Multichannel Systems PPS2 Manual - Manual (Page 16)

Peristaltic Pump Manual
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2.3.2 Operation of the Perfusion Peristaltic Pump via PPS2 Touch Screen
Alternatively it is possible to operate the peristaltic pump without software control, via touch
screen on top of the device. The touch screen provides the same control functions of the PPS2
which are available via software. The pumps can be operated independently from each other
or in a fixed ratio. The “Stop” button will always affect both pumps. The touch screen has
three windows, Configuration, Main and Speed.
Configuration Window of PPS2 Touch Screen
Please open the “Configuration” window first because settings done here influence
the settings in the “Main Window” and the “Speed Window”.
Select the check box “Fixed Speed Ratio”. Via up and down arrows you can choose the
relation between the velocity of the waste and the perfusion pump. If the “Fixed Speed
Ratio” function is active, both pump speeds will remain at the same relative relation.
For example 150 % to make sure that the waste pump runs faster than the perfusion pump.
Define a ratio below 100 % and the perfusion pump will run faster than the waste pump.
Note: If the waste perfusion pump is used for the suction of “waste” do not use a ratio below
100 %, this will result in flooding of the connected device!
Bubble Detector
The bubble detector connected to the waste pump tube detects insufficient flow in the waste
tube. This can be an indicator for a problem with the perfusion. A light barrier detects the
changes of fluid to air in the outlet tube and measures whether this event takes place at least
once every ten seconds or not. More than one bubble per 10 seconds is considered okay, less
is considered as an indicator that the fluid flow in the outlet is too low. The LED is constantly
on without tube, when the fluid flow is not correct it flashes fast, with correct flow the LED
flashes slowly. When the bubble detector detects too low fluid flow in the outlet tube, the
inlet perfusion pumps will be stopped automatically. The waste pump runs continuously to
prevent overflow.
Select “Use Bubble Detector” to switch the bubble detector on. This option influences the
“Main Window”. The indicator “Bubbles” is only visible in the main window when the check
box is selected here.
Main Window of PPS2 Touch Screen
In the “Main Window” you can start and stop the pumps separately. The “Fast” mode is,
for example for rinsing the tubes, the pump runs fast as long as the “Fast” button is pressed.
The color of the button above indicates whether a pump is running or not.