Metrohm 743 Rancimat User Manual
Page 173
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6 Troubleshooting
743 Rancimat
￭￭￭￭￭￭￭￭
165
Problem
Cause
Remedy
No air flow can be
detected in the
measuring vessel (it
does not bubble),
although an air flow
can be discerned in
the reaction vessel.
The connection is blocked.
￭
) on the reac-
tion vessel cover for blockages and, if nec-
essary, clean.
￭
) for blockages
and, if necessary, clean.
￭
Check tubing adapter (5-
) and PTFE
tube (5-
) on the measuring vessel cover
for blockages and, if necessary, clean.
The connection is leaking.
Check silicone tubing (5-
) for leakages and, if
necessary, replace.
The reaction vessel cover
(5-
) is not mounted cor-
rectly or is too loose.
￭
If the reaction vessel cover is oblique or not
completely mounted, press down as far as
the limit stop.
￭
If the reaction vessel cover is loose on the
reaction vessel despite correct assembly,
the cover has to be replaced.
The connection is wrongly
connected.
￭
Ensure that the PTFE tube (5-
) is moun-
ted to the air supply at the opening In
(5-
) of the measuring vessel cover.
￭
Ensure that the silicone tubing (5-
) is
mounted on the tubing adapter, which is
mounted in the opening In (5-
￭
Ensure that the reaction vessel is connected
to the measuring vessel belonging to the
corresponding measuring place.
The conductivity is
displayed in the
upper part of the
Live window during
startup.
The conductivity of the
water used is too high.
Check the conductivity of the water used and,
if necessary, use deionized water from another
source.
The conductivity measuring
cell is contaminated.
Check cell constant of the measuring cell. The
cell constant should be between 1.0 and 1.2.
If this is not the case, the measuring cell must
be cleaned (see Chapter 4.6.5, page 83).
The induction times
are not reproducible
for multiple determi-
nations.
The reaction vessels used
are not clean.
￭
Free the reaction vessel of particles (dust,
cardboard, glass fragments etc.) with com-
pressed air before weighing in the sample.
￭
Only use new, unused reaction vessels.