What signal does a PT100 thermistor transmit? What about the K-series thermocouples?
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What signal does a PT100 thermistor transmit? Is it a PT100 signal or a 4-20mA current signal? What kind of signal do K-series thermocouples transmit?
The PT100 thermistor transmits a resistance signal, while an integrated temperature sensor sends a 4-20mA current signal. The K-series thermocouples transmit mV signals.
Thermal resistors: RTD signals, which are all resistance-based signals. Thermocouples: TC signals, which are potential-based signals
If it is an integrated temperature sensor (thermistor or thermocouple + transmitter) that transmits a 4-20 mA signal, then a standalone thermistor transmits a resistance signal, while a thermocouple transmits a potential signal
A thermal resistor generates a resistance signal, while a thermocouple produces an MV signal. In the case of an integrated smart meter, the output can be selected; generally, a 4 to 20 MA current signal is used by default. All smart meters are combined together.
2# yyh1108: What are the typical values for this resistance signal and thermoelectric potential? Is it related to the thermoresistors and thermocouples you chose?
Yes, thermal resistors generally come in Pt100 and Cu50 types, each with its own table showing the relationship between temperature and resistance. Common types of thermocouples include K, T, S, E, J, B, etc., and each of them has its own temperature conversion table. The value of the thermoelectric potential generated by different types of thermocouples at the same temperature varies.
The PT100 thermistor transmits a resistance signal. K-type thermocouples transmit mV signals. Thermal resistors are generally of the Pt100 and Cu50 types. Thermocouples come in common types such as K, T, S, E, J, B, etc., each with its own temperature conversion table; the electromotive force generated by different types of thermocouples at the same temperature varies.
Each temperature point corresponds to a specific resistance/potential value; different models of thermoresistors/thermocouples yield different values at the same temperature
I’d like to add a few things for newcomers: the commonly used thermoresistors are platinum resistors and copper resistors, which are what we refer to as Pt100, Pt50, Pt10, and Cu50, etc. The numbers indicate the resistance value at 0 degrees; for example, Pt100 means its resistance is 100 ohms at 0 degrees. There are many other types of thermocouples, and the choice depends on the temperature being measured, with significant differences in price
PT100 is a resistance signal, while thermocouples produce MV signals; the integrated temperature variation can be set according to user requirements