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Gas consumption/ environmental control problems
Bugbox Ax is fitted with a gas demand indicator (item 7 in Figure 7). The indicator illuminates when
gas is injected into the workstation chamber. When the workstation is at rest, the gas demand
indicator should illuminate once every 20 minutes. At rest is defined as the workstation chamber
is in an anaerobic condition with no access to the interlock chamber, i.e. the glove ports are closed,
the interlock is closed and, if fitted, the SPES is closed. Figure 36 gives some common gas
consumption and environmental control problems and solutions;
Figure 36: Gas consumption/ environmental control problems and solutions
Problem
Cause
Solution
The workstation is failing to
reach
an
anaerobic
condition.
The catalyst sachet has
not been installed.
The catalyst sachet needs
replacing.
The anoxic mixed gas
supply has run out.
Install a catalyst sachet. See
section 9.2.1 for more details.
Replace the catalyst sachet. See
section 9.2.1 for more details.
Replace the anoxic mixed gas
cylinder.
High gas consumption when
at rest.
The glove port cover has
been left open.
The SPES has been left
open.
The interlock inner and
outer doors are both open.
Close the glove port cover.
Close the SPES. See section 8.7.1 for
more details.
Close the interlock inner and/ or
outer door.
High gas consumption when
in use.
The Ezee Sleeves have not
been correctly fitted.
The Ezee Sleeves are not
sealing around the users
wrists.
Refit the Ezee Sleeves.
Ensure that the Ezee Sleeves are the
correct size for the user. Ensure that
any clothing and/ or jewellery that
may foul the Ezee Sleeves is
removed/ rolled back. Ensure that
the Ezee Sleeves are pulled tight
around the user’s wrists.
The N
2
low indicator is
illuminated.
Low pressure in the
nitrogen supply caused by
an
empty
nitrogen
cylinder.
Replace the nitrogen cylinder,
check
connections
between
canister and canister head for
leaks.
The ANO
2
low indicator is
illuminated.
Low pressure in the anoxic
mixed gas supply caused
by an empty nitrogen
cylinder.
Replace the nitrogen cylinder.
An audible alarm can be
heard.
Low pressure in the gas
supply, caused by an
empty gas cylinder.
Replace the empty gas cylinder.
The alarm can be muted by
pressing the gas alarm switch
(item 3 in Figure 7)
