Bubble point method test principle: when the membrane and filter the solution with a certain completely infiltration, and then through the air in the side of the pressure (we instrument inside inlet control system, stable pressure), regulating air), with the increase of pressure, the gas released from the membrane side, the film side size, ranging from the number of bubbles through the instrument, to determine a corresponding pressure value is bubble.
Diffusion flow testing principle: diffusion flow testing is that when the gas pressure in the filter bubble point value of 80%, had not yet emerged a large number of gas holes, only a small amount of gas dissolved in the liquid phase of the first diaphragm, then from the liquid phase diffusion to the other side of the gas phase, the gas is called for the diffusion flow.
Why the diffusion flow method is better: bubble point value is only a qualitative value, from the beginning to the final group of blistering blistering is a long process, not an accurate quantitative. The measurement of diffusion current value is a quantitative value, integrity can not only determine the accuracy of the filter, but also reflect the membrane porosity, flow rate and the effective filtration area and other issues, and this is also the reason why foreign manufacturers are used to test the integrity of diffusion flow.
Water invasion test principle: the water invasion method is specially used for the test of hydrophobic filter, hydrophobic membrane resists water, the smaller the pore size, the greater the pressure required to squeeze the water into the hydrophobic membrane. So under certain pressure, measure the water flow into the filter membrane to determine the aperture of the filter element.
Installation attention
Steam or gas pipeline: strainer horizontal;
Liquid piping: strainer down installation;
Vertical installation: according to the filter installation direction.