Metrohm 800 Dosino - Manual (Page 41)

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 7 Troubleshooting
800 Dosino ￭￭￭￭￭￭￭￭ 33
Problem Cause Remedy
The Dosino cannot
be attached to the
dosing unit. Thedrive pin of the dosing
drive is misaligned. Switch the control instrument off and on
again. If the drive pin does not rotate into
starting position automatically at this time,
then switch the instrument back off again and
rotate the drive pin by hand into the correct
position. Note marking ribs. Rib to rib
The centering tube is mis-
aligned Rotate the centering tube of the dosing unit by
hand into the correct position. Observe the tri-
angle markings.
The dosing piston is mis-
aligned. The piston stopper
must be flush with the
housing. Use the piston tongs to pull out the dosing pis-
ton as far as the stop (caution with 2 mL
buret) and press the dosing unit upside down
onto a tabletop.
The piston rod of the dos-
ing drive is misaligned. Set the dosing drive on an empty housing of a
dosing unit and carry out 'Filling'.
The Dosino cannot
be removed from
the dosing unit. Dosing piston and/or stop-
cock are not in the
Exchange position. ￭ Carry out the [Filling] on the control
device.
￭ Check the cable connections to the control
instrument.
￭ Switch the control instrument off and on
again.
￭ Engage the dosing drive in place on the
dosing unit, i.e. rotate it to the left until it
stops.
If the dosing unit can still
not be removed after the
[Filling ]function has been
run, then the dosing piston
or the valve disc is blocked
or even damaged.
Caution, Chemicals! When disas-
sembling a dosing unit, be aware that chemi-
cals could still be contained in the cylinder.
1. Switch off the control device.
2. Press the locking button of the dosing unit
and remove the distributor. Turn it upside
down in its entirety.
3. Switch on the control device and trigger
'Filling'. If the rotation of the stopcock is
clearly audible, then the dosing unit, with
Dosino attached, can be reattached to the
distributor.