Helium and
leak
detection:
which purity
?
Helium is available in many different purity
levels,
the
highest
level of
purity is
requested
from
some
laboratories for
fundamental
activities or
very accurate analyses.
The use
of the Helium as a tracer gas into a
mass
spectrometer
doesn’t require
such
attention. A purity in the range of 97 % to 99 %
is enough
.
There
is
absolutely
no risk of accuracy lost or contamination for the
cell analyzer by using standard purity level of Helium gas.
Hydrogen
Hydrogen (H
2
) is the
lightest element,
has a
gaseous
specific gravity
of 0.0695 and a boiling point of -423 °F (-252.8 °C) at atmospheric
pressure.
It is a
colorless, odorless, tasteless,
flammable gas found at
concentrations
of about 0.0001 % in air. Hydrogen is produced by
several methods,
including
steam/methane
reforming, dissociation
of ammonia, and recovery from
by-product streams
from chemical
manufacturing
and
petroleum
reforming. Hydrogen can be stored and
transported
as a gas or a cryogenic
liquid.
Hydrogen is flammable in the
concentration
range 4 % to 75 % in
air or oxygen and can detonate in the range 18 % to 60 % in air or
ox
ygen
.
2
/2
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