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Figure 4-3. Thermocouple with Reference Junction and Voltmeter
4.2 REFERENCE JUNCTION TEMPERATURE
The reference junction temperature is easiest to compensate for by measuring the
temperature of closely situated reference junctions using, for example, a resistance
temperature probe.
Figure 4-4. Reference Junction Compensation Using a Pt100 Probe
The temperature of the reference junctions can also be kept constant by cooling or
heating them with the aid of a thermostat. When cooling, 0°C is most convenient.
When heating, a temperature is selected which is somewhat hotter than room
temperature, for example, 50°C.
Figure 4-5. Reference Junction Compensation Using a Temperature Controller
L. J
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