RTDs and thermocouples are the most commonly used temperature sensing elements for temperature sensors. The operating principle of thermocouple temperature sensor is that the two ends of the contact surface of two kinds of incompatible metals produce a weak and weak voltage when the temperature is inconsistent, and the temperature is measured by expanding the electric, which is not necessary to measure the high temperature. RTD temperature sensors work so that the resistance value changes with the temperature, and it is not necessary to measure small temperature changes. When we want to measure temperature, how to choose these two temperature sensors starts with the field of temperature measurement. RTD and thermocouple have their own suitable temperature measurement fields, and the sensor is selected according to the temperature and temperature gradient distribution environment of the actual temperature measurement point. For high temperature measurement, hot couples are selected, and hot resistance is selected for medium and low temperatures.
Secondly, it is necessary to consider the on-site electromagnetic compatibility function, and the environment of various clutter, harmonics, differential mode and common mode disturbance signals. When using a thermocouple temperature sensor, the thermoelectric potential is attributed to a weak electrical signal due to the temperature difference, which is susceptible to disturbance and then introduces measurement errors, while the RTD temperature sensor is not easy to be disturbed because it is a current signal, and because there is a three-wire system, a four-wire system, etc., which can further reduce the measurement system error, so the RTD also has a strong anti-disturbance function under the premise of satisfying the measurement field, and there is no trouble with the cold end compensation problem of the thermocouple. In addition, the RTD temperature sensor is generally connected to the transmitter at the temperature measurement point and then output to the secondary surface, which is not afraid of signal attenuation due to the length of the wire, and does not need to use the compensation wire with higher cost, while the thermocouple temperature sensor needs to use the compensation wire, which is suitable for the use of RTD in these environments. Of course, the resistance of the RTD changes with temperature rather than linearly and introduces system errors, and the thermal inertia of the RTD is slightly larger, so it cannot change quickly and dramatically at a possible better temperature. In order to avoid large system differences, the resolution of the secondary appearance of the access should not be too large.
Again, due to the simplicity of the calibration of the RTD temperature sensor, the calibration point only needs the resistance value corresponding to the zero point and 100 degrees, and the calibration equipment is simple, and the calibration time is very short. However, due to the sluggishness of heating and dewarming, the calibration of thermocouple temperature sensors is not only long, the equipment is messy, and the requirements are also very harsh. Therefore, under the premise that the temperature of the measuring medium is suitable for the use of RTD, the RTD temperature sensor should be used at the beginning
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