Thermocouple in the process of measuring error of three causes and solutions

Thermocouple is easier to appear in the process of measuring error of three causes and solving way:

one, the first is the insulation of the thermocouple effects caused by variation of measurement error, the thermocouple protection tube and wire plate severe dirt or salt slag more cases will also lead the thermocouple appeared between the electrodes and the furnace wall insulation of unhealthy phenomenon, and in the case of high temperature will be more serious, this case will not only lead to serious loss of thermoelectric potential and thermoelectric potential will be interference, and because of this kind of situation lead to serious error, can rise to baidu directly. Two, thermocouple and thermal resistance in led to measuring error, if appear on the protecting tube dust or ash is more serious, will cause the rapid increase of thermal resistance, seriously hindered the conduction of heat, so the value for this kind of circumstance temperature than need to be measured the temperature of the real value is much lower, so the effective solution is to guarantee the thermocouple protection tube cleaning. Three measurement error caused by thermal inertia, thermocouple, because of the thermocouple inert leads to instrument is slower than the measured temperature changes of the indicated value, so is to use a smaller diameter of thermocouple protection tube and thinner thermal electrode, because there are lagging phenomenon, so the measured by thermocouple temperature fluctuations than the vibration amplitude is small, effective solution is to choose those materials, thermal performance such as inner diameter smaller protection casing pipe and tube wall is thin, if it is need to be accuracy under the high temperature measurement, often choose not to protect casing bare wire thermocouple.