9 internal dosing unit internal dosing unit – Metrohm 784 KFP Titrino User Manual
Page 111
4.2 Diagnosis
784 KFP Titrino
108
9 Internal dosing unit
Internal dosing unit
•
Remove exchange unit.
•
Check spindle zero position, see Fig. 5.
0.2 - 0.6 mm
Fig. 5
Fig. 6
The spindle must be 0.2 – 0.6 mm below the edge of the sliding plate.
The bar of the stopcock coupling must be exactly parallel to the lateral edges of the
KFP Titrino, see Fig.6.
•
Reinsert Exchange Unit.
Titrino fills.
The display of before reappears.
•
Knob
'dV/dt' to right stop.
•
Press the
time measure the time from start to end.
XXX X
********
cylinder empty !
mind selected language!
Spindle remains at maximum position. The transit time of the spindle is
20 s.
•
Measure spindle lifting (can be performed only if the 3.496.0070 Dummy Exchange Unit is
inserted or the locking switch (in right hole) is carefully operated with a screwdriver after re-
moval of the Exchange Unit).
From the start point, the spindle travels 80 mm. Instead of the spindle height, the ex-
pelled volume can be measured (corresponds to max. vol. of Exchange Unit used).
•
Press
again in the 'ready' position.
Times for filling:
per stop cock cycle 1 s
for filling
20 s (Tolerance: 10 %)
The following generally holds: Spindle and stopcock must move at a constant speed
(noise!). In the filling setting, the stopcock coupling must position the lever of the Ex-
change Unit correctly at the left stop (with virtually no play and without sticking).
•
Set potentiometer
'dV/dt' to left stop.
•
Press
(on instrument) at same time and use a stopwatch to measure the time for
1/10 of the cylinder volume to be expelled. The time should be ca. 90...110 s.
•
Set potentiometer 'dV/dt' to right stop.
•
Press