Position Indicators POSITION INDICATION CIRCUITRYEnvironmentalConcernsAmbient temperature variations can affect the accuracy and reliability of certain types of positionindication instrumentation. Variations in ambient temperature can directly affect the resistanceof components in the instrumentation circuitry, and, therefore, affect the calibration ofelectric/electronic equipment. The effects of temperature variations are reduced by the designof the circuitry and by maintaining the position indication instrumentation in the properenvironment, where possible.The presence of humidity will also affect most electrical equipment, especially electronicequipment. High humidity causes moisture to collect on the equipment. This moisture can causeshort circuits, grounds, and corrosion, which, in turn, may damage components. The effects dueto humidity are controlled by maintaining the equipment in the proper environment, wherepossible.SummaryThe accuracy and reliability of position indication instrumentation can be affected by ambienttemperature and humidity. The purposes of position indicator components are summarizedbelow.Position Indicator Components SummaryDetection devices provide a method to determine the position of a valve orcontrol rod.The indicating and control circuitry provides for remote indication of valve orrod position and/or various control functions.Rev. 0 Page 13 IC-05
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