Rules for correctly ordering constant temperature and humidity test chamber

Dongguan Kingjoy Environmental Testing Equipment Co., Ltd. [kingjo] is an enterprise specializing in the production of constant temperature and humidity test chambers. Now, constant temperature is the choice of the size of the test chamber for detailed analysis. How should we choose the volume when we purchase the environmental test box? Dongguan Qinzhuo Environmental Testing Equipment Co., Ltd. gives the following points as a reference:

When placing the tested product (components, components, parts or complete machine) into a constant temperature and humidity test chamber for testing, in order to ensure that the atmosphere around the tested product can meet the environmental test conditions specified in the test specifications, the working dimensions and The following points should be followed between the outer dimensions of the test product:

a) The volume of the tested product (W × D × H) shall not exceed (20 ～ 35)% of the effective working space of the test chamber (20% is recommended). It is recommended to select no more than 10% for products that generate heat during the test. For example, when a 2 1` color TV is used for the temperature storage test, a test box with a cubic volume can be used to meet the requirements, and when it is energized, it cannot meet the requirements. A larger test box should be replaced. , Because the TV set must emit heat when working.

b) The ratio of the windward cross-sectional area of ​​the tested product to the total area of ​​the test chamber studio on this cross-section is not greater than (35-50)% (35% is recommended). Multiple samples should be placed on the same plane as much as possible.

c) The distance between the outer surface of the tested product and the wall of the test chamber should be at least 100-150mm (150mm is recommended). The sample should be placed so as not to block the air outlet and return air outlet, and leave a certain distance for the temperature and humidity sensor. To ensure the correct test temperature.

The above three points are actually interdependent and unified. Taking a cubic meter box as an example, the area ratio is 1: (0.35 to 0.5), which is equivalent to the volume ratio of 1: (0.207 to 0.354). 100 to 150 mm from the wall of the box corresponds to a volume ratio of 1: (0.343 to 0.512).

In summary, the above three points stipulate that the working volume of the climatic environment test chamber should be at least 3 to 5 times the outer volume of the tested product.

According to the above introduction, when customers purchase constant temperature and humidity test chambers, they know that they use their products as reference materials to scientifically and rationally select various types of constant temperature and humidity test chambers to make the test scheme more scientific.

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