Friends who often browse this site will find that our relevant requirements stipulated in the high and low temperature test chamber standards have always been described as the origin of the standard and definition of terms, as well as some external conditions and content environment of the equipment. Understand the requirements for product structure and appearance in the following standards, and hope that this article can provide some small help to the new and old customers who are selecting high and low temperature test chambers. The standard is authoritative:
First, the inner wall of the test chamber should be made of materials that are resistant to oxidation and have certain mechanical strength. There shall be no sources of pollution affecting the test.
Insulation materials should be able to withstand high temperatures and have flame retardant properties. The insulation layer should have sufficient thickness to ensure that the temperature of the touched parts outside the test box is not higher than 50 ° C during the high temperature test, and should not be present when the low temperature test and the ambient temperature are 15 ° C ~ 35 ° C, and the relative humidity is ≤85% Condensation phenomenon.
Heating and cooling devices and cooling capacity should not be directly radiated on the test sample.
The studio should be equipped with observation windows and lighting devices.
The box door should be well sealed, and the sealing strip should have good resistance to high temperature aging and low temperature hardening.
The refrigeration system should not have defects of air leakage, water leakage and oil leakage.
There should be a sample rack for placing or hanging test samples. The sample holder should have sufficient high temperature and low temperature resistance.
There should be lead holes.
The appearance of the coating layer should be smooth, smooth and uniform in color, and there should be no traces of bottoming, blistering, layering or scratches.
Attachment: Safety and environmental protection requirements:
The insulation resistance value between the terminal and the metal shell of the box should meet: cold state 2MΩ or more, hot state 1MΩ or more (measured with 500V, accuracy is 1.0 Megohmmeter), and can withstand 50Hz AC voltage 1500V, pressure Time 5s withstand voltage test.
The protective ground terminal shall have a good electrical connection with the enclosure of the test chamber and be able to connect the ground conveniently and firmly, and shall comply with the provisions of 7.1.9 of GB / T14048.1-2000.
There should be over-temperature, over-current, water shortage and other protection and alarm devices.
The noise of the whole machine should not be higher than 80dB (A).
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