When leak testing a part with a large volume under low test pressure, it is often observed that the pressurization capacity of the leak tester is not good enough, resulting in an extended amount of test time.

In such cases, use of the external bypass circuit helps to shorten the pressurization time or overall test time and improve the leak test accuracy. LS-1842 and LS-1880 are capable of controlling such external WV series bypass air valve circuit unit.