DESCRIPTION
The test part is pressurized with Helium in a simple accumulation chamber which is under atmospheric pressure. After an accumulation time, the detector analyzes the air inside the chamber and determines if an increase in the tracer gas concentration can be measured.
With hydrogen, helium, and many other tracer gases you always have a natural background signal.
So with this accumulation method you need to diene the concentration rise you consider as safe for the respective process.
It is important to keep the volume which collects the tracer gas as small as possible. The smaller the volume the safer the measurement and the less time you need.
