Gebe, Gary L. (1990, ASQC) Cincinnati Test Systems, Inc., Cleves, OH
Leak test instruments either determine if a leak is tolerable or identify the location of a leak. The former type is appropriate in medium- to high-volume applications, while the latter is cost-effective in low-volume production. To determine if a leak goes beyond a tolerable level, there are pressure decay, mass flow, and helium mass spectrometry devices. They have minimum reject leak rates of 0.1 to 0.5; 0.5 to 2; and 0.0003 to 1 sccm (standard cubic centimeter per minute) of air, respectively. For locating a leak, there are bubble/dunk tank leak systems; halogen tracer gas analyzers (with optimal sensitivity of 0.0006 sccm); helium mass spectrometers with sniffer probes (0.0006 sccm); and ultrasonic detectors (0.1 sccm). Selection factors for a leak detection instrument include test pressure, reject leak rate, production rate, and test environment. Following the article is an equipment overview of 21 leak detectors and related devices.
Inspection,Testing,Technology,Standards and specifications