Walking in the rain, shoes will inevitably get wet. The constant temperature and humidity test box has been tested a lot, and will inevitably encounter the situation of large temperature deviation. Over the past ten years, from apprentices to equipment engineers in the constant temperature and humidity test box industry, we have seen many brands of the constant temperature and humidity test box, and naturally understood the causes and solutions of the abnormal situation.


For the problem of large temperature deviation. There are two main situations:


1. Quality of products. This is a very common situation. Although the quality of domestic brand constant temperature and humidity test box can be comparable to that of imported brand, there are also some enterprises that are not technically competent. If contact with this industry more, just look at the appearance, you can immediately see the advantages and disadvantages, but their prices are really attractive, the general and industry average price is not an order of magnitude. They may not have after-sales, or they may have promises to sell, but ten horses with malfunction after selling can hardly pull him over. Some seem to be spiritual, just after the sale began to paralyse, to repair, than to buy a new one is even more expensive. So before you buy it, you can have a look at it. If you do not know about the constant temperature and humidity test box, see and touch the operation or do not know whether it is good or bad, you can identify the product through a third-party appraisal agency.


The origin of appraisal institutions is to set a standard for the industry. For the Guangdong region, the Guangdong Association of High-tech Enterprises (the Association of Guangdong High-Tech Enterprises) is a relatively stringent association with very little water. To get its certification, there is no other way for the products to reach its quality standards.


2. Use incorrectly. In 2009, I just finished my apprenticeship and entered the stage of technical students. I received a maintenance request from a customer in Baoan, Shenzhen. From what I saw later, it could have been solved by telephone communication, but because of the relative lack of experience, I didn't expect this problem, so I went to repair it myself. When I got to the scene and opened the door of the constant temperature and humidity test box, I was silly. Users detect large cartons. The whole carton is stuffed directly into the box. The size of the carton does not match the size of the box in the constant temperature and humidity test box more closely, and there is almost no space.


The constant temperature and humidity test chamber achieves uniform temperature in the test chamber by means of air circulation. The airway is blocked, the airflow can not flow smoothly, the temperature can not be transmitted, and the deviation value is naturally high. So when doing the test, the volume of the test sample is less than one third of the size of the box in the constant temperature and humidity test box. But most of the companies I met wanted to save as much as possible. For some high quality equipment, the volume of the test products could be less than four-thirds.


Another case is that the volume ratio of the test sample is not large, but there are still temperature uncertainties. Most of this is because the sample is placed too close to the air duct to block the air in and out. The air duct is located at the top and bottom of the back of the inner box. It is suggested here that the distance between the sample and the back of the duct should not be less than 5 cm.