Instrumentation

I/P Converter (Current to pressure Converter)

In this lesson, we will study I/P Converter (Current to Pressure Converter) 

  • A “current to pressure” converter (I/P) converts an analog signal (4 to 20 mA) to a proportional linear pneumatic output (3 to 15 psi or 0.2 to 1.0 Kg/cm^2).
  • Its purpose is to translate the analog output from a control system into a precise, repeatable pressure value to control pneumatic actuators/operators, pneumatic valves.
  • Two ports of air are there in an i/p converter
  • one is for air supply and another for output given to the control valve positioner.

Input (m Amp)           output(Kg/cm^2)

     4                               0.2

     8                               0.4

    12                              0.6

    16                              0.8

    20                              1.0

    This output is given to a pneumatic positioner of a control valve and from this pneumatic positioner control valve is connected.

How to calibrate an i/p converter

  • To calibrate an i/p converter following instruments are required-
  1. 4-20 Milliampere source
  2. Air Supply
  3. Air regulator for air supply
  4. Air tube(PVC tube)

The following procedure is used

  • 4 milliampere signal is given by the mill ampere source.
  • the output is checked whether it is 0.2 kg per square centimeter or not if not set the output by zero screws.
  • 20 milliampere signal is given by the mill ampere source.
  • the output is checked whether it is 1.0 kg per square centimeter or not if not set the output by span screw.

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