HACH LANGE ORBISPHERE 3654, User Manual, Page: 48 / 58

46
Maintenance and Troubleshooting
8.4.1 N
2
Purge gas
Fill the
N
2
purge gas cylinder
to a maximum of 200 bar from a master N
2
storage cylinder,
using fittings supplied with the analyzer.
CAUTION
Although N
2
is not toxic, it is asphyxiating. Therefore, filling should be carried out in a
ventilated place and leaks should be avoided.
Note:
Do not attempt to refill the analyzer purge gas cylinder if the master N
2
storage cylinder pressure is
below 100 bar. When the master cylinder is below this pressure, refill or replace the master cylinder.
8.4.2 CO
2
Purge gas
Fill the
CO
2
purge gas cylinder
to a maximum of 57 bar (liquid phase at 20°C) from a master
CO
2
storage cylinder equipped with a plunger tube, using fittings supplied with the analyzer.
WARNING
CO
2
is toxic, asphyxiating, and heavier than air. Therefore, filling should be carried out in
a ventilated place and leaks should be avoided.
8.4.3 Filling the purge gas cylinder
The process for filling the purge gas cylinder is identical regardless of which purge gas you are
using. For important information relevant to the different purge gases, refer to the two sections
above.
Refill the purge gas cylinder in a clean and dry area as follows, referring to the illustration in
Figure 12 on page 45 for more information:
1.
Connect the
refilling hose
(model 32824A) to the
master storage cylinder
.
2.
Close the
bleed valve
on the
refilling hose
.
3.
Carefully, open the
main valve
on the
master storage cylinder
.
4.
Close the
main valve
on the
master storage cylinder
.
5.
Open the
bleed valve
on the
refilling hose
to purge the hose.
6.
Close the
bleed valve
on the
refilling hose
.
7.
Remove the
protection cap
from the instrument base.
8.
Connect the
refilling hose
to the instrument. This is a push-on connector, so make sure
that the connector clicks into the instrument fitting.
Note:
Position the instrument below the outlet of the
master storage cylinder
.
9.
Carefully open the
main valve
on the master cylinder and wait about 30 seconds for the
refilling process to finish.
10.
Close the
main valve
on the
master storage cylinder
.
11.
Open the
bleed valve
on the
refilling hose
to purge the hose.
12.
Carefully, disconnect the
refilling hose
from the instrument by sliding the
hose attachment
in the direction shown (toward the instrument) and pulling back the connector.
13.
Replace the
protection cap
on the instrument.