How to detect the sealing of Temperature Humidity Chamber

Scope of application
Suitable for performance reliability tests for industrial products. This Temperature Humidity Chamber has a large temperature control range, and its performance indicators meet the requirements of national standards GB/T 2423.1-2008, GB/T 2423.2-2008, GB/T 2423.3-1993. The Basic Environmental Test Specification of Electronic Products “Test A: Low Temperature Test Method; Test B: High -temperature Test Method; Test C: Wet and Heating Test Method;”, conducts high -temperature temperature and humidity tests on the product.

At present, there are often tests in high temperature and low temperature environment. Therefore, high and low temperature test chamber appears, which can reach 150 degrees under high temperature conditions. At this time, it depends on what it is sealed.

The design of each cable hole and ventilation of Temperature Humidity Chamber is very particular about the design of the ventilation holes, and the equipment is unreasonable, resulting in too large the gap and is not sealed. The problem of door density sealing is also the key. We often ignore this problem, thinking that the sealing strip is added, and the hinge of the door should be sealed. However, due to the aging and hardness of the rubber sealing strip, the choice of hardness is unreasonable, and the fixed method of sealing strips is often used. The main thing is the sealing problem of the door. Because the size of the Temperature Humidity Chamber is usually relatively large, the size of the chamber door also increases, and the result is very large. After a long load, the hinge of the vertical direction will be displaced and the opening door dislocation is not strict.

The occurrence of the sealing problem of Temperature Humidity Chamber, some are design problems, and some are maintenance problems. Therefore, we must strictly perform regular maintenance in accordance with the equipment maintenance manual in the use of equipment to ensure that the equipment is running normally and the technical parameters do not offset.

The relative humidity of the high and low temperature test chamber is a ratio between humidity and high humidity. Its value shows how high the saturation of water vapor is, and its unit is %. E relative humidity air is saturated air. The relative humidity is 50%of the water steam at half of the saturated point of the same temperature of the same temperature. Water vapor in the air with a relative humidity of more than 100%condenses. As the temperature increases the air, the more water can be contained, that is, the relative humidity increases the relative humidity when the same water vapor is increased. Therefore, it must also provide temperature data while providing relative humidity. You can also calculate the dew point by relative humidity and temperature.

The high and low temperature test chamber is the environment required to provide the test in the closed cavity. The door will be installed on the test chamber for the test product. The test chamber will also be configured on the test chamber of the pilot supply or testing of the test product.
If the sealing effect of the test chamber is not good, it will bring the following consequences:
1. The temperature of the test chamber will slow down;
2. The evaporator is frost, and the limit cannot reach the low temperature;
3. Extreme humidity is here;
4. Drip water when high temperature and high humidity, the water consumption becomes larger.

Through testing and debugging, we can avoid the above situation as long as we pay attention to the following points to avoid the above situation:
1. Usually check the sealing of the gate seal when maintaining the equipment, check whether the sealing strip of the door is broken or defect, and whether there are not strict sealing (A4 paper is cut into 20 ~ 30mm paper strips, placed in the gate seal sealing At the entry, closing the door, it is necessary to get out of the door).
2. Do not have foreign objects at the gate of the gate before doing the test chamber. Do not lead the power cord or test line from the gate;
3. Confirm that the test chamber door is closed at the beginning of the test;
4. During the test, the door of the opening and switching of the high -low temperature test chamber door is prohibited;
5. Regardless of whether there is a power cord/test line, the derivation hole should be sealed with the silicone seal provided by the manufacturer and confirmed the seal.

Temperature Humidity Chamber is used to simulate a temperature enviromental condistions, it may also be called environmental chambers or Thermal Chamber or Temperature Chamber. You can click the below videos to learn the details and also how to operate it. The temperature deviation is a common means to ensure the effectiveness of the performance indicators. How can we calibrate the temperature deviation of the high and low temperature test chamber?
1. Calibration under the condition of no load: The advantage of this method is: the entire working area of the high and low temperature test chamber has been calibrated, the test sample becomes more timely, and the applicability of the high and low temperature test chamber is not required. Its main disadvantage is: the impact of the test sample cannot be evaluated on the test chamber.

2. Calibration under the condition of load: The advantage of this method is that it can accurately evaluate the effects of test samples on the performance of the test chamber, and it is easy to obtain detailed information about the environmental test of key components or parts of test samples. And its main disadvantage is: when the test sample is replaced, it needs to be re -calibrated.

3. Real -time measurement during use: This method not only has the advantages of 1 and 2 methods, but also can obtain comprehensive environmental parameters in the process of environmental testing. Its main disadvantage is that the measurement equipment is required for each environmental test, and the calibration methods are usually adopted on time in the test chamber calibration process.

 

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