The Sensistor 9012 uses 5% hydrogen/95% nitrogen as
the tracer gas injected into the part at a positive pressure. This 5%
hydrogen mixture is completely non-combustible (green label) and safe
for use. At 5%, hydrogen in nitrogen will not ignite or burn. Reasons to
use hydrogen over other gases such as helium are:
1. Cost of 5/95 is a quarter the cost of
helium
2. The hydrogen gas dissipates after it
comes out of the leak quickly to provide a clean environment to test.
3. 5% hydrogen/95% nitrogen is non-toxic
and environmentally friendly gas.
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