Correlating Gas Leakage Rates to Fluid Ingress in Sensor Seals
Correlating gas leakage rates to liquid ingress requires deriving equivalent pore radius to confirm capillary entry pressure exceeds target hydrostatic head.
IP68 Testing
Ingress Rating
Protection ratings for electrical enclosures define the resistance of a device to the ingress of dust and the effects of long-term immersion in water. The specific designation of ip68 testing requires the equipment to remain functional after being submerged deeper than one meter. Manufacturers and testing bodies agree on the exact depth and duration before the evaluation begins.
Test Condition
Submersion typically occurs at depths ranging from 1.5 to 3 meters for durations exceeding thirty minutes. The enclosure is placed in a pressure vessel filled with water to simulate the hydrostatic pressure found at the specified depth. Unlike lower ratings, this procedure allows for some water entry if the moisture does not interfere with the safe operation of the internal circuits.
Seal Performance
Success depends on the integrity of gaskets and the compression of the housing. Technicians often monitor the internal humidity or use a dye-trace liquid to detect any breach. Because the standard is open-ended regarding depth, the certificate must state the specific pressure and time used during the run.
Environmental Variable
Dynamic conditions like rapid temperature changes or chemical exposure are not covered by this standard rating. A device that passes in cold fresh water might fail in hot salt water due to the expansion of materials and the corrosive nature of the ions. The test also does not account for high-pressure jets or mechanical impact which can temporarily deform the seals and allow water to bypass the barrier.