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Thermocouple Temperature Transmitters - Continued
Points of Consideration When Using Thermocouples to Measure Temperature
Thermocouples work by the temperature difference between one end of a conductor and the other end that produces the small electromotive force (emf), or charge imbalance, that leads us to the temperature difference across the conductor.
OK, simple enough, but how do you actually measure this emf in order to discern its relationship to temperature?
Read Temperature Measurement Using Thermocouples Industry Technology Paper for more detailed information.
Since accuracy will ultimately play a significant role in selecting a sensor type, we should be familiar with potential sources of error when making temperature measurements with thermocouples. Some of these considerations may steer us from one T/C type to another, or perhaps to another sensor type, like RTD transmitters for example.
12 Points to Consider When Using Temperature Thermocouple Transmitters
- Thermocouple Sensor Inaccuracy
- Thermocouple Sensor Non-Linearity
- Thermocouple Sensor Sensitivity
- Sensor Drift, Aging, and De-Calibration
- Choice of Extension Wire
- Response Time
- Cold Junction Compensation
- Connection Problems
- Thermal Shunting and Immersion Error
- Lead Resistance
- Common-Mode Voltage