TriContinent C24000, Product Manual

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Dual pump continuous flow application
C-Series Product Manual
137
Dual pump continuous flow application
Introduction
This section describes how two C-Series pumps can be used to provide
continuous flow in a standalone application.
The [j] command is a unique feature of the C-Series pumps that allows a
change in state of auxiliary outputs based on the position of a syringe.
This enables one pump to trigger the other before it is finished dispens-
ing, causing the other in turn to begin dispensing. Consequently there is
no gap in the flow.
The fluid outputs of the pumps are combined, an auxiliary output of
each pump is wired to the input of the other, and program strings utiliz-
ing the [j] command are written to the pumps. To achieve standalone
operation, these strings are pre-written to the EEPROMs of the pumps.
Sequence of operation
The two pumps are named A and B, respectively.
1.
At power-up, Pump A and B are both initialized, and they both aspirate a
full syringe.
2.
Pump A starts dispensing, while Pump B remains idle.
3.
As Pump A nears the end of its stroke, Pump A triggers Pump B to start
dispensing.
4.
Pump B is now dispensing. When Pump A has finished dispensing its
syringe, it aspirates a full stroke.
5. When Pump B nears the end of its stroke, it triggers Pump A to start dis-
pensing.
6.
The sequence returns to step 3 and repeats continuously.