Metrohm 838 Advanced Sample Processor Manual - Manual (Page 46)

2.4 Commands
38 Metrohm 838 Advanced Sample Processor, Operation
2.4.2 Switching components
Pumps and stirrers can be switched as required, either together or
separately. They work independently and can be operated at the same
time as other functions are being carried out.
PERISTALT
PUMP
4
>sample sequence
4 PERISTALT: on s 3
on,off,1...999
-15…-1, 1…3…15
Pump control
1 st parameter: status or duration in s
2 nd parameter: pump rate and direction
With the PERISTALT command the peristaltic pump can be controlled.
The first parameter switches the peristaltic pump on or off. Alternatively
a particular pump duration (in seconds) can be set.
The second parameter sets the pump rate in 15 steps. The signed
value (+ or –) also defines the pump direction. If a negative signed
pump rate is set, the roller head of the pump drive revolves counter-
clockwise, otherwise it revolves in clockwise direction.
The LEARN mode is very useful for determining the optimal pump time
(see p. 71).
PUMP
0
EXT >sample sequence
4 PUMP 1.1 : 1 s
1.1,1.2 1…999 s,
1.∗,2.∗ on,off
Switching the pump connectors
1 st parameter: select pump connector
2 nd parameter: status or duration
With the PUMP command one or both pump connectors (16 V, DC) on
the rear side of the tower can be controlled separately. The first pa-
rameter selects the connector.
Syntax Of the 1
st parameter: tower.pump
1.* affects both pump connectors ( tower 2 not possible)
The connectors can be switched on or off individually or be activated for
a particular duration.
The LEARN mode is very useful for determining the optimal pump time
(see p. 71).