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Why use a reference volume for leak testing?

Engineering Asked by Oliver Walters on September 1, 2021

An accepted method of leak testing a test piece is by using a differential measurement between it and a reference such as in the schematic here – why might one bother doing this as opposed to just comparing your test piece alone to a predefined or recorded leak rate, or curve?

One Answer

Pressures change in a vessel based on ambient conditions. The reference volume removes that source of error.

Correct answer by Tiger Guy on September 1, 2021

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