Basically, all watches are water resistance test carried out with the experimental methods , experimental method to simulate deep water pressure, and in a real deep state or differentiated . Experimental method is more often relative and conditional, for example , the test of time , water temperature , watch the state ; test time and test for stress-related , the greater the pressure , but the shorter test time ; water temperature is room temperature , about 23 degrees , watches are still being tested positive .
Actually watch the situation in contact with water experimental conditions ( environment) is very different , so , many consumers will be the identity of the watch is water-resistant misunderstanding might go swimming with a watch or even to " Zha Mengzi , " resulting in the watch into the Water . If you watch water resistance is a problem, doing quality testing , they will not do in real deep water test , but in the water jar test experiments . Waterproof watches experiment is the industry standard , QB / T 1897-1993 " watches waterproof watches " waterproof watch a good variety of test methods , such as compression, decompression , and condensation experiment .
Currently used in the watch industry, many types of water testing equipment , but to increase the types of pressure are more basic is sealed cans , compressed air pumps fill it to play , fast test times in this way , defects can not be sure watch parts not sealed , Therefore, in the production industry is more used .
Done alone , or a few watches waterproof test , it will use the water test tank , this thing of Switzerland and Japan , produce, test medium is water, glass jars with a pressure gauge at the top , fill it with a handle used to boost the morale of pressure .
Glass jars red line irrigation , the red line is the water level , the glass covered with a deflated valve , experiment by shaking up and down the handle to increase gas pressure to observe the pressure gauge pointer is generally added to 3 atmospheres ( this depends on the watch Waterproof logo) . Tested watch hanging rods to hang the top , this time , it is best to remove strap, plus the pressure of time , watches are more than needs to be upgraded to the surface , that is, watch to withstand pressure in the air . When the full pressure indicators , the need to maintain pressure for 90 seconds this time, because the pressure imbalance , if the watch cases are not sealed , then the compressed air will enter the internal case .
Prevention is not waterproof watch , the main target is to see under the pressure of the air leakage flow rate , the standard is 50 micrograms / min , if exceeded this target , it was regarded as unsatisfactory water resistance .
After 90 seconds , put the watch down below the water surface , and then press the valve , if the free air bubbles from the case , glass , watch the Department leakage , and the same location more than 3 consecutive bubbles emerge , then the watches on Waterproof failure , rough that a bubble is equivalent to about 50 micrograms .
Decompression is carried out in the water , this device can find the biggest advantage is not sealed or water watch the site , doing the tests , there is a requirement , because the increase of pressure may be subsiding watch glass (especially the early Plastic watch glass ), but watch the second hand can not touch the glass and stopped walking , a sudden decompression at the time , nor can it be high-pressure air- glass roof open .
Sapphire watches are now the basic glass , and the depth of water-resistant watch has a considerable thickness of glass , the early years I used Swiss FH-5 waterproof device, which device is relatively large , one can simultaneously test five watches, it has Pressurized storage glass observation port .
Water pressure test tank test range is generally 6-8 BAR, also marked kg / square cm . Decompression tests can be done there , the general life of waterproof watches , vacuum test is to do 400 mm Hg pressure , and sometimes pressure to do more formidable than the decompression experiments , such as aerospace and mountaineering watches for professional use , should Do decompression experiments .
Waterproof watches in doing experiments , made of sheets and a single case can all be done , but if the watch is as if the watch was found when the vacuum is no longer waterproof , should prompt the rod from the water , immediately open the watch to bake Dry , water is particularly serious , but also on the watch movement to do cleaning . Best waterproof test jar in the increase of water distilled water , even waterproof watches qualified , after the test , but also on the heater or the thermostat box , for drying.
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