Water-Resistance & Chronometry Testing

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Categories: Innovation
"Ensuring optimal performance from in all Hublot watches."
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Ensuring that every Hublot performs flawlessly

Ensuring that every watch that comes out of the manufacture performs optimally, Hublot subjects each and every watch and movement to rigorous testing methods.

Water-Resistance

Testing the water-resistance of a watch begins by taking assembled cases void of their movements, where they are inserted into a “wet pressure” testing machine that simulates the underwater pressures at different depths; typically between 5 and 10 bars. For watches like the Oceanographic 4000 that boast a much greater depth rating, a dedicated machine is called for to reproduce the pressure found at 4000 meters underwater.

Once the first round of water-resistance testing is completed, the cases are tested for moisture. Using a dedicated metal “hot-tray”, the watch cases are placed on metal disks that are pre-heated to 55˚C, then rapidly cooled to around 15˚C. If condensation occurs on the interior side of the sapphire crystal, it indicates that there is a leak in the case or trapped humidity inside it.

The tested watch cases are then returned to the assembly department to be fitted with their respective movements. A final water-resistance test is conducted in a high-tech vacuum that helps not only determine if there is a leak or weak point but also point it out which component is suspect.

Chronometry

Once a movement is fully assembled by a watchmaker, it is taken to the chronometry department. The movements are tested by first winding the watch for approximately 2 hours then letting the watch run in a fixed position for 45 minutes. This is to ensure that the movement is operating at a standard rate when being tested.

Because the wrist constantly moves in different directions, watches are tested in a total of 6 positions to replicate the movements of the arm and wrist and determine the movement’s rate, beat and amplitude.

After the movement is tested in all 6 positions and the results are collected, the watchmaker can calculate the average daily rate. By Hublot’s standards, the acceptable rate for a movement is between 0 to +10 seconds change per day. If it gains more than 10 seconds per day or loses any time at all, the movement is sent back to the watchmakers for recalibration or reassembly; ensuring an optimal performance from all Hublot watches.

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