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Thermocouple temperature transmitter advantages
Temperature transmitters include thermal resistance and thermocouples. The thermocouple temperature transmitter has the advantages of low cost, small size, simple structure and high strength, but its performance is good, so the use rate of thermocouple temperature sensor is most common in various industries. Temperature transmitter thermocouple wire length is short, if relatively short, steep temperature gradient will be such that, but in view of a conductive effect, a greater length of wire thermocouple there are its advantages, when the temperature gradient will be smaller However, the conduction loss is also reduced; however, from the negative effect of the long wire, the output voltage of the long wire thermocouple is small, which increases the burden on the subsequent signal conditioning circuit.
Thermocouple temperature transmitter voltages have voltage drops along the length of two different metals, but this does not mean that a shorter length thermocouple will certainly have a different Seebeck coefficient than a larger thermocouple. .
In addition to the small output signal, the linearity of the device needs a large amount of calibration, usually implemented in hardware and software. If it is implemented in hardware, an absolute temperature reference is needed as a cold-side reference. If it is implemented in software, then it is compared. Table or polynomial calculations to reduce thermocouple errors. Finally, electromagnetic interference couples into this two-wire system; small wire gauge wire can be used for high temperature detection and has a longer life, but if sensitivity is the most important factor, large wire gauge wire measurement performance is better.
In general, thermocouple temperature transmitters have many advantages: they have a wide range of measurable temperatures, high mechanical strength, and low price, making them the preferred choice for temperature measurement. However, thermocouple temperature transmitter has its minor drawback, if the user is very high accuracy requirements, other temperature sensors may be considered, since the thermocouple temperature transmitter to be achieved easily with high accuracy is not required.