The smallest leaks are unacceptable with natural gas vehicles (NGV) fuel systems, so traditional leak testing approach is helium mass spectrometry. Good and expensive, it achieves results worthy of its reputation for stringent tolerances, but now specialized mass flow sensors provide alternative testing methods and major cost savings.
InterTech Development Co., Skokie, Ill., offers patented leak testing technology for sensors used in helium mass spectrometry and in mass flow dry air testing. Application considerations for both methods are described in a new design report from InterTech: DR-134.
“We are at a crossroads for extreme leak testing technology,” said Mr. Jacques Hoffmann, president of InterTech. “Helium shortages are common and prices are on the rise. Natural gas is abundant and inexpensive and the trend is for more NGVs. Helium testing is expensive, especially if there are supply chain disruptions, which is why for many companies, ‘micro flow’ mass flow systems are on the short list of leak testing alternatives.”
Breakthroughs in mass flow sensor technology provide cost savings and superior performance. This patented sensor technology is some 10,000 times more sensitive than commercial off-the-shelf mass flow leak sensors. Compare resolution capabilities: 1.0 sccm for generic mass flow sensors versus 0.01 sccm for mass flow sensors.
The unique resolution capability of these sensors makes it possible to use this more economical method to leak test NGV fuel system components and other applications with extreme requirements. When only helium will do, state-of-the-art helium mass spectrometry equipment and decades of automotive experience is offered to engineer the most cost effective and efficient leak testing system.
DR-134 today, which explains specific issues and options for NGV fuel system leak testing is available. Real-world examples take the mystery out of application possibilities, and important considerations such as automatic temperature compensation are explored in this report.
More informations:
InterTech Development Co.
