In order to accurately measure and control the workpiece and the cooling medium temperature heat treatment, the need to measure the temperature control instrumentation, temperature measurement and temperature.

A. Glass liquid thermometer

Glass liquid thermometers (mercury, alcohol, toluene, etc.) according to the liquid medium in the glass tube, heat expansion of the principle of temperature measurement, temperature measurement range: -100 ° C ~~ 800 ° C. The characteristics of the glass liquid thermometer is to place instructions, accurate and convenient, live contact can be equipped with relays letter or control.

Two. Thermocouple and millivoltmeter

The thermocouple is composed of two ingredients wire or alloy wire, welded to one end inserted into the furnace (hot side), separated from the other end (cold side), connected with a wire and millivoltmeter. The temperature difference between the cold end when the hot end is heated and the cold end of the potential difference between the two lines with the temperature scale of the millivoltmeter pointer deflection directions temperature. Temperature difference is greater the greater the potential difference indicate that the temperature will also increase accordingly.

The millivoltmeter measurement of body a Magnetoelectric header, bearing Zhang wire, moving coil in a fixed permanent magnetic field.
 
Thermocouple millivolt signal generated by the movable current through the coil by the magnetic field and rotation. Zhang wire torques and dynamic torque balance, the size of the dynamic position and millivolt signal corresponding to the pointer on the dial that the corresponding temperature. Millivoltmeter scale surface is marked with the use of thermocouple number only of a specification of the millivoltmeter and the corresponding sub-degree No. thermocouples used in conjunction.

Thermocouple pyrometer and a combination of automatic temperature control equipment up automatically control the furnace temperature. In accordance with the process set the workpiece heating temperature before use, when the furnace temperature below the set temperature automatically power for heating; cut off the power to stop automatically when the furnace temperature is higher than the set temperature after heating; furnace temperature decreased less than the set temperature, then heated to re-power to ensure the uniformity of the furnace temperature. Thermocouple pyrometer available for the determination of 0 ° C ~~ gas or liquid within the scope of the 2000 ℃ temperature.
3. Optical pyrometer

The optical pyrometer is the use of objects in monochromatic wave radiation intensity (ie, monochrome brightness) temperature with the principle of temperature change. Even change the brightness of the optical pyrometer filament, it the same as the measured object monochrome brightness optical pyrometer on the dial that indicates the brightness temperature of the object. The optical pyrometer is in accordance with the absolute blackbody temperature points, measuring the temperature of the general objects, the reading on the dial must be the object of the monochrome the radiation coefficient (ελ,) be amended in order to obtain the true temperature of the measured object .

Optical pyrometer with a simple structure, easy to use and non-contact measurement of body temperature. However, due to the measurement results by site environmental impact, they can not be achieved automatic temperature measurement and control, while only the measurement of high temperature measurement of low-temperature heat treatment only for thermocouple easier to corrosion or difficult to measure high temperature applications, such as induction heating surface temperature measurement, high-temperature salt bath furnace furnace temperature measurement.



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