The IP dustproof and waterproof rating defines how much mechanical and electronic equipment can provide protection against solid foreign objects (including body parts such as fingers, dust, gravel, etc.), liquid penetration, and accidental contact. Generally, it is expressed by IP plus two digits. The first digit indicates the dustproof capability, and the second digit indicates the waterproof capability. The larger the number, the stronger the capability.
Representation: IPXX (IP + dust-proof grade number + waterproof grade number)
The dustproof and waterproof performance is indicated by numbers. The larger the number, the stronger the protection.
0 No protection Not protected at all
1 Prevent the intrusion of particles larger than 50mm
2 Prevent the intrusion of objects larger than 12mm This is the lowest level to prevent the entry of fingers
3 Prevent the intrusion of objects larger than 2.5mm
4 Prevent intrusion of objects larger than 1.0mm
0 No protection No special protection 1 Prevent dripping Prevent vertical dripping
2 When tilted from a normal position at an angle of 15 degrees, prevent dripping water 3 When tilted from a normal position to an angle of 60 degrees, prevent rain or water spray
4 Prevent splashing at any angle
5 Prevent water from being sprayed from 6.3mm nozzle at 12.5L/min and 30kPa from three meters away for three minutes
6 Prevent water from spraying from 12.5mm nozzle at 100l/min and 100kPa from three meters away for three minutes
6K prevents water from being sprayed from 6.3mm nozzle at 75l/min, 1000kPa pressure from 3m away for 3 minutes
7 Prevent 1 meter from invading the water under normal pressure for 30 minutes
8 Prevent sinking and intrusion (prevent immersion in one or deeper water under the specifications detailed by the manufacturer)
9K Prevent water pressure 80-100bar or water temperature 80 degrees Celsius from invading
For over-testing the waterproof performance of products, the more traditional method is to use water inspection. This method is undoubtedly the most reliable method, but its various disadvantages such as low efficiency, component pollution, subjective judgment, and inability to measure the leakage value make it unsuitable for batch testing and precision testing during online production. At present, most of the batch online testing of waterproofing products of electronic factories uses differential airtight leak detectors (also called waterproofing testers).
The differential pressure airtight leak detector uses compressed air as the detection medium, and fills the detection end and the standard end (full seal) with a certain pressure of gas. After equilibrating for a period of time, observe the pressure change at the detection end. When the end pressure is reduced, the airtight leak detector reads the pressure change through the differential pressure sensor, and through a series of algorithms (effectively eliminates the influence of deformation, temperature, etc. on the test result) and finally makes a judgment on the size of the leakage, according to the judgment standard Judge whether the workpiece is qualified or not.
Relative to the detection of IP waterproof rating, we can convert the water pressure into air pressure for testing according to the requirements of the IP rating standard. For example, the waterproof requirement of IP67 is 1 meter into the water, and the detection pressure of 10-15kPa is required for detection with an airtight leak detector. For higher-level IP68 testing, the specific testing requirements need to be established by the manufacturer, but the testing pressure must be greater than 10-15kPa.