Integrity Testing Introduction
{"Image DocumentName": "Integrity Testing Introduction", "Image ImageDescription": "This is a simple pressure-hold or vacuum-decay test designed to identify gross defects in the membrane, or element/device seals. General. The test requires that the membrane be both fully wet-out (all pores full of water) and is more sensitive if the device is drained. The more parts of the entire device that is tested, the better \u2013 in order to include seals as potential source of leaks. This test does not require the visual detection of a bubble, instead it measures the loss of pressure or vacuum over time via a gauge. A certain amount of pressure loss will occur in an intact system from simple diffusion of air through the water trapped in the membrane pores ( baseline decay ). But much more will occur from membrane flaws or broken seals. A rapid loss compared to an integral device is the indication of a leak. Standard values for leaks and baseline decay should be set with experience. The procedure below covers only positive pressure use, but is easily modified to allow vacuum use. Vacuum instead of positive pressure allows testing of devices with only one side drained. Vacuum use also reduces chance of contamination by materials or microbes in the pressurized air. To prevent contamination, use either a clean air source or a 0.2 micron filter on the air source.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}