Alcatel Helium Mass Spectrometer leak detector for Vacuum and Sniffing Applications. Several models to choose from for your application. A new generation portable helium leak detector the ASM 142 has been designed specifically for heavy usage under very harsh industrial environments. It requires little maintenance and its internal layout allows easy access to all the components. The ASM 142 can be delivered with several options and accessories, including: interface board. ASI 20 MD Advanced Modular helium Leak Detector systems for industrial applications. The ASI 20 MD is ideally suited for easy integration into any leak detection system, including hard vacuum and sniffing tests.