When you’re exploring the wonders found in the alternate world of the sea bed, the last thing on your mind should be the reliability of your dive watch. So have you ever wondered exactly what the strict conditions are that dive watches undergo to ensure they really are waterproof?
Here we take you through the process of waterproof testing, as per the conditions of ISO 6425, for diving watches up to 1000m/100ATM.
A) Condensation Test
The watch is warmed on a heated plate to between 40°C and 45°C. A drop of water at a temperature of 18°C to 25°C is then placed on the watch glass. After about a minute, the glass is wiped with a dry rag. Any watch that has condensation on the interior surface of the glass is eliminated.
B) Resistance to Thermal Shock
The watch is immersed in 30 cm ± 2 cm of water for 10 minutes at 40°C, 5°C and 40°C again, each changeover being less than a minute. No evidence of water intrusion or condensation is allowed.
C) Reliability under Water
This test immerses the watch in water to a depth of 30 cm ± 2 cm for 50 hours at 18°C to 25°C, and checks for signs of water ingress afterwards. The condensation test described above is carried out both before and after this test to ensure its accuracy.
D) Resistance of Crowns and other Setting Devices to an External Force
In this test, the watch is subjected to an overpressure in water of 125% of the rated pressure/100 bar for 10 minutes and to an external force of 5 N perpendicular to the crown and any pusher buttons. The condensation test described above is carried out both before and after this test to ensure its accuracy.
F) Water-tightness and Resistance at a Water overpressure
In this test, the watch is immersed in water in a suitable vessel. Then an overpressure of 125% of the rated pressure is applied within 1 minute and maintained for 2 hours. After this, the overpressure is reduced to 0.3 bar within 1 minute and maintained at this pressure for 1 hour. The watch is removed from the water vessel and dried carefully with a rag. No evidence of water intrusion or condensation is allowed.