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TimeTechTalk.com > 3T Official Brand Forums > Benarus Taucheruhren/SteVral > Water Resistance Testing |
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TimeTechTalk.com > 3T Official Brand Forums > Benarus Taucheruhren/SteVral > Water Resistance Testing |
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| Water Resistance Testing | Rate Topic |
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| Posted: Tue May 31st, 2011 06:45 pm |
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13th Post |
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graymadder 3T WIS
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I have a question regarding the testing process. If your watch fails at a given depth rating, does that mean your watch got wet from the test and has possible water damage? Total noob question, but just curious.
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| Posted: Tue May 31st, 2011 10:51 pm |
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14th Post |
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Steve Laughlin 3T WIS 
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I don't have one yet, or the manual in front of me, but this is what I understand from searching the internet: with a wet test, the watch is suspended above the water and you build up the pressure before sinking it, if the watch is not water tight, it blows the air out underwater, the built up pressure from above is in the watch, the water doesn't go in. you must lift the watch back up before releasing the air pressure. if done correctly there is no risk to the watch. also the case itself can be tested without the parts inside, with the crown and case back are screwed back on for the test, then you know the case and gaskets are in good working condition. re assembling the watch after the test is not an issue with water resistance if one knows what he is doing.
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| Posted: Wed Jun 1st, 2011 12:24 am |
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15th Post |
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oagaspar Site Founder 
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...from what I know,only the watch cases are tested at the factory,and not the completed watch,for completed watches you can read what Rolex aficionado,James Dowling, posted on TZ in 97' ...these methods remain the same: Here's how it is done Posted by James M. Dowling on November 02, 1997 at 23:29:53: In Reply to: Re: Richard..set me straight on this please... posted by R.paige on November 02, 1997 at 15:08:53: Hi Guys, There are essentially 2 methods of testing the impermeabilty of a watch case with the movement inside; the Rolex method and the Portescap method. The Rolex one uses water but still can not damage the movement here is how it works. The machine incoporates a glass tube one third filled with water which has a screwed top with a pressure guage and the bottom end sits on a vacuum pump. The watch is suspended from a hangar at the top of the tube and the air above the water is then sucked out. As the pressure inside the watch (normal air pressure) is now higher than that in the tube it will attempt to escape and equalise the pressure (nature abhors a vacuum and all that) if it does succeed in escaping from the case it will be seen as bubbles rising from the case. Simple really!! The Portescap system places the watch on a platform inside a vacuum chamber. The chamber is then evacuated of all air and a pointer is lowered until it touches the glass of the watch; the air in the watch is now at a higher pressure than that in the chamber (air pressue vs vacuum) and it will once again try to escape if it does so the case will suddenly contract as the pressure equalise and this will be registered on a micrometer guage connected to the pointer touching the glass. Both methods are what is known as non-invasive and/or fail safe; in other words it is impossible for the watch to be harmed by the testing methods. I hope this helps to explain; if not...please ask. Good luck , James
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| Posted: Wed Jun 1st, 2011 10:06 am |
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16th Post |
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bigrustypig 3T WIS 
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Thanks for that one, Oscar. I learned something new again today. 
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| Posted: Wed Jun 1st, 2011 05:01 pm |
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17th Post |
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joecb 3T WIS 
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great question graymadder....I also learned something new today, TY for the info Steve & Oscar..
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| Posted: Wed Jun 1st, 2011 05:44 pm |
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18th Post |
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graymadder 3T WIS
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Thanks, and I thought I was asking a noob question. Thanks Steve and Oscar.
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| Posted: Sun Jun 5th, 2011 05:17 pm |
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19th Post |
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Pearlmanz 3T WIS 
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Thanks for posting Steve as I might need to send my watch in for a check on the stem and it might require opening the case. I appreciate you letting us know.
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| Posted: Sun Jun 5th, 2011 05:27 pm |
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20th Post |
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rob.winter 3T WIS 
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Very interesting information Oscar. The Rolex method makes sense. I am learning so much from all here.
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