सामान्यतः उपयोग किए जाने वाले टंगस्टन-रेनियम थर्मोकपल्स की तुलना

The thermoelectric potential value of tungsten-rhenium thermocouple is higher than that of platinum-rhodium thermocouple, but lower than that of nickel-chromium thermocouple. It has the widest temperature measurement range (0~2800 degree ) and is most suitable for temperature measurement in vacuum, inert and reducing atmospheres. It is not suitable for temperature measurement in oxidizing atmospheres, but it has good effect for rapid and short-term temperature measurement in oxidizing atmospheres. Special anti-oxidation measures are taken for tungsten-rhenium couple wires, and temperature can be measured continuously in oxidizing atmospheres. Its accuracy and life are comparable to those of platinum-rhodium couples. Compared with other thermocouples, tungsten-rhenium thermocouples have better comprehensive performance and can replace platinum-rhodium thermocouples for temperature measurement, so tungsten-rhenium thermocouples have the widest application range.

Sensitivity (or thermoelectric potential rate) refers to the increase (or decrease) in thermoelectric potential value for every 1 degree increase in the temperature of the temperature field. The higher the sensitivity of the thermocouple, the higher its measurement accuracy. The sensitivity of various tungsten-rhenium thermocouples in different temperature ranges is different. The sensitivity of W/W-26Re thermocouple is the highest in the medium temperature range (800~2000 degree ), and its sensitivity in other temperature ranges is lower than that of the other three tungsten-rhenium thermocouples. In the range of 400~800 degree , the sensitivity of doped W-3Re/W-25Re thermocouple is the highest; in the temperature range of 0~400 degree , the sensitivity of W-5Re/W-26Re thermocouple is the highest; when the temperature is higher than 2000 degree , the sensitivity of W/W-20Re thermocouple is the highest. The sensitivity of commonly used tungsten-rhenium thermocouples in the high temperature range (higher than 1200 degree ) decreases rapidly with the increase of temperature, which has an adverse effect on the accuracy of high temperature measurement.