Environmental Concerns – Position Indicators – Position Indication Circuitry
Ambient temperature variations can affect the accuracy and reliability of certain types of position indication instrumentation. Variations in ambient temperature can directly affect the resistance of components in the instrumentation circuitry, and, therefore, affect the calibration of electric/electronic equipment. The effects of temperature variations are reduced by the design of the circuitry and by maintaining the position indication instrumentation in the proper environment, where possible.
The presence of humidity will also affect most electrical equipment, especially electronic
equipment. High humidity causes moisture to collect on the equipment. This moisture can cause short circuits, grounds, and corrosion, which, in turn, may damage components. The effects due to humidity are controlled by maintaining the equipment in the proper environment, where possible.
Summary
The accuracy and reliability of position indication instrumentation can be affected by ambient temperature and humidity. The purposes of position indicator components are summarized below.
Position Indicator Components Summary
- Detection devices provide a method to determine the position of a valve or control rod.
- The indicating and control circuitry provides for remote indication of valve or rod position and/or various control functions.
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