In this section we will read about
- Current to pressure Converter (I/P Converter)
- Control Valve positioner or Pneumatic positioner
- Parts of a pneumatic control valve positioner
- Control Valve and its types
- Solenoid Valve
- Pneumatic Cylinder
- Butterfly Valve
- Globe Valve or pneumatic globe valve
- Parts of a Control Valve
- Pneumatic globe valve types
- Control Valve Characteristics
- Class of a control valve
- Pressure Transmitter
- pressure transmitter working principle
- Pin type pressure Transmitter
- Pressure Transmitter connections
- pressure transmitter signal checking
- Flow transmitter
Current to pressure Converter (I/P 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)
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 following instruments are required-
- 4-20 Milliampere source
- Air Supply
- Air regulator for air supply
- 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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