Accuracy of Surface Mounted Temperature Sensors in Different Applications

摘要

Surface mounted temperature sensors have more frequently been used in districtheat metering during the last years. The accuracy of these sensors has been investigated and compared to the requirements in the Swedish regulations SPKB 1986:18. The most important parameters that influence the surface sensors and their accuracy are the efficiency of the insulation and the heat transfer from pipe to sensor. The influence on the accuracy also depends on the construction of the sensor. The dominant source of error is deficiency in the insulation of the sensor. The insulation must consequently be carefully mounted. Furthermore, it is of great importance that the mounting of the two sensors is as identical as possible so that the loss of heat to the surroundings is equal and the thermal contact with the pipe is uniform.