Relevant elements to be aware of when selecting high and low temperature test chambers
1. Whether the temperature scale equipment has a humidity function. We have a high-low temperature damp heat test chamber or a constant temperature and humidity test chamber with humidity scale. The humidity scale is generally controlled at 30%~98% PH (temperature between 25 °C and 80 °C)
Second, the system control hardware in the hardware purchase, mainly based on the customer's actual operation, experimental aspects and combined product costs to choose. For example, the refrigeration compressor of the small high-low temperature damp heat test chamber generally uses the low temperature back pressure compressors of the Italian “Aspen†and the French “Taikang†brand (we have few domestic production, so only the imported compressors are selected). Our domestically produced compressors are high temperature compressors and are generally used in refrigerators and air conditioners.
Third, whether the test product is energized and the thermal load condition to select high and low temperature test chamber, must consider the condition of the load, because the speed of cooling and the limit of low temperature electricity, and the load of the experimental box. Under a no-load condition of a standard high-low temperature environment, the general design cooling capacity is 1 °C / min, and the cooling temperature after loading is determined according to the actual condition of the experimental box. If the load is too large, it may not be cooled. Four spatial scales select and select the inner space of the experimental box. The internal specific dimensions are in terms of depth × width × height. After the sample is placed in the box, the environmental conditions of the sample can be satisfied. There should be three points between the spatial scale of the climate chamber operation and the scale of the product to be tested:
1. The volume of the sample product shall not exceed one-third (33%) of the effective working space of the experimental box, and the recommended product for heating in the experiment is not more than 30 mm;
2. The ratio of the windward breaking area of ​​the tested product to the total working area of ​​the experimental box on the section is not more than one third;
3. The distance between the outer surface of the test product and the wall of the test chamber should be at least 100-150mm.
Fifth, the requirements of the device power supply High-low temperature test box is equipped with a relatively large electrical components such as heaters, refrigeration compressors, etc., generally acquiesced to the power supply for three-phase 380V, so that the three-phase power supply of the equipment is not balanced to the customer's power grid. Bringing disturbances; about R&D companies in office buildings, there is often no three-phase electricity, and it needs to be equipped with 220V voltage power supply. This requires pre-sales negotiations with manufacturers.
Sixth, temperature scale The current mainstream temperature of commercial products is: A: 0 ° C ~ 100 ° C; B: 40 ° C ~ 150 ° C; C: 70 ° C ~ 150 ° C; D: other wide temperature scale - 70 ° C ~ 350 ° C Such as the high temperature zone -70 ° C ~ 150 ° C high and low temperature test box, generally used for data testing occupations, basically not independent purchase, often with the data room inspection machine together, for the data detection supply multi-factor, function, comprehensive Experimental equipment.
Seven, follow the bad function
This function is also called "program operation", "programmed operation", "programmable operation, etc.". Whether the device has a temperature cycle function is: repeating the cycle switching between the temperatures and changing the curve cycle. We refer to such a device with a cyclic function as a high-low temperature alternating test chamber.
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