4 Transport, installation and commissioning
Commissioning
MB-20-G/MB-200G-W_MB-LABmaster_MB-200 MOD_TP700
Operating Manual - V5.0 - 04/2018 - STD
Page
4 - 31
4.3.2 Inertisation of the glovebox
Newly installed or used inert gas systems contain ambient air. Before circulation through
an activated, and regenerated reactor can be switched on, the ambient air needs to be
replaced by the working gas. Displacing the ambient air from the system is called purging
or inertisation.
The system must be purged down to a residual oxygen concentration of approximately
100 ppm using medium-purity inert gas.
An inert gas system should always be purged when the oxygen concentration in the
glovebox atmosphere exceeds 100 ppm (V). An automatic box purge feature is available
as an option.
Exceedingly high oxygen concentration values can occur for the following reasons:
¡ Initial system commissioning
¡ Service work
¡ Air influx due to faulty operation
¡ Air influx due to damage (leaks)
Purge gas consumption
The operator must ensure that sufficient purge gas is available for system commission-
ing.
The figure below provides a guideline for estimating the amount of purge gas required.
gc Gas consumption c Gas purity
v Glovebox volume
According to the diagram above, if a purity (c) of 100 ppm (V) is requested, about 11.2 m
3
of purge gas is required per 1 m
3
of glovebox volume.
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