Environmental Concerns

FUNCTIONAL USES OF TEMPERATURE DETECTORS

Instrumentation and Control Volume 1 of 2
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Temperature Detectors FUNCTIONAL USES OF TEMPERATURE DETECTORS If the malfunction is in the circuitry and the detector itself is still functional, it may be possible to obtain temperatures by connecting an external bridge circuit to the detector. Resistance readings may then be taken and a corresponding temperature obtained from the detector calibration curves. Environmental Concerns Ambient temperature variations will affect the accuracy and reliability of temperature detection instrumentation. Variations in ambient temperature can directly affect the resistance of components in a bridge circuit and the resistance of the reference junction for a thermocouple. In addition, ambient temperature variations can affect the calibration of electric/electronic equipment. The effects of temperature variations are reduced by the design of the circuitry and by maintaining the temperature detection instrumentation in the proper environment. 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. Summary Detector Uses Summary Temperature detectors are used for: - Indication - Alarm functions - Control functions • If a temperature detector became inoperative: - A spare detector may be used (if installed) - A contact pyrometer can be used • Environmental concerns: - Ambient temperature - Humidity Rev. 0 Page 9 IC-01

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