Metrohm 838 Advanced Sample Processor Manual - Manual (Page 17)

2.1 Operating principles
Metrohm 838 Advanced Sample Processor, Operation 9
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EXT
The key is used to switch on and off the pump connectors on
the rear side of the tower. On entry of the address of the connector (1
or 2) the current state of the connected pump is switched, i. e. a cur-
rently active pump is switched on.
The display indicates the current state of the pump conncectors (i. e.
PUMP–+ ; + means active, – means inactive).
Example:
PUMP on/off no. ? <2> display: PUMP -+--
PUMP on/off no. ? <2> display: PUMP ----
In this case pump 2 is switched on and off.
Under , >manual stop you can define whether the pump
connectors should be switched off with the key or not.
.
<
VALVE
+
The key is used to switch the position of the injection
valve at the tower of the Advanced Sample Processor.
Example:
VALVE: inject
switches the injection valve to the displayed position.
This function is only working in the Sample Processor models
2.838.0x20 with built-in injection valve.
>
*
RACK
-
With the key the sample rack can be initialized. The con-
nected peripheral devices (e.g. Dosimats, Dosinos) are not affected
by this.
The sample rack and lift (both lifts in 2-tower versions) are moved to
the zero position and automatic rack recognition is carried out. The
SAMPLE variable (= rack position of the current sample) is reset to
1.
Sequence control
START
The key starts a method. A start is only possible when the
Advanced Sample Processor is in the normal operating condition, i. e.
when the display shows ready .
If is activated after an interruption (, see below),
then the sequence continues with the next command.
The can also be used to carry out a single command line
in a run sequence (TRACE function), see p. Fehler! Textmarke nicht
definiert..