| Abstract: | A method of detecting leaks and measuring volumes as well as an
apparatus, the Power-free Pump Module (PPM), that is a self-contained
leak test and volume measurement apparatus that requires no external
sources of electrical power during leak testing or volume measurement,
where the invention 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), 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. |