What are the conditions for selecting a constant temperature and humidity test chamber? Which models and which equipments are suitable for you? Here, some precautions when purchasing a constant temperature and humidity test chamber can be given as an index.
First, the appropriate test equipment should be selected according to the size of the tested product. Second, the volume of the test product can not exceed the effective working space of the test box (20-35). Our company recommends that the product that generates heat in the test should be no more than 30mm; third, the windward area of ​​the test product and the test on the section. The ratio of the total area of ​​the working space of the box is not more than 35-50; fourthly, the outer surface of the test product is kept at least between 100-150 mm from the wall of the test box.
We also need special consideration in terms of performance. Focus on the following four points:
1. Temperature range: What is the temperature range of the equipment? There are four standard temperature ranges available: (1) 0°C~100°C; (2): -20°C~150°C; (3): -40°C ~150 ° C; (4): -60 ° C ~ 150 ° C. If the non-standard temperature is required, it can be produced and the lowest temperature can reach -90 °C.
2, the cycle function: the equipment does not have the temperature cycle function, that is, the cyclic cycle between the temperature cycle. The device having such a circulation function is named as a high-low temperature alternating test chamber (GDJW).
3. Humidity range: The device has no humidity function. We have a high temperature and low temperature humidification test chamber (GDS) or a constant temperature and humidity test chamber (HS) with a humidity range. The general humidity range is controlled from 20% to 98% RH (temperature between 25 ° C and 80 ° C).
4. The choice of system control hardware. In the purchase of hardware, it is mainly based on actual operation, test use and collection product cost. For example, in terms of refrigeration, some production uses imported fully enclosed refrigeration compressors, thermal expansion valves, drying filters, solenoid valves, and so on. In terms of the control panel, there are large-scale full touch screen control methods for domestically-made button-type and imported.
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