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Common cooling method and troubleshooting method for Damp heat testing chamber

Author: Source: Posted On: 2019/9/12 13:55:31

Some common faults and troubleshooting methods for the Damp heat testing chamber:

1. In the high temperature test, if the temperature change does not reach the test temperature value, the electrical system can be inspected and the faults can be eliminated one by one. If the temperature rises very slowly, it is necessary to check the air circulation system to see if the regulating baffle of the wind cycle is normal. On the contrary, check whether the motor of the wind cycle is running normally. If the temperature is too high, you need to set the PID setting parameters. If the temperature rises directly and the temperature is over-protected, then the controller fails and the control instrument must be replaced.

2, the low temperature can not reach the test index, then you have to observe the temperature change, the temperature is very slow, or the temperature has a tendency to rise after the temperature reaches a certain value, the former should check, whether it will be before the low temperature test Dry the studio, keep the studio dry, then put the test sample into the work room and then test it. If the test sample in the work room is too much, the wind in the workroom cannot be fully circulated. After eliminating the above reasons, It is necessary to consider whether it is a fault in the refrigeration system, so it is necessary to ask the professional staff of the factory for inspection. The latter phenomenon is caused by the poor use of the equipment. The ambient temperature at which the equipment is placed and the position at which it is placed (the interval between the cabinet and the wall) must meet the requirements (as specified in the equipment handling instructions).

3. When the equipment suddenly fails during the test operation, the corresponding fault display prompt appears on the control meter and there is an audible alarm prompt. The operator can quickly check which type of fault is involved in the troubleshooting chapter of the device's operation and use, and then ask the professional staff to quickly troubleshoot to ensure the normal operation of the test. Other environmental testing equipment will have other phenomena in use, and it will be specific phenomena, specific analysis and elimination.

4. In the temperature test such as Damp heat testing chamber, the product condensation phenomenon occurs because when the ambient temperature of the damp heat test chamber rises, the surface temperature of the product is lower than the ambient temperature due to thermal inertia, when the hot and humid ambient air encounters lower than When the surface of the product is dew point, water vapor will condense on the surface to form dew drops.

Moreover, if the product is sealed, when the ambient temperature is lowered, the inner wall temperature of the product casing is cooled faster than the air temperature in the cavity, and the hot and humid air in the cavity is also condensed into dew drops on the inner wall of the product casing. Since most products are not completely sealed, condensation is generally present during the warming phase.

The condensation is related to the material used in the product, the size of the cavity, the temperature rise and fall, and the relative humidity. The worse the heat absorption of the material, the larger the cavity, the faster the temperature rise and fall, and the greater the relative humidity, the more the condensation will be. Condensation can be prevented as long as any of the conditions under which the condensation occurs is destroyed.

How to choose two common cooling methods for Damp heat testing chamber?

We all know that high and low temperature test chambers need to be cooled after high temperature experiments. Generally, the cooling method is usually divided into air cooling and water cooling. Air cooling mainly uses air flow to generate heat convection, thereby reducing The temperature inside the box to achieve the purpose of cooling. In the case of water cooling, the flow of water and other coolants is mainly used to cool down, and the cooling efficiency of air cooling is lower than that of water cooling.

However, the cooling methods of water cooling and air cooling are not simple and random choices, but are determined according to the environment in which they use high and low temperature test chambers. For example, the temperature in different regions is the same, the temperature in the south is high, and the effect of selecting water cooling is better. The weather in the north is cold, water cooling is not suitable, and there is still ice, so air cooling is the better choice.

Water-cooled heat dissipation requires site water supply conditions, so there are certain site requirements; air-cooled heat dissipation methods are not required for the site, only ventilation is required, the temperature is not high, and an exhaust fan is sufficient. In fact, at the bottom of the matter, there is not much difference between water cooling and air cooling in high and low temperature test chambers, all for heat dissipation, but with different media and different heat dissipation methods. There is no one in the two who is good or bad. The reason why the choice of air cooling or water cooling is based on the actual situation of the customer.

 



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