Metrohm 789 Robotic Sample Processor XL - Manual (Page 25)

1.7 The keypad
Metrohm Sample Processor, Introduction 17
9
LIFT Raises or lowers the lift of the active tower. The predefined lift posi-
tions (working position, rest position, rinsing position, shifting position,
special position) can be selected with the <SELECT> key. They can
be entered and saved separately for each rack in the configuration
menu.
As well as the predefined lift positions it is also possible to enter abso-
lute lift positions in mm via the numerical keys.
In the 2-tower models the tower can be selected with <SE-
LECT/TOWER>.
PUMP
4
The <PUMP> key is used for switching the pumps 1 or 2 of the ac-
tive tower on and off. By entering the pump number (1 or 2) the condi-
tion of the corresponding pump will be switched, i.e. if the pump is
switched off it will be switched on and vice versa. With Sample Proc-
essor models that have no pump or only one built-in membrane pump
the selected pump connection will be switched on or off.
The status of all pumps is shown in the display (e.g.
PUMP–+–+
; +
means switched on, - means switched off).
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 <PARAM>,
>manual stop you can define whether the pumps
should be switched off with the <STOP> key or not.
5
STIR The <STIR> key is used for controlling the stirrers. A stirrer can be
switched on permanently or switched on for a given period and then
switched off again. The <SELECT> key is used to select both the
stirrer and the function. The current status of the stirrer is shown di-
rectly in the display.
Example:
STIR: T1 : ON s Display: STIR +- (+=on -=off)
STIR: MSB2 : 10 s Display: STIR 10 s
In this case in the first line the stirrer at tower 1 is switched on. The stir-
rer is selected with the <SELECT> key. As can be seen in the sec-
ond line, the duration of the stirring process can also be entered.
The stirring rate can be set for each stirrer in the parameter menu or
with the <DEF> key.
Under <PARAM>, >manual stop you can define which stirrers can
be switched off with the <STOP> key.
DOS
6
The <DOS> key is used to control the connected dosing devices.
Both positive and negative volumes can be dosed. Negative volumes
are used for aspirating liquids, e.g. during pipetting.
As well as entering the volume to be dosed (with the numerical keys),