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[Instrumentation
and Electronics Table of Content ]
[Sensors and Transducers Suppiers Menu]
Because of changes in ambient temperature,
the resistance thermometer circuitry must be compensated. The
resistors that are used in the measuring circuitry are
selected so that their resistance will remain constant over
the range of temperature expected. Temperature compensation
is also accomplished through the design of the electronic
circuitry to compensate for ambient changes in the equipment
cabinet. It is also possible for the resistance of the
detector leads to change due to a change in ambient
temperature. To compensate for this change, three and four
wire RTD circuits are used. In this way, the same amount of
lead wire is used in both branches of the bridge circuit, and
the change in resistance will be felt on both branches,
negating the effects of the change in temperature.
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