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What is the Difference between E/P Positioner and I/P
positioner in a control valve? In which applications the
respective positioners are used in?
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Answer Posted / jccarlisle
An I/P transducer is a device which converts a current
signal (usually 4-20mA) to a pneumatic signal (pressure
depends on actuator size requirement). The pneumatic signal
goes either directly to control device (valve, damper, etc)
for operation of the device or to a positioner which
measures the amount of mechanical travel of the control
device and adjusts the input until the exact percentage of
movement called for is achieved.
An E/P is a device that integrates both devices above into
one unit.
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