Weighing of membrane size : 0.8 micron x 25 mm Dia Say: 17 mg (a) – approx Assembly the glass apparatus as shown in the above figures Take 17 ml of oil and add 35 ml of cleaned benzene and stir....
Weighing of membrane size : 0.8 micron x 25 mm Dia Say: 17 mg (a) – approx
Assembly the glass apparatus as shown in the above figures
Take 17 ml of oil and add 35 ml of cleaned benzene and stir well for diluting
Switch on vacuum pump and pour this diluted oil in graduated glass cylinder
Take another 16 ml of oil and add 35 ml of cleaned benzene and stir well for diluting pour the same. So, total 33 ml of oil has passed through the membrane.
Now weight the membrane. Say: 20 mg (b) ue. (b) – (a) = contamination / 33 ml. 20 mg – 17 mg = 3 mg / 33 ml as per NSA 1638, Contamination level to be checked in 100 ml of oil so, multiply by 3. i.e. 3 mg x 3 = 9 mg & 33 ml x 3 = 99 ml. (100 ml) so, contamination level is 9 mg / 100 ml.
Paste this patch / membrane on test report. By using transparent tape.
Match with given photography of membrane patches in catalogue. The patch at the beginning of the cleaning cycle will be brown/brown yellow and tends to get lighter in subsequent patches. The oil is totally cleaned when the original white color of membrane. To know the maximum size of the particle / contaminant, the patch can be observed under a microscope.
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