Metrohm 794 Basic Titrino - Manual (Page 150)

4.2. Diagnosis
794 Basic Titrino 146
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 removal of the Exchange Unit).
From the start point, the spindle travels 80 mm. Instead of the spindle height, the expelled
volume can be measured (corresponds to max. vol. of Exchange Unit used).
• Press (on instrument) and simultaneously measure the time until the Titrino
is 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 Exchange
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 .
11 Setting up original arrangement
Reconnect all peripherals disconnected at the start of the diagnostic routine and perform
a short function test with these.