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A common leak detection method utilizes a sniffer leak detector to locate leaks in a part or system that is pressurized with a tracer gas (usually helium). While very useful in pinpointing the location of a leak, sniffer detectors are not as reliable in quantifying leaks. However, with a properly calibrated sniffer leak detector, a reasonable estimate of the size of the leak can be made.
A calibrated helium leak standard can be used as a reference leak source for calibrating a helium sniffer leak detector. The leak rate of the leak standard is normally designated to be at or near the leak reject limit of the part being tested. A leak standard is also useful for regularly verifying that the sniffer detector is functioning properly.
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