Why Some Water Resistance Ratings Have Time Limits: Explained
Water resistance ratings are essential for understanding the durability of electronic devices like smartphones, smartwatches, and cameras. However, it's a common misconception that these ratings indicate indefinite protection. In reality, these ratings are based on specific, standardized testing protocols that involve defined time limits. Let's explore why these time limits are necessary and what they mean for consumers.The Importance of Time Limits in Water Resistance Ratings
When a company claims an IP (Ingress Protection) or ATM (Atmosphere) rating, it means they have tested the product under controlled conditions. These tests help ensure that the devices can withstand various levels of water exposure. However, it’s impractical and scientifically meaningless to leave a device submerged in water indefinitely. Therefore, a specific period of time is built into the definition of the water resistance ratings. For instance, an IP67-rated device can withstand immersion in water for 30 minutes at a depth of 1 meter. This test does not imply that the device can stay underwater for 30 days, only for 30 minutes. This period is crucial because it reflects the intended usage of the device without overpromising its capabilities.Understanding IP Ratings
IP ratings are composed of two digits. The first digit relates to dust protection, while the second digit indicates water resistance. The IP68 rating, for example, denotes complete protection against dust and sand, as well as being able to be immersed in water deeper than 1 meter for varying periods depending on the manufacturer. IPx8, which is often seen as the catch-all for water resistance, indicates that the device is better than an IPx7 rating. This means it can withstand submersion deeper than 1 meter for longer periods. However, this does not automatically make a device completely waterproof. Instead, it provides a higher level of water resistance beyond what is required by IPx7.Practical Examples of Water Resistance Ratings
Several devices represent the typical range of water resistance ratings. For example, the Cubot King Kong 3 smartphone is rated IP68 and specified to be water-resistant at 1.5 meters for 30 minutes. Similarly, the Blackview BV9100 and the iPhone 11 Pro are also rated IP68, but their specifications state water resistance at 5 feet for an hour and 4 meters for 30 minutes, respectively. These ratings reflect the real-world water resistance expectations. The IP specification is mainly for devices that are not typically submerged but may encounter water occasionally. For instance, digital multiband network radios designed for outdoor use often have IP67 ratings, meaning they can withstand immersion in water up to 1 meter for 30 minutes.Water Resistance in Wearable Devices
Some devices like smartwatches are designed to be water-resistant for everyday use. The Honor Magicwatch 2 is rated 5ATM, which means it can withstand immersion in water to a depth of 50 meters. However, this rating often doesn’t include a specified time limit, as the device is meant for wear in everyday situations, such as showering or swimming, rather than deep-sea diving.Waterproofing Cameras and Other Devices
Cameras and other devices that are explicitly designed for underwater use have more robust water resistance ratings. For example, the Nikon AW1 is rated for water resistance up to 15 meters without additional protection. This is a practical limit for underwater photography without specialized housing. Similarly, the Olympus TG-5 is water-resistant to 15 meters, providing excellent protection for point-and-shoot cameras.Conclusion
Water resistance ratings are based on practical, test-driven specifications. While these ratings provide valuable information about a device’s durability, they do not guarantee indefinite protection. Consumers should be aware of the specific time limits associated with the ratings to ensure they get the most out of their devices in various water-related situations. Whether you're using a smartphone, smartwatch, or camera, understanding these ratings will help you make informed decisions and protect your devices effectively.Frequently Asked Questions (FAQ)
Q: What does IP68 mean?
IP68 is a water resistance rating that signifies complete protection against dust and sand, as well as the ability to be immersed in water deeper than 1 meter for a specified period, often 30 minutes. This rating is higher than IP67, offering greater water resistance.
Q: What is the difference between IPx7 and IPx8?
IPx7 devices can be submerged in water up to 1 meter for a certain period, often 30 minutes. IPx8 is a catch-all rating for devices that offer water resistance better than IPx7, usually allowing deeper submersion for longer periods.
Q: How can I maintain the water resistance of my device?
Maintaining water resistance involves regular checks of seals, replacing O-rings as necessary, and keeping all openings clean and lubricated with silicone grease. It's crucial to follow manufacturer guidelines to ensure your device remains protected.