Metrohm 806 - Page 36

6.1 Problems
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806 Exchange Unit
Problem Cause Remedy
￭ If necessary contact the Metrohm Service
Dept.
No dosing takes
place at all
Tubing connections are
blocked or dosing unit is
not assembled correctly.
￭ Check whether the dosing tip is blocked.
￭ Check whether the dosing tubing is con-
nected to the correct port.
￭ Check whether the dosing port is sealed off
with a stopper.
￭ Check whether the VENT port is sealed off
with a stopper (vacuum in the supply bot-
tle!). The VENT port must be open for pres-
sure compensation.
￭ Remove the dosing drive and check
whether the dosing piston is connected to
the dosing drive. The piston stopper must
be flush with the upper side of the hous-
ing.
￭ Check whether the connection cable is
attached to the dosing drive.
It is not possible to
attach the exchange
unit.
The flat stopcock of the
exchange unit is not in the
exchange position.
Switch the flat stopcock manually to the
exchange position (lever switch directed to the
right).
The piston rod in the
exchange unit is not in the
right position.
Switch the piston rod to the right position.
The exchange unit
can not be removed
and the "Status"
LED is flashing
slowly.
It is being dosed or filled
and/or the Titrando is not
in the exchange position.
Stop the run or carry out a "filling".
Die "Status" LED
does not light up,
even though an
exchange unit is
attached.
The exchange unit has not
correctly been attached.
Remove the exchange unit and attach it again
until it snaps in. The LED flashes during data is
read from an intelligent exchange unit and
lights up constantly if the exchange unit has
correctly been recognized.
The "Status" LED
flashes rapidly.
The dosing drive is overloa-
ded because the stopcock
is blocked.
Switch off the Touch Control or exit PC Con-
trol. Check wether the exchange unit can be
removed. If it cannot be removed, check
wether the flat stopcock still can be turned.
Switch it manually to the exchange position
turning it to the right. Remove the exchange