Today, the rugged tablet is commonly used across sectors like manufacturing, oil and gas, healthcare, defense, energy/utilities and more. One key performance parameter in these environments is ingress protection (IP) rating – resistance to ingress of dust and water into the device. For business-critical operations, the best rule of thumb is to always err on the side of caution and choose a rugged tablet with at least an IP67 rating. Most companies will ask why this is the case, and the answer lies in an understanding of the IP rating system and what protection an IP67 rated device will bring.
Although we’ve discussed the importance of IP67 or IP68 rating for a rugged tablet, many businesses miss the importance of having a device that is purpose built and tested for this rating. Although many manufacturers of add-on protective outer cases say that their products will protect the average consumer-grade OEM Android tablet in the same way, that is only potentially true under narrowly defined parameters and may require user cooperation.
Revisiting the Practicality of IP Ratings
The International Electrotechnical Commission (IEC) is the organization that sets the international standards and assessment for electrotechnology fields. The IEC ingress protection (IP) rating, governed by standard IEC 60529, is made up of the first digit which indicates its resistance to solids like dust, and a second digit that indicates its resistance to water. The higher the ratings numbers earned by a device the greater the ingress protection. A summary of the ingress protection ratings is located here.
In the IP rating, the solid ingress rating indicates the maximum diameter of solid particles that can enter the device. For example, a solid ingress rating of 4 indicates a maximum entry diameter of 1 mm – protection from large objects but no protection from dust and dirt particles that can enter the device at connection and seal points around screens and other areas. A rating of 6, the maximum, indicates complete protection against "harmful" dust or dirt seeping into the unit after being in direct contact with the matter for eight hours or more, under vacuum. Field service, manufacturing, and industrial environments will all naturally have a high degree of dust and dirt, so the high rating of 6 in the IP67 rating is a must have.
The water ingress rating is highly variable. Lower numbers (1 to 3) indicate protection against dripping or spraying from certain directions. Level 4 indicates protection from splashes from any direction. A rating of 4 might seem adequate in many circumstances. However, high powered directional sprays or immersion of the device within a liquid, even if unlikely, will be destructive to electronics. Therefore higher liquid ingress ratings (such as 5, 6, or 7) are critical for reliable tablet operation in deployed or mission critical circumstances. A rating of 7 is earned by a device capable of being submerged under water for 30 minutes at a depth of 1 m without adverse operational effects. It may seem like the higher rating of 7 would be unnecessary for anyone not working around large amounts of water on a regular basis, but that is the wrong way to look at it.


Contact Details:
InHand Electronics, Inc.
Address: 30 West Gude Drive- Rockville, Maryland, 20850, USA
Phone No.: 240-558-2014
Email: rfeldman@inhand.com