Where is the cold end of a thermocouple with an integrated temperature sensor?
Thread Content
Where is the cold end of a thermocouple with an integrated temperature sensor? Is it inside the transmitter? Then how is the temperature at the cold end determined?
The transmitter compensates for the cold junction.
It’s all integrated now. What more needs to be compensated?
The cold end is the connection point between the thermocouple and the temperature sensor.
This involves the principle of temperature variation; compensation is provided for that within it.
1. The cold terminal is located on the circuit board that experiences temperature changes. 2. When careful attention is paid to cold terminal compensation, the temperature of the cold terminal is measured using a separate temperature sensor; however, to reduce costs, some systems use just a diode for this purpose, or they make use of a temperature sensor with lower precision built into the main chip
3. Things like those secondary meters that cost only a few dozen or a hundred or so yuan – obviously, the cheaper they are, the worse the quality of their temperature compensation functions. They certainly won’t use high-precision temperature sensors; after all, it would require too much effort to implement proper temperature compensation functions in such devices. :lol
I completely agree; so a slight difference in precision results in a huge difference in price. But I would like to ask, if there is a temperature sensor that can handle only thermocouple signals and one that can handle only thermal resistor signals, which one has a higher unit price? Thermocouples require compensation, while thermal resistors do not; it seems that thermocouples have an additional component.
For tasks requiring only general precision, there are many ways to simplify the process; no special calibration or testing is needed for compensation – once the circuit board is soldered and the program is flashed, that’s it. . . Speaking purely in terms of material costs, thermal resistance temperature-sensing plates are slightly more expensive than thermocouple temperature-sensing plates, by about 0.2 to 2 yuan. . . The price might be the same for both? Or thermal couple temperature change plates – might they be more expensive due to low sales volume? I hadn’t paid attention to this matter.