Metrohm 785 DMP Titrino - Manual (Page 150)

4.2. Diagnosis
785 DMP Titrino
147
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 af-
ter removal of the Exchange Unit).
From the start point, the spindle travels 80 mm. Instead of the spindle height, the expel-
led volume can be measured (corresponds to max. vol. of Exchange Unit used).
• Press <FILL> (on instrument) and simultaneously measure the time until the DMP 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 Ex-
change Unit correctly at the left stop (with virtually no play and without sticking).
• Set potentiometer 'dV/dt' to left stop.
• Press <DOS> (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. 76 ... 126 s.
• Set potentiometer 'dV/dt' to right stop.
• Press <FILL>.
11 Setting up original arrangement Setting up original arrangement Setting up original arrangement Setting up original arrangement
Reconnect all peripherals disconnected at the start of the diagnostic routine and perform a
short function test with these.