43
5 Maintenance
5.1.4
Testing indication accuracy with supply of fresh air
The indication accuracy with supply of fresh air test is part of the
device inspection (see Section 5.1.1.1
).
The device inspection has been opened (see Section 5.1.2.1
).
1. Make sure that only fresh air is being drawn in.
2. Select
Fresh air
from the
Dev. Test ...
menu.
3. Wait until the displayed reading is stable. A
Status: OK
mes-
sage will appear.
4. Press
OK
to confirm.
Fresh air OK
will appear on the display.
If the
Status: OK
message does not appear within a reasonable
amount of time, the air inflow does not correspond to the limit
values stored in the device (see Section 7.3 on page 52
). Move
the device somewhere else and repeat the test.
If the
Status: OK
message still does not appear when the test
is repeated, the device must be re-adjusted (see Section 5.2
5.1.5
Testing indication accuracy with supply of test gas
The indication accuracy with supply of test gas test is part of the
device inspection (see Section 5.1.1.1
).
The following resources are needed for the test:
●
Test gas containing hydrogen (e.g. 5% H
2
in 95% N
2
)
●
Test set for the supply of test gas
Note:
Details of how to use the test set can be found in the accompany-
ing operating instructions.
The device inspection has been opened (see Section 5.1.2.1
).
1. Select
Test gas H2
from the
Dev. Test ...
menu.
2.
Check whether the test gas concentration specified by the
device matches the test gas you intend to use. To do this
press
Information
.
3. Add the test gas
