Buchi DuMaster D-480, Operation Manual

Page: 246 / 354

Operating instructions DuMaster D-480 ©BÜCHI Labortechnik AG
9 - Repairing the instrument 246
What to do after a power failure
Depending on when the power failure occurred, proceed as follows:
Case Procedure
When the power failure occurred while you were
performing an analysis and there was a sample in
the analyzer.
Follow the instructions in "Reacting to a power
failure during analysis".
Although you were performing an analysis when
the power failure occurred, there was no sample
in the analyzer.
Follow the instructions in "Reacting to a power
failure".
The analyzer was in standby mode when the
power failure occurred. The power failure lasted
longer than 15 minutes.
Follow the instructions in "Checking the gas-
tightness of the instrument".
The analyzer was in standby mode when the
power failure occurred. The power failure lasted
less than 15 minutes.
No special measures required.
Reacting to a power failure during analysis
Please observe the following instruction:
Caution
Inserting multiple samples into the ball valve (only for
solid operation)
If there are samples in the carousel while you are changing the position of the
carousel via
System > Carousel position
, multiple samples may fall into the ball
valve at the same time. In this case, a service technician is required.
Before changing the position of the carousel, always remove all samples from the
carousel.
Proceed as follows:

If the analyzer is still switched on, switch it off and wait for a moment.

Switch the analyzer on again.
If the ball valve...

... audibly does perform a reference run: Go to the next step.

... ...does not perform a reference run: Disconnect the instrument from the mains, check the
fuses and replace them if necessary. See Replacing fuses. After replacing the fuse repeat
this step.

Restart the operating software. The temporary file of the most recent document is loaded.

All measuring results exist except for the most recent sample. A message appears which informs
that the sample position is not definied and a reference run has to be carried out.

Confirm this message by clicking
OK
. This displays the "Adjusting the carousel position dialog.

without removing the carousel, remove all remaining samples from the carousel. Confirm this in
the dialog by checking "All samples removed from carousel". Then move the empty carousel to
zero position ("Reference run" radio button). Cf.
Changing the position of the carousel
(on
page 249).

Create a backup of the current document via
File > Save as
.

Perform a leak test by selecting
Options > Diagnostics > Leak Test
.See Performing a leak test.
If a leak is identified, replace the sealing elements in the furnace area. See Replacing sealing
elements.

There may still be some residue of the last sample in the combustion section. Perform blank
value determinations to remove the residues. See
Determining blank values
(on page 141).

Correct the number of the current sample via
Edit > Current sample
. See Adjusting the current
sample.