Temperature sensors are used in many different fields, and due to improper operation, it is inevitable that problems will arise in one way or another. Usually this situation is rare, because each product has been strictly and carefully inspected several times before leaving the factory, and the user can also check according to the factory test report of the product. In order to ensure that the temperature sensor can be used normally and for a long time, it is necessary to pay attention to the installation, maintenance and maintenance of the temperature sensor. When installing and using the temperature sensor, pay attention to the following to ensure the best measurement effect: 1. Errors introduced by improper installation. In other words, the thermocouple should not be installed too close to the door and the heating place, and the insertion depth should be at least 8~10 times the diameter of the protective tube; Therefore, the gap between the thermocouple protective tube and the wall should be blocked by thermal insulation materials such as refractory mud or asbestos rope to avoid the convection of cold and hot air and affect the accuracy of temperature measurement; The cold end of the thermocouple is too close to the furnace body to make the temperature exceed 100°C; The installation of thermocouples should avoid strong magnetic fields and strong electric fields as much as possible, so thermocouples and power cables should not be installed in the same conduit to avoid introducing interference and causing errors; Thermocouples cannot be installed in areas where the medium to be measured rarely flows, and when measuring the temperature of the gas in the tube with thermocouples, the thermocouples must be installed in the direction of the flow velocity and in full contact with the gas. 2. Errors introduced by poor insulation. If the thermocouple is insulated, the dirt or salt slag of the protective tube and the wire plate is too much, resulting in poor insulation between the thermoelectric dipole and the furnace wall, which is more serious at high temperature, which will not only cause the loss of thermoelectric potential but also introduce interference, and the resulting error can sometimes reach hundreds of degrees. 3. Errors introduced by thermal inertia. This effect is particularly noticeable when making fast measurements due to the thermal inertness of the thermocouple, which causes the indicated value of the meter to lag behind the change in the temperature being measured. Therefore, thermocouples with thinner thermodes and smaller diameter protective tubes should be used as much as possible. When the temperature measurement environment permits, the protective tube can even be removed. Due to the measurement lag, the amplitude of the temperature fluctuation detected by the thermocouple is smaller than that of the furnace temperature fluctuation. The greater the measurement hysteresis, the smaller the amplitude of the thermocouple’s fluctuations and the greater the difference from the actual furnace temperature. When using a thermocouple with a large time constant to measure or control the temperature, although the temperature displayed by the meter fluctuates very little, the actual furnace temperature may fluctuate greatly. In order to measure the temperature accurately, thermocouples with small time constants should be selected. The time constant is inversely proportional to the heat transfer coefficient, and is directly proportional to the diameter of the thermocouple hot end, the density of the material and the specific heat. In use, materials with good thermal conductivity, thin walls and small inner diameter are usually used. In more precise temperature measurements, bare wire thermocouples without protective sleeves are used, but the thermocouples are easily damaged and should be calibrated and replaced in time.

4. Thermal resistance error. At high temperature, if there is a layer of coal ash on the protective tube and dust adheres to it, the thermal resistance increases, hindering the conduction of heat, and the temperature indication is lower than the true value of the measured temperature. Therefore, the outside of the thermocouple protection tube should be kept clean to reduce errors. Temperature Sensor Care & Maintenance: 1. If the temperature sensor is installed on a harsh site and will encounter dangerous damage such as lightning strike or overvoltage, it is recommended that the user carry out lightning protection and overvoltage protection between the distribution box or power supply and the sensor. 2. During the use of the temperature sensor, the equipment of the temperature sensor cannot be modified or changed in any way. 3. The temperature sensor is a precision instrument, so it should be handled gently and not thrown away at will, please do not use brute force when installing and unloading the temperature sensor. The temperature sensor amplification circuit is located in a stainless steel housing, which converts the sensor signal into a standard output signal, giving full play to the technical advantages of the sensor. The temperature sensor has excellent performance, anti-interference, overload, small temperature drift, high stability, and high measurement accuracy, which is an ideal temperature measuring instrument in the field of industrial automation. If you have any questions about product consultation, product customization, agency, technical inquiry, quotation, etc., please contact Xingyi: 400-600-4496!