Metrohm 806 Exchange Unit - Manual (Page 35)

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6 Troubleshooting
806 Exchange Unit
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6 Troubleshooting
6.1 Problems
Problem Cause Remedy
Air bubbles in the
cylinder or in the
dosing tubing Leaking connection ￭ Check the ends of the tubing, in particular
that of the aspiration tubing.
￭ Tighten all of the tubing connections with
the wrench 6.2739.000.
￭ Check the locking mechanism of the hous-
ing. Suggestion: Remove the housing and
then reattach it.
The reagent degasses
excessively, e.g. released
air forms bubbles. ￭ Carry out [PREP] / [Preparing]
￭ Reduce the filling rate.
￭ Suggestion: Degas the reagent with ultra-
sound, nitrogen or in a vacuum.
Wear Replacing piston and cylinder.
[PREP] / [Preparing] is
not carried out or false
parameters- ￭ Carry out [PREP] / [Preparing]
￭ Correct tubing length and diameter.
An incorrect volume
is dosed Dosing unit either mounted
or assembled incorrectly. ￭ Remove the dosing unit and then reattach
it.
￭ Check whether the nominal volume on the
housing and the effective cylinder volume
match one another.
Data of the dosing
unit cannot be read. Data chip of the dosing
unit mechanically dam-
aged or impaired by chem-
icals. ￭ Remove the dosing drive and set it up
again.
￭ Clean the data chip and the contact sur-
faces.
￭ Have the data chip replaced by the
Metrohm Service Dept.
Exchange unit rec-
ognized either not
at all or incorrectly. The exchange unit has not
correctly been attached. ￭ Remove the exchange unit and set it up
again.
￭ Check the correct placing of the exchange
unit.
￭ Check the piston and flat stopcock posi-
tion.
￭ Switch the instrument off and on again.