The method on fixed thermocouple heat1

Fixed thermocouple heat the method has the following three ways: 1, contacts

contacts fixed in legal system will be supplied only by that point of the work junction of the thermocouple, the temperature field change is bigger, so the temperature measurement error is bigger.

2, parallel welding contact parallel welding contact system will be the two thermocouple wire welding on the measured wall respectively, two solder joint spacing of 1 ~ 5 mm. The thermocouple loss of heat from a small area between the two electric wires. Heat loss per unit area is lesser, the change of temperature field, temperature measurement error is small. It is suitable for the isothermal wall body and homogeneous material.

3, isotherm contact isotherm contact system work of thermocouple side wall after a certain point contact with the thermocouple wire laying along the isothermal surface distance ( About 50 times the diameter of the thermocouple wire) After the derivation. The fixed methods of temperature measurement error to a minimum, is the most widely used method in the study.

for non-metallic surface, often first thermocouple welding on the good performance of thermal conductivity of metal sheet, such as copper, then the chip and the wall close contact. The measurement results can get a satisfactory.

if measured on one side of the wall is a fluid, thermocouple wire fixed to the wall, should pay attention to fluid flow is affected, cause the change of flow field, accordingly changed the situation of heat transfer between fluid and wall and wall temperature field, produce larger temperature measurement error, in order to reduce the influence on fluid flow, scarf is recommended for the law, and will surface polishing after welding, keep the surface smooth. At the same time, the thermocouple wire must be from the downstream direction of the fluid, the conductor's influence on the flow occurs after the temperature measurement, so as to make the temperature measurement error to a minimum.

to measure wall temperature fashionable attention should be given to the choice of the temperature measuring point. According to the requirement of the wall temperature select representative points as a temperature measuring point. For example is proposed to measure the pipe cross section of the wall temperature and temperature distribution in cross section. In this case, can choose several temperature measuring points, said by each point temperature to calculate its average wall temperature of the cross section.

summary

in order to ensure the accuracy of temperature measurement, in addition to the above the installation of the temperature sensing element, still must pay attention to the temperature display instrument and the installation of wires. For example, display instrument is away from the strong electric field, magnetic field; Whether you need wire shielding, the resistance of the conductor for requirements; Whether the instrument type, specification and thermal component matching, the measurement accuracy meets the requirements. In general, display instrument installation need to meet the requirements of the meter sample installation requirements.

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