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Thermocouple Temperature Transmitters - Continued
Points of Consideration When Using Thermocouples to Measure Temperature
Thermocouples work by measuring the voltage produced by the junction of two different metals. The voltage produced is proportional to the temperature difference between the two metals, and this voltage can be measured and used to determine the temperature at the junction.
However, there are several sources of error that can affect the accuracy of thermocouple temperature measurements, including the reference junction temperature, lead wire resistance, cold junction compensation, thermal EMF, thermal conductivity, and self-heating.
It is important to consider these potential sources of error and take steps to minimize them in order to achieve accurate temperature measurements using thermocouples.
In some cases, it may be necessary to use another type of temperature sensor, such as an RTD transmitter, in order to achieve the desired accuracy.
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