How does a pressure test work?

[Feelix]

Just curious; what is the pressure test procedure/process? Do they put the watch in some sort of pressurized chamber? Surely they don’t put it in a water-filled pressurized chamber....that seems dumb. How do they do it?

Thanks in advance for the insight. Drop some knowledge on a relative rookie if you have a minute.

[kieselguhr]

Here you go OP

https://www.hodinkee.com/articles/un...stance-testing


AOW

[othertbone]

Originally Posted by kieselguhr

Here you go OP

https://www.hodinkee.com/articles/un...stance-testing


AOW

Great article!

[Jona]

Originally Posted by kieselguhr

Here you go OP

https://www.hodinkee.com/articles/un...stance-testing


AOW

This test was done at my AD!!

[Tools]

Originally Posted by Feelix

Just curious; what is the pressure test procedure/process? Do they put the watch in some sort of pressurized chamber? Surely they don’t put it in a water-filled pressurized chamber....that seems dumb. How do they do it?

. . .

Yes, they do.

The watch is above the water, then the chamber is pressurized. If there is a leak in the watch, the inside of the case becomes positively pressurized through that breach.

They then slowly release the pressure and lower the watch into the water. The positive pressure inside the watch will push out causing bubbles.... no water will push past (because water cannot be compressed) into the watch.

It's physics...

[MSchu]

I didn't read the hondinkee article, but the sealed empty watch case is suspended in the air space of a fluid filled chamber at room pressures, then slowly the pressure in the chamber is raised to 60-65 psi... after a short period the watch is lowered into the fluid and the inspector watches for air bubbles seeping out from the case assembly. It's that simple.

[TreiseKL]

[scurfa]

I have a dry one, the built in compressor tries to force pressure into the watch, then tries to draw pressure out, other factors can cause a failure like rubber straps and case back stickers



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[bob78h]

There is also a dry test which I believe measures the deflection of the crystal. If you're not sure the watch will pass, always better to do the dry test first.