| Abstract: | A method of detecting leaks and measuring volumes as well as a device,
the Power-free Pump Module (PPM), provides a self-contained leak test and
volume measurement apparatus that requires no external sources of
electrical power during leak testing or volume measurement. The PPM is a
portable, pneumatically-controlled instrument capable of generating a
vacuum, calibrating volumes, and performing quantitative leak tests on a
closed test system or device, all without the use of alternating current
(AC) power. Capabilities include the ability is to provide a modest
vacuum (less than 10 Torr) using a venturi pump, perform a pressure rise
leak test, measure the gas's absolute pressure, and perform volume
measurements. All operations are performed through a simple rotary
control valve which controls pneumatically-operated manifold valves. |