Metrohm 800 Dosino - Manual (Page 42)

7.1 Problems ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
34 ￭￭￭￭￭￭￭￭ 800 Dosino
Problem Cause Remedy
4. Place the dosing unit with Dosino attached
upright on the distributor, align marking rib
to marking rib, and rotate the dosing unit
to the left until the spring clip snaps audibly
into place. Now you should be able to
remove the Dosino from the dosing unit.
￭ You can also dismantle the dosing unit
directly by positioning the dosing buret
without distributor upright on a table top
and removing the dosing drive. Once you
have removed the housing from the dosing
unit, the interior part of the dosing unit,
along with centering tube and cylinder,
etc., will be freely accessible. Afterwards,
reassemble the dosing unit in accordance
with the instructions (see manual for the
dosing unit).
￭ If the stopcock can no longer be rotated or
if the piston does not move properly into
zero position, then the dosing unit must be
disassembled by a Metrohm Service Point
specialist. Improper opening of a dosing
cylinder filled with chemicals could damage
the dosing unit and/or the dosing drive.
The housing of the dosing drive is not per-
mitted to be opened, because the of the
dosing drive is readily vulnerable to
mechanical damage.
The drive pin on the
dosing drive rotates
without interruption The electronics of the Dos-
ino are damaged. Send the dosing drive in to the Metrohm Serv-
ice Point for repair.
The entire system is
blocked An exceptional error has
occurred on the Dosino or
the control device. ￭ Check the cable connections
￭ Switch the control instrument off and on
again.
￭ Remove the dosing drive from the dosing
unit. Check whether the drive pin of the
dosing drive can be rotated when the
device is switched on. – If it can, then it is
defective. – If it cannot, then disassemble
the dosing unit. Clean the black valve disc
in the base of the cylinder (see manual for
the dosing unit).