Proper operation method, a thermocouple

We are in the process of using thermocouples, there is need to pay special attention to the following five:

a, and dividing Numbers of the thermocouple, must be used and the temperature measurement and control instrument, is identical to the requirement of thermocouple; Second, the installation of the location of the thermocouple, is a principle with relatively strong electromagnetic field, but also to avoid the power the power cord, avoid temperature measuring instrument will interference signal is introduced; Three, the casing outside the thermocouple on the material selection is reasonable, not only the size of outer diameter to fit, its also pay special attention to the choice of materials, ensure that a certain strength, but also suitable for measuring the atmosphere of the environment, to make sure that the surface of the outer casing cleanliness, because its surface stains will directly cause the increase of the thermal resistance, so the temperature of the measured will certainly lower than the actual temperature; Four, and thermocouple cannot be used for a long period of time in the high temperatures allow, or it will lead to the thermocouple material change, causing the measurement error becomes larger, the low temperature is measured in, in order to effectively reduce the thermal inertia of thermocouples exist, you can use the outcrop type or touch bottom type thermocouple; Five, the outer casing of thermocouple periodically check and electrode, if discovering corrosion in a local severe, should immediately stop using, will replace thermocouple.