Inspection Objects: Candle Filter
Principle:
Impregnation of a test piece(candle filter) with a test liquid. Immersion of the test piece in the test liquid and introduction of a gas (usually air) into the test piece at gradually increasing pressure. Determination of the pressure at which bubbles are emitted from the surface of the test piece. Evaluation of the equivalent bubble test pore size by means of a mathematical formula.
Bubble test pore size: The maximum equivalent capillary diameter in the test piece which is calculated from the measured minimum pressure required to force the first bubble of gas through the test piece (under standardized conditions) impregnated with a liquid.
Application:
1. Used as factory-entry quality detection for new filter
2. After the filter is used, whether it is damaged
Test Indicators:
1. First bubble point；
The bubble test pore size corresponds to the minimum differential pressure at which constant bubbling first occurs.
2. The uniformity of distribution of pores
As the gas pressure increases beyond the minimum bubble pressure (first bubble point), different aspects of bubbling occur on the test pores. The pressure for a given aspect can lead to the definition of a conventional pore size. For example, the pressure for which a generalized bubbling occurs is frequently specified (foaming over the whole surface). These particular definitions should be agreed between the supplier and the user. Moreover, the uniformity of distribution of pores approaching the maximum pore size may be observed by gradually increasing the gas pressure. Cracks and clogged areas are easily discerned by this operation.
Main Parts:
1. Transparent testing tank
2. Test frame with exhaust device
3. Liquid storage tank(IPA)
4. Drying rack for filter
5. Visual sliding door
6. Pneumatic lifting device for filter
7.Manual rotating device for filter
8. Automatic liquid feeding and discharging device
9. Detection device
10. Control Panel



Take Model: BPT-A as sample for certain details:
※Test Object
Candle Filter:φ35-60×425-1571mm
Filtering accuracy:5-60um
This agreement is made with φ60 ×1000mm, the accuracy of 40um as an example.
※Technology performance
1. It is controlled the filter into / out of the solution of IPA by cylinder, the operator does not need to be immersed in the IPA;
2. Digital display the bubble pressure and flow;
3. The equipment is equipped with automatic air exhaust device, It avoid the environmental pollution caused by the volatilization of the IPA;
4. The equipment is equipped the rotating device for filter, It can observe the filter bubble point at different angles.
5. The equipment is equipped the circulation filtration of IPA, extended IPA usage time.
6. The device is provided with visual sliding door, observation is more convenient
7. The equipment is equipped with a storage tank, after the test is completed, the test liquid is returned to the liquid storage tank;