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6 pump control, Pump control – Metrohm 862 Compact Titrosampler User Manual

Page 43

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4 Titration and automation sequences

862 Compact Titrosampler

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33

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

Moving to special beaker position

Lower the lift to work position

Switch on the rinsing pump and the aspiration pump

Wait for Rinsing time to be completed, the aspiration pump remains
switched on

Switch off the rinsing pump and wait for Aspiration time to be com-
pleted

Switch off the aspiration pump 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

Switch on the rinsing pump and wait for Rinsing time to be comple-
ted.

Switch off the rinsing pump

4.4.6

Pump control

Rinsing the electrode and aspirating the sample vessels is carried out with
the aid of an 843 Pump Station with two membrane or peristaltic pumps.
These are connected to the 862 Compact Titrosampler by means of a
remote cable (see Chapter 3.10.2, page 24). The pumps can be operated
manually by push-button or controlled by means of remote lines.

The method runs of the 862 Compact Titrosampler automatically switch
the pumps on or off at a given time. The sequences cannot be modified.

You can define the duration of the rinsing and aspiration procedures
under Menu

Parameters Automation, see page 133ff.

Note

The pumps of the 843 Pump Station cannot be stopped manually
on the 862 Compact Titrosampler. In the event of an Emergency
stop
, switch off the 843 Pump Station with the red mains switch.