What is diving watch？
What is diving watch？ as the name implies, refers to a watch for diving (a watch that has been treated with water and moisture resistance for divers. General waterproof watches cannot be used for diving. Diving watches must comply with strict regulations and are not waterproof. Strong can be called a diving watch. Simply put: the diving watch should have higher waterproof performance, and have luminous hands and scales that are convenient for reading the time in the dark.
Although the deep sea is full of fun to explore, unpredictable dangers may also occur if you are not fully prepared. At this point, a reliable diving watch not only lets you know the time, but also helps you complete the journey smoothly. The source of this safety is not only the excellent waterproof depth of the diving watch itself, but also the following five Function.
Function 1 Corrosion resistant flexible strap
Under water, no matter whether you wave your arms or operate equipment, we need our wrists to rotate flexibly. At this time, the watch needs to be tightly fixed on the wrist. Although many diving watches are equipped with metal straps, the chemical composition in the seawater will cause slight corrosion to them, so it is still recommended to replace them with rubber straps with better water resistance and corrosion resistance during diving. Nowadays, some brands are also specially developed It is also a good choice for a canvas or man-made fiber strap.
Function 2 Screw-in non-slip crown
Where is the easiest part of a watch to get water? The answer is definitely the crown, because the crown is the only part that connects the outside world and the movement. In order to prevent water from entering the movement through the crown, watchmakers developed a design called screw-in crown—a waterproof apron made of rubber is added to the connection of the crown, when the crown is tightened , The water is tightly isolated from the watch (similar to the rubber pad at the water pipe valve in our home). There are also many diving watches to upgrade it, they not only have a larger crown, but also add deeper pit processing on it, making it more non-slip and convenient for underwater operation.
Function 3 Helium exhaust
"Exhaust helium" is a very professional function, it is usually used for professional diving watches (waterproof above 1000m). Because it is impossible for a full-time diver to go back and forth to the surface every time when working in the deep sea, it will waste too much time to decompress (see the watch class). Therefore, they must live in a deep-sea high-pressure diving cabin for a long time, but at this time, a considerable amount of gas will be dissolved in the blood, so the air used in the general diving cabin is a "helium" oxygen mixture. Since helium molecules are smaller than water molecules, when we are under high pressure for a long time, helium molecules will penetrate into the waterproof watch to fill it with high-pressure helium. Once it returns to the surface, if the high-pressure helium in the watch cannot be shortened When time is exhausted, the watch will explode due to high pressure.
Function 4 luminous indicator
Under water, we will strongly feel the yearning for light. As a basis, all diving watches will be equipped with eye-catching luminous hands and scales. Usually the pointer, scale or surface of the diving watch will be coated with fluorescent material, and the size of the pointer and scale will be enlarged to make it easier for divers to read. The early luminous material was radium, which was discontinued because it contained excessive radioactive elements. The most commonly used luminous material is Super-LumiNova. It absorbs the gamma particles in the light to store light, and can continue to emit light for more than 10 hours (but the luminous intensity will have an attenuation effect after a certain period).
Function 5 rotating bezel
The rotating bezel serves as a reminder of the diving time. The marking scale of the rotating bezel is 15, 30, 45, because the general diving oxygen cylinder can only last for 45 minutes (some are marked with a 60-minute scale). The first 15 minutes are colored or specially marked, because divers will strictly observe a 15-minute safety stop when ascending for diving decompression. Usually, just turn the bezel during diving, make the 0 scale on the bezel align with the minute hand, and then look at the scale on the bezel after the minute hand moves to know the diving time. Of course, you can also use it as a countdown timer. First know your diving time, turn the bezel to align the minute scale with the minute hand, and then the time when the minute hand moves to the 0 scale of the bezel is exactly your diving limit time. The rotation of the external bezel is mostly designed in a single counterclockwise direction. This is to ensure that the calculation time is only large, not small, and to prevent delays and dangers. In recent years, the newly emerging built-in chronograph bezel has no restriction on the direction of rotation, because the crown that controls the bezel must be locked before launching.