water Resistant wristwatches
What is the resistance, is measured in what?
For a wristwatch in addition to mechanical damage, external sources of danger can be called a magnetic field,dust and water. Technological progress is by leaps and bounds, it seems that to place the clock mechanism in a completely sealed housing is particularly difficult. However, it is not so simple. Crown and additional buttons require holes in the case, this means that there can leak moisture. To increase the tightness of housing significantly extend the life of watches, so it's safe to say that the resistance became a revolution in the time the world and changed human life for the better.
Modern manufacturers label their products with labels that contain information about the degree of protection hours from the water. There may be some confusion. The word "waterproof" implies absolute tightness. In fact the water resistance is linked not with integrity, and with the pressure level, which maintains the building, not flowing into the water.
Currently, in the standard notation of water resistance uses the units of meters and the number of atmospheres. Atmosphere bars show the strength of the pressure which the water column is able to withstand watch (1 atmosphere or 1 bar =10 meters).
The declared depth on the dial does not mean the permissible immersion depth!
This is due to the fact that water resistance is measured in laboratory conditions, where the watch is in a static position at a constant temperature. If these conditions add dynamics to hands when swimming and diving, the pressure on housing will increase. Therefore, it is erroneous to think that watches with the marking of 30 metres, you can dive even at ten meters depth.
Classes of water resistance
10 meters (1 ATM) : watch can withstand splashing, rain and sweat.
30 meters (3 ATM): watch can withstand splashes, rain, hand washing. If the clock is an inscription WATER RESISTANT, but no specific numeric designations, so that its water-resistance 30 meters (3 ATM).
50 meters (5 ATM): the most controversial class of water protection. Despite the promises of manufacturers that watches marked "Water Resistant 50m" can swim fearlessly, I do not advise completely to rely on.
100 meters (10 ATM): in hours you will be able to take a shower, swimming and diving, no deep diving.
200 meters (20 ATM a): models marked with "Water Resistant 200m" fit for diving to a maximum depth of 50 meters and stay in the water for no longer than 2 hours.
300 meters and above (30, 50, 100 ATM): a watch suitable for deep diving (diving) diving.
Table class water resistance
5 tips to extend the life of waterproof watch
Regular contact with water, check the clock every year, in the absence of one every 2-3 years.
When the watch is wet or in water, it is highly recommended not to Unscrew the crown. Before bathing, dipping, be sure to check the properly screwed in.Also I do not advise to click on the watch button, otherwise there is a risk of water getting into the case.
If the glass has condensation and at the moment it is impossible to contact the service center or corporate store hours for advice, dry the clock, putting them in a warm dry place and untwisted the crown.
Always remove the watch from your wrist before the bath, sauna or Jacuzzi. Under the influence of high temperature sealing gasket in the housing may be deformed, and the glass may deviate from the body. Additional harm from the bath procedures in hours – condensation and subsequent rust on parts of the movement.
When injected into the body of salt or chlorinated water in order to wash under running water.
How to choose a waterproof watch for scuba diving?
Sealed enclosure – not the only guarantor of long life waterproof watches. You need to pay attention to all elements of the design.
A good indicator of water-resistance implies the presence of strong steel hull, ideally equipped with a screw-down case back. Glass thickness shall be not less than 4 mm, otherwise it will not withstand water pressure and likely formation of cracks. The crown should be screw locked and with extra protection at the sides. In case you are choosing a watch for scuba dive bracelet/strap usually made of stainless steel, rubber or neoprene, providing a reserve volume of the wrist is required when diving in a diving suit.
An important detail is the rotating bezel. It needs to rotate only counterclockwise and have special protection from accidental rotation in the opposite direction.
Diving watches are usually equipped with a dial from which the information can be easily read at a distance of 25 cm (in the dark). The minute hand should be easily distinguishable from the watch. In the model there should be a progress indicator such as second hand with luminous dot.
Watches for diving are additionally subjected to a severe test. On the strength of the watch movement is tested using frontal and side-impact plastic hammer. The test is considered successful if after the deviation the accuracy does not exceed /- 60 seconds per day.
Test for resistance to salt water looks like this: the clock is placed in a solution with a concentration of sea salt close to the levels seen in vivo (approximately 30 grams of salt per liter of water) and left for the day. Temperature 18°C-25°C. a Mandatory requirement for completion of the test for full functionality. Separate tests are strap/bracelet for strength.
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