— 28 —
The difference between these two situations in the amount of bubbles produced.
In the case of defective water resistance, bubbles are released continuously, while in the case of
air trapped in the gaps as described above, the number of bubbles is less and bubbles no longer
appear after a short time.
In the case of watches in which the entire case is covered by a bezel as in the G-Shock and Baby-
G models, the amount of air trapped in the gap between the case and bezel is quite large.
It is therefore recommended to perform the waterproof inspection after first removing the bezel on
these models.
6) Furthermore, when a watch has been found to have defective water resistance, the watch
should be taken out of the water as soon as the defective location can be determined.
If the watch is left in the water until the scale reaches 0, water will begin to penetrate inside the
watch resulting in the risk of damage to the module.
10-2 Air Leak Checker
This instrument is also used to perform waterproof inspections, but there is no risk of damage to the
watch caused by entrance of water even for watches with defective water resistance.
In addition, since the waterproof inspection can be performed in a relatively short time (about 1 minute),
this is useful when performing waterproof inspections on a large volume of watches.
However, this instrument is more expensive than water resistant testers.
And the location of the defective water resistance cannot be determined with this instrument alone.
In order to determine the location of a leaking in, it is necessary to perform a waterproof inspection
using a water resistant tester.
The following is the instruction of one of the air leak checker WPC-8002 which is delivered by CASIO.
WPC-8002 measure the air leakage of the watch by using the sensor which detects the glass defor-
mation.
Tool used
1) Turn the power switch on.
After the power on, wait for 3 minutes for warming up of the circuit to keep the sensor accuracy.
2) Place the watch on the support.
3) Press down the head onto the center of the watch glass.
4) Turn the clamping screw to clockwise to fix the head.
On this time never turn the Clamping screw with too much force.
5) Close the capsule.
6) Turn the clamp to the end to fix the capsule.
7) Set the hand of the indicator at zero position by turning ZERO ADJ.dial.
Then READY lamp will be lit.
8) Turn START switch on.
Continuously press down the START switch until the air pressure is increased to 5 bar.
Note: In case the START switch is released before the air is increased to 5 bar, press down RESET
switch and start again from zero bar. Never press the START switch on the halfway.
9) Release the START switch when the hand of the pressure gauge reaches at 5 bar.
NO.
Code No.
Tool name
1
1904 5225 Water resistant tester
2
1901 9710 Waterproof checker
3-1 1901 9712 Air compressor (100 V)
3-2 1901 9711 Air compressor (220 V)