Temperature transmitter is the main instrument in the temperature measurement, according to the way of measurement can be divided into two categories of contact and non-contact. Temperature transmitter in the actual use of the process, can also be used with other instrumentation supporting. There are several common methods to detect and repair the temperature transmitter after encountering faults. The main replacement method, elimination method, test method. Replacement method: a common fast and effective method, provided that there are spare parts. Exclusion method: starting from the equipment that can be determined to have no problem, and gradually exclude the good equipment, resulting in problematic equipment. Test method: using a multimeter on the suspected device resistance, voltage and other elements of the test, so as to find out the location of the fault. However, there are some precautions in the maintenance of temperature transmitters, the need for field operators to pay more attention. First of all, remember not to carry electricity to overhaul the collector, plugging and unplugging cables. Second, shall not be charged with electricity to remove, install sensors and other hardware. Third, in case of wind, rain and other weather to check whether the ground temperature field changes, and if so, timely recovery. Fourth, every day to check the sealing of the external adapter box, to see whether there is water on the box, exposed cables are not broken.