1. The structure and size of the thermocouple. The thicker the diameter of the thermode and the maintenance tube, the greater the laziness; the thicker the tube wall, the greater the laziness. In this way, the longer the thermocouple reaches stability, the longer the response time. 2. Different materials have different thermal conductivity. For example, the metal protection tube conducts heat better than the porcelain protection tube, the heat is less lazy, and the time for the thermocouple to reach stability is shorter, that is, the response time is short. 3. The response time is also different with the change of the working conditions, that is to say, the response time of the thermocouple with the same structure is different under different heat exchange conditions. When the temperature shows a step change, the time required for the output of the thermocouple to change to a certain regular percentage of the step change is called the thermal response time of the thermocouple, usually indicated by T. 2. The temperature range of the two sensors is different. The thermal resistance usually checks the temperature range of 0-150 degrees, and the maximum measurement range can reach about 600 degrees (of course, it can check the negative temperature). 3. From the point of view of material, thermal resistance is a kind of metal material, which has a temperature-sensitive change of metal material, and thermocouple is a bimetal material, that is, two different metals, due to the change of temperature, in two different metal wires There is a potential difference between the two ends. 4. The input modules of the thermal resistance and the thermocouple corresponding to the PLC are also different. This sentence is no problem, but usually the PLC is directly connected to the 4-20ma signal, and the thermal resistance and the thermocouple usually have a transmitter. Only connected to the PLC. If you connect to DCS, you don't need to use a transmitter! Thermal resistance is RTD signal, thermocouple is TC signal! 5. PLC also has thermal resistance module and thermocouple module, which can directly input resistance and galvanic signals. 6. Thermocouples are of J, T, N, K, S and other types. Rosemount temperature transmitters are more expensive than resistance, and some are cheaper than resistance, but including compensation wires, the cost of thermocouples is high.
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