VARIABLE OUTPUT DEVICESPosition IndicatorsSummaryVariable output position indicators are summarized below.Variable Position Indicator SummaryPotentiometer valve position indicators use an extension which is physicallyattached to a variable resistor. As the extension moves up or down, theresistance of the attached circuit changes, changing the amount of current flowin the circuit.An LVDT uses the extension shaft or control rod as a movable core of atransformer. Moving the extension between the primary and secondary windingsof a transformer causes the inductance between the two windings to vary, therebyvarying the output voltage proportional to the position of the valve or control rodextension.IC-05 Page 10 Rev. 0
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