valve insdie the instrument. There will be an air connection to the input of the valve which will be in a closed position. When the produced voltage is fed to the valve, the coil of the volve will get energised and opens the plunger.. This will allow the air to flow through the valveto the required location in the plant..say to an actuator of the control valve....
Generally these I/P converters are used for an feed back operation. for exambple, there is a pipe line in which you have fixed a pressure transmitter. If you want to control the flow in the pipe line based on the pressure, you need to have a control valve in the pipe line to control the flow. How?.....
In the control valve there will be an pneumatic actuator. The air flow to the actuator can be controlled by an I/P converter to control the flow. The line pressure can be detected by the pressure transmitter.According to the pressure, it will output 4 - 20 mA signal. This signal can be fed to the I/P converter to get the desired air output from the converter. This air will be supplied to the pneumatic actuator to control the flow in the pipe line.
Basically works on nozzle-flapper and magnetic coil principle here the flapper movement is control by the coil and it is position by the pressure sensor feedback/or feedback spring/bellow for some old model i/p converter .if you need to know read the instruction manual of that make contact the vendor to give u the reading material on transducer .
I/P Converters
Re: i/p converter
