Thermocouple advantages, more effective. Thermocouple in the process of use the matters needing attention in the process of use should be based on thermocouple temperature measurement range and measurement of object, choosing the right of the thermocouple type, specification and maintenance of pipe materials. Thermocouple temperature and high pressure cannot surmount the numerical rating of the thermocouple. If the thermocouple to be used in the corrosive medium, made of stainless steel protecting tube should be adopted. Most of the thermocouple sensor is about 120 mm in length, select the thermocouple inserted depth, should consider to the thermocouple sensor can only measurement of full range of the measured medium uniformity degree. Thermocouple wiring, junction box opened the first, and then wiring. Connection way of general there are two wire and three-wire system two kinds. Three wire system has the advantage of cohesion, can prevent the bimetallic thermometer provoked by connecting wire resistance value of the instrument error value for show. Thermocouple appeared with the connecting wires should be insulated copper wire, shall not use the thermocouple compensating lead wires. Copper wire resistance value should be according to the rules of data matching instrument technique conditions, common for 2 - 50, dc balanced bridge wire resistance value can be used to adjust. Can't take a thermocouple with two instrument used in parallel, as long as the double branch thermocouple with appeared two instrument can only be used to apply. Thermocouple and its attachments without using, the required storage in tungsten-rhenium thermocouples are not affected by vibration and impact. Suitable for site condition for 10 to ambient temperature Around 35 gc, no greater than 80% relative humidity, air should not contain material of thermocouple parts corrosion can be formed.