Thermocouple by error and inserting depth of the heat conduction and causes about the release date: 2019 - 06 - 12 read number: zero

Thermocouple caused by heat conduction and error, related to the insertion depth. And insert depth related to the protection tube material. Metal protection tube because of its thermal performance is good, the insert depth should be a little bit deep, ceramic material thermal insulation performance is good, can be inserted into the light. For engineering measurement, the insert depth is also related to such as the measured object is static or flowing, such as the flow of liquid or high-speed airflow temperature measurement, will not be restricted by the above, the insert depth is shallow, some concrete numerical value should be determined by experiment. Thermocouple is one of the most commonly used temperature measuring device, it directly measure temperature, and the temperature signals into a thermoelectric emfs, through electric instrument converts the temperature of the measured medium. Because the thermocouple temperature sensor has a wide measuring range, the advantages of high accuracy and fast response time, so widely used. The location of the temperature measurement points, for the production process, must be typical and representative, otherwise you will lose the meaning of measurement and control. Measured sites, thermocouple insertion direction along the length of a sensor will produce heat. When the environment temperature low heat loss. The thermocouple temperature sensor do not agree with the temperature of the measured object and produce temperature measurement error. Use the thermocouple temperature sensor in high temperature, if the medium to be measured for the gas, so protecting tube surface deposition of dust will burn melt on the surface of the thermal impedance in the protecting tube increase; If the medium to be measured is melt, slag deposition in use process, not only increase the response time of the thermocouple, and also indicate the temperature is low. Therefore, in addition to the regular verification, in order to reduce the error of sampling is often necessary. Import copper melting furnace, for example, not only install a continuous temperature measuring platinum-rhodium thermocouple temperature sensor, infrared thermometer thermocouple temperature measuring device is equipped with consumption, used for calibration of thermocouples used in continuous temperature measuring accuracy in a timely manner.