Bugbox Plus
UM-17 R4.0
Page 44 of 47
Bugbox Plus User Manual
Gas consumption/ environmental control problems
Bugbox Plus is fitted with a gas demand indicator (item 7 in Figure 9). 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 37 gives some common gas consumption
and environmental control problems and solutions;
Figure 37: 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 anaerobic mixed gas supply
has run out.
Install a catalyst sachet. See section
7.2.3, for more details.
Replace the catalyst sachet. See
section 7.2.3, for more details.
Replace the anaerobic 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 6.5.1.1,
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. See section
7.2.2, for more details.
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.
The
ANO
2
low
indicator
is
illuminated.
Low pressure in the anaerobic
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 9).
