Metrohm 862 Compact Titrosampler - Manual (Page 41)

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 4 Titration and automation sequences
862 Compact Titrosampler ￭￭￭￭￭￭￭￭ 31
￭ Wait for Dripping time to be completed
￭ Move to rack position 11
￭ Lower the lift to work position and switch on the stirrer
￭ Wait for Rinsing time to be completed
￭ Switch off the stirrer and move the lift upward
￭ Wait for Dripping time to be completed
After the last sample:
￭ Move to special beaker position
￭ Lower the lift in the rinsing beaker to work position
4.4.3 Double dipping
This automation sequence is suitable for simple determinations.
No pump is required for rinsing or for aspiration of the sample vessels. The
titration head with electrode and burette tips is immersed in the filled rins-
ing beaker on rack position 11 and on the special beaker position after
each determination. At the same time, the rinsing solution is stirred.
If required, auxiliary solution can be added prior to the beginning of a
determination with a Dosimat/Dosimat plus.
A filled rinsing beaker should be placed on rack position 11 and on the
special beaker position.
The individual steps:
￭ Move to the sample
￭ Lower the lift to work position
￭ Start the determination
￭ If necessary, initiate dosing (Activation pulse) and switch on the stir-
rer
￭ If necessary, wait for Start delay time
￭ Wait for end of determination
￭ Switch off the stirrer and move the lift upward
￭ Wait for Dripping time to be completed
￭ Move to rack position 11
￭ Lower the lift to work position and switch on the stirrer
￭ Wait for Rinsing time to be completed
￭ Switch off the stirrer and move the lift upward
￭ Wait for Dripping time to be completed
￭ Moving to special beaker position
￭ Lower the lift to work position and switch on the stirrer
￭ Wait for Rinsing time to be completed
￭ Switch off the stirrer and move the lift upward
￭ Wait for Dripping time to be completed
After the last sample:
￭ Lower the lift in the rinsing beaker to work position