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It depends on the way you do the test. If you move the sensor probe along the surface of your test object you can detect leaks down to 5 x 10E-7 cc/s (equivalent to 0.1 g/y refrigerant gas). If you use a clam shell type of arrangement (locally enclosing the test point) you may detect leaks down to 2.5 x 10 E-6 (equivalent to 0.5 g/y refrigerant). If you need to do an integral test on the entire object in order to detect leaks from anywhere on the object you will have to use an accumulation chamber. The sensitivity will then be proportional to the time you allow gas to accumulate in the chamber and inversely proportional to the air volume into which the gas spreads.
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