Thermocouple temperature sensor and ad590 temperature sensor what are the similarities and differences, what are their advantages and disadvantages

One, the principle is different:

ad590 is a single-chip principle.

Thermocouple is the thermoelectric effect.

Second, different temperature measurement:

Thermocouple is divided into a good variety of graduation number, each graduation number of different temperature measurement range.

Resistance thermistors and thermocouples have appropriate temperature measurement range, according to the actual temperature measurement point of the temperature and temperature gradient distribution of discretionary choice of sensor. High-temperature measurement is usually chosen as a hot spot coupling, and medium-low temperature is chosen as a thermistor.

Three, the working principle is different:

Metal contact surface ends at different temperatures produce different weak voltage, by amplifying the circuit to measure the temperature, mainly used for measuring high temperature.

The working principle of RTD temperature sensors is that the resistance value changes with the temperature, mainly used to measure small temperature changes.

Four, ad590 temperature sensor:

Disadvantages: single function (only measuring temperature).

Advantages: temperature measurement error is small, low price, fast response time, transmission distance, small size, micro-power consumption and other advantages, suitable for long-distance temperature measurement, temperature control, do not need to carry out non-linear calibration, peripheral circuit is simple.

Fifth, thermocouple temperature sensor:

Advantages: accurate measurement, wide measurement range, anti-interference capability.

Disadvantages: the use of trouble, the cost is also higher, expensive imports, is not suitable for high-volume use.

Expanded Information:

Additional Information p>The AD590 has a supply voltage range of 4~30 V. The supply voltage varies from 4~6 V and the current IT varies by 1?A, which is equivalent to a temperature change of 1 K. The AD590 can withstand a forward voltage of 44 V and a reverse voltage of 20 V. The device can also withstand a reverse voltage of 20 V. This means that the device will not be damaged even if it is reversed. Thus the device will not be damaged by reverse connection.

When a third metal material is connected in the thermocouple circuit, as long as the temperature of the two contacts of the material is the same, the thermal potential generated by the thermocouple will remain unchanged, i.e., it is not affected by the access of the third metal to the circuit. Therefore, in the thermocouple temperature measurement, can be connected to the measuring instrument, measured thermal potential, you can know the temperature of the measured medium.

Baidu Encyclopedia-AD590

Baidu Encyclopedia-Thermocouple Sensors