Metrohm 838 Advanced Sample Processor Manual - Manual (Page 69)

2.8 Dosing and liquid handling
Metrohm 838 Advanced Sample Processor, Operation 61
2.8.5 Liquid handling functions in detail
Dosing
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Example:
DOS: 1.1 : 1.000 mL Default port = 1
'Normal' dosing can be carried out by entering a volume. Automatic
cylinder filling is triggered neither before nor after the dosing process.
If the dosing piston reaches 'max. Volume' mark (10'000 impulses) dur-
ing the dosing process then the cylinder will be refilled.
Dosing a negative volume
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Example:
DOS: 1.2 : -1.000 mL Default port = 1
If a negative value is set for a volume then the dosing process will take
part in the opposite direction, i.e. a liquid will be aspirated through the
given port. Automatic cylinder filling is triggered neither before nor after
the dosing process.
If the dosing piston reaches the zero mark during the dosing process
then the cylinder will be refilled.
Do not select any volume that is larger than the nominal cylinder vol-
ume. Aspiration should take place with a single piston stroke.
This function can be used for pipetting.
Filling
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Example:
DOS: 1.3 : fill mL Default port = 2
Filling the cylinder can be carried out from a freely selectable port. After
the filling process the stopcock remains at the selected port.