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It is primarily cosmetic - the bezel was originally designed for diving, military activities or similar where counting down time was critical.
Before digital stopwatches etc were built into watches as a feature, what you did as a diver was turn the bezel to the time (say 30 minutes) of air you had left, then the minute hand would travel around the face to the position 0 on the bezel, telling you 30 minutes had passed.
You often find compass directions, various job specific calculators etc on bezels also, but unless you need a stopwatch / time reminder and don't have that feature in the watch itself, then it is purely a tradition to include a rotating bezel.
The original bezels would have the time markings going the opposite way to the watch face usually, however on many modern watches, they often go the same way, allowing you to see how much time has passed, rather than how much you have left.
Hope this clears things up :)
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It is a numbered ring surrounding the crystal [ glass ] which should be rotatable to bring the numbers to where you need them for various purposes....it has a spring loaded detent [ click! ] for each position....but , be warned,......some are fake ,decorative only, & dont work........jimbanjo
<P>Thank you for contacting FixYa.</P><P>I dont know much about Invicta, however they have a wonderful website where you can download instructions or contact them.</P><P><A href="http://www.invictawatch.com/welcome/manuals/">http://www.invictawatch.com/welcome/manuals/</A></P><P>Best regards.</P>
mcdevito75 here, That dial is used mainly on Divers watches for Divers, by setting this dial, you can tell how much air time tanks that divers use have in them. It"s main purpose though is to hold the crystal asssembly to the watch case. A specialized manual can tell how to use this outer dial, it can be used as a measure of distance and time.
It is designed for scuba divers to keep track of dive times and oxygen levels.
They are more for looks now than for practical purposes, but you can still use then as a simple timer. What I sometimes do with mine, mark the current minute hand with the 12 o clock mark. Now, you can gauge at what time a certain number of minutes elapsed will be. For example, if I have 35 minutes in a parking meter, and the time is 10:20, I will mark my minute hand, and when the minute hand reaches 35 minutes on the dial, I know my time is up.
If you have no markings on bezel there is no practical use for this feature. Bezels with markings are used as a tachymeter (for calculating speed of the moving object) or as a countdown timer for sporting events or diving. In your case bezel is becoming loose and thats why it is turning as I can't see the point why the watch should be fitted with rotating bezel with no markings on it.
The rotating bezel is merely an indicator guide. What you do is rotate until the triangular pointer is aligned with the minute hand. Now, as the minute hand moves forward, it points to the elapsed time indicated on the bezel.
For example, let's say it is 9:23. You align the pointer with the minute hand. At a future time, say 9:31, you look at the watch. The minute hand should now be pointing at roughly 8 ON THE BEZELl. That's the difference between when you started and now.
Recognize that this is a rough guide, without anywhere near the accuracy of a chronograph. Also, you don't want to be operating a chrono underwater (do not press pushers underwater!) It just saves you having to remember when you started, and then doing the math to figure the elapsed time.
It sounds like the pump may be faulty. These are not cheap ! Could be a faulty pressure sensor, loose pipe connection or blocked fuel filter. Check the fuel filter is clear of water and dirt. Check there are no visible leaks between the pump and the injectors.
Have you run it low on fuel ? It is possible to get air in the system, and as air is more compressible than diesel, the pump pressure sensor may be showing a low pressure.
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