dry cabinet choosing for electronic components

2. The important point for choosing the auto dry box at normal temperature meeting with the standard of IPC/JEDEC J-STD-033.
    (1) Choose the auto dry box according to the usage.
The cleft dehumidifier can catec dry cabinet lower the humidity down to RH10% and meet with the request of the IPC/JEDEC J-STD-033 standard but its speed is slowly. So it is fit for the customers who seldom open the box door and not fit for the customers who should open the box door to put in or take out articles everyday such as research laboratory.
     To the customers such as working-room who use the auto dry box catec dry cabinet as a tool and open the box door many times everyday, the cleft dehumidifier has the problem that it should take 8 to 10 hours or much more time to lower the inside humidity down because the water in the IC or other articles in the box is drawn out continuously to increase the inside humidity. So the box door can't be opened catec dry cabinet for putting in or taking out the articles again in a day and it should take 8 hours again to lower the inside humidity down because it enters the "preparing process" once the door is opened for taking the articles in or out. But according to the IPC/JEDEC J-STD-033 standard, the SMD component with 5-5a level of damp sensitivity should be put into the auto dry box with RH10% humidity for 200 minutes to recover its life if it is unpacked and exposed at the environment where the humidity is lower than or equal to RH30%-60% for 20 minutes. And the time to recover its life in the auto dry box should be much longer if it is unpacked and exposed in the environment where the humidity is higher than RH60%. Therefore, it should take more than ten hours, even more than twenty hours to recover the life of IC for one time from putting it catec dry cabinet in the auto dry box and start the "preparing process" to lower the humidity down to RH10%. Obviously, it can't meet with the demand for working-room. So the cleft dehumidifier is not the best choice for the customers who use it in working-room as a tool.

      (2) Choose the auto dry box according to its credibility. 
       The demand to the driving device for the drainage door of the auto dry box used for saving articles is lower than that of the auto dry box used as a tool because of seldom opening the catec dry cabinet door to take in or out the articles and it stops at once the inside humidity is lowered down to the pre-set value. If choose the auto dry box driving by memory-alloy spring, the memory-alloy spring is excessive tired to shorten its life so as to lead the auto dry box break down early. The after-sales fix is not guaranteed if the factory is closed because the memory-alloy spring is specially made by factory and can't be bought in the market. Therefore,catec dry cabinet  to the customers who use the auto dry box as a tool or for saving important articles and need high credibility, the product drove by memory-alloy spring is not a proper choice.
       In addition, the circumstance of the manufacture such as the mature craft, stable quality, etc. should be taken into consideration in the process of choosing proper auto dry box.

      (3) Choose the auto dry box according to the request of anti-electrostatic.
       It has already been known extensively that the static electricity is harmful to the electronics component and the catec dry cabinet environment humidity is lower, the damage is more serious. So it is necessary to purchase the stainless steel auto dry box or the auto dry box sprayed the anti-static electricity coating if put in or take out the IC in the environment with ultra-low humidity. In addition, the box body should install a pillar for exhausting the static electricity to the ground. The anti-static electricity coating contains the roast paint and resins. The roast paint with many kinds of color is more beautiful but its endure ability to rub is bad and is not proper for using at the working-room. The resin with simple color is not so beautiful but its endure ability to rub is good. Take the environment of working-room and catec dry cabinet long-time usage into consideration, the auto dry box sprayed the anti-static electricity resin is a proper choice.

       (4) Choose the auto dry box according to the request of the control accuracy.
       A. The total numerical product controlled by calculator adopts electronics humidity conductor, digital hygrometer, CPU, catec dry cabinet saving device and so on. Its characteristic is that the customer pre-sets the inside humidity through the "+" "-" bottom and the initial value increases or decreases 1% when press once. This kind of product has very highly control credibility and accuracy.

       B. The semi-numerical product mainly controlled by imitate electric circuit adopts electronics humidity conductor and digital hygrometer without CPU and saving device. Its characteristic is that the customer pre-sets the inside humidity through pressing catec dry cabinet the light tube and the initial value increases or decreases 10%, not 1%, when press once and a light tube is lighting on. Its control credibility and accuracy is so high as that of the product controlled by the calculator.

         3. conclusion
          (1) The cleft dehumidifier is a proper choice if use the auto dry box as a saving cabinet or seldomly open the door to put in or take out the articles.
         (2) The continuous dehumidifier is a proper choice if use the auto dry box in the working-room as a tool

          (3) The auto dry box driving by memory-alloy catec dry cabinet is proper for the short-term customers such as the item set that is dismissed once the work is completed. 
          (4) The customers who use the auto dry box as a tool or to safeguard the valuable articles and need high credibility should choose the auto dry box driving by micro-motor. Although some auto dry boxes driving by memory-alloy spring guarantee after-sales fix for 3 to 5 years, after-sales fix not equals to no break-down and it is very vexed to fix such big box two times in a year. With this contrary, the auto dry box driving by micro-motor guarantees more than ten years of no break-down time and after-sales fix time.
         (5) It is necessary catec dry cabinet to choose the stainless steel auto dry box or the auto dry box sprayed the anti-static electricity coating, but this kind of auto dry box is expensive.
         (6) The total numerical auto dry box controlled by calculator is a better choice than the semi-numerical product mainly controlled by imitate electric circuit.
         (7) It is not essential and necessary function such as displaying temperature and so on.
          (8) The price of different brand auto dry boxes should be compared among the products with the same structure but not among those products with different structure and it is not proper to take the price first catec dry cabinet into consideration. The biggest benefit for the customers is that the auto dry box can meet the demand with long life and high credibility.