1, thermocouple is a sensor for measuring temperature, which is made by welding two wires of different metals. When heating, there will be a slight voltage difference, and the temperature can be determined by measuring this voltage difference. Rosemount is widely used for temperature measurement in high temperature, low temperature and extreme environment.

2.TT is the abbreviation of thermometer, which is an instrument to measure the temperature by measuring the thermal motion or radiation of an object. TT is used for indoor and low-temperature temperature measurement, such as measuring the temperature of laboratories, hospitals, refrigeration and freezing equipment.