The error of the thermocouple is what

Thermocouples exist error can be thermal resistance, thermal inertia, insulation deterioration and caused by improper installation, the following temperature sensor manufacturers to introduce you to one by one to

thermocouple fundamental error: error is intrinsic to the thermocouple, also includes a standard transmission error. Solution: to adopt the method of verification check to

the control in the range of the allowable deviation can also be used in actual temperature measuring thermocouple bias modification, the true temperature.

thermocouple material error caused by the inhomogeneity of the error and the material about the changes in temperature, the greater the more uneven the hot electrode each point temperature difference is bigger.

the effects of material inhomogeneity. Solution: annealing method are available it is abate, but can not completely eliminate.

the error of the measuring instrument: the size of the error is determined by the instrument accuracy level.

the solution: should be inspected regularly effect, to ensure the accuracy of the instrument rating.

dynamic error: after the temperature change, thermometer table to immediately pointed out that the changed temperature, thus cause the reading error. Thermocouple time constant is to determine the size of the

the main factors of dynamic error size.

the solution: to fast changes in temperature, due to thermal 憜 temperature measuring element, the dynamic error can be large, small used thermocouple or selecting the sampling rate must be used

high instrument to solve. USES the material with good thermal property protection tube, tube wall is thin, inner diameter is smaller. Reduce the protecting tube with the thermocouple measurement between the air between the

gap. Increase in measuring the velocity of the medium and accelerate the convection heat transfer.

the error due to defective insulation: thermocouple when using two thermoelectric electrode and between them and the earth shall have good insulation, otherwise there will be a thermoelectric potential losses, directly

affect the accuracy of the measurement results, seriously will affect the normal operation of the instrument.