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Old 03-25-2012, 04:28 PM
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Originally Posted by Joelk
Perhaps your design is different, but the leakdown tester I have, and others I have seen used, work on the percentage difference between the guages.

If the one guage reads 100 PSI and the other 90 PSI, that is 10% leakdown.

If the one guage reads 120 PSI and the other 90 PSI, that is 25% leakdown.

The instructions with my leakdown tester recommend setting the one guage at 100 PSI to keep the math simple.
Thats correct. The 2nd gauge reads the % of leakage based on the supply psi. 90/100= 10% 67.5/75= 10% 45/50=10%
Use whatever air pressure YOUR system can maintain.
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