Current to pressure (I/P) converters receive an electrical current signal in a range of 4 - 20 mA and provide a corresponding pneumatic signal in a range of 3 - 15 PSI. The I/P converters are used in valve positioner, where a controller sends an electrical signal to I/P converter and the converter sends a corresponding pneumatic signal to valve positioners that control the valve.
Calibration of I/P converter:
- Air Filter Regulator
- I/P Converter
- Master Pressure gauge (For Measurement of I/P Output pressure)
- mA Source (to feed mA to I/P Converter)
First remove the module final assembly from the housing.
Position the range jumper in the Hi position for High Range
Connect air supply to the input port, which is connected through the air supply regulator.
Connect the output signal port with an accurate output indicator.
Make sure the port of the output gauge is installed with an output gauge or a threaded plug. A threaded plug is provided for units shipped without output gauges.
Apply a 4.0 mA signal (Vm = 1.0 V) and adjust the zero screw to reach the output of 3.0 psi. The output increases with the zero screw rotation in the clockwise direction.
Repeat the last two steps to verify and complete the calibration.