Operators Handbook DCU3 – System
6., Main function „Control Loops“
BAEDCU3 - Rev. 4.6 - 0504
6 - 19
6.13 pO
2
- Gasflow Ratio Controller
To improve the control quality, the pO
2
can also be controlled by means of continuously mixing of two
gases, e.g. O
2
and air, via an external massflow controller. The DCU3 - system realizes such a control
strategy by a cascade control with a pO
2
gasflow controller as the master controller and a gasflow ratio
controller as the servo controller. The pO
2
gasflow controller is a PID controller and controls the gas-
flow ratio controller, which is the servo controller.
The gasflow ratio controller acts as a ratio controller and can be used in two modes:
Control of the total gas flow (TOTAL): The setpoint for the total flow is manually adjusted.
The pO
2
gasflow controller provides a setpoint for the portion of Gas 1 (RATIO) in relation to
the total flow.
Connection of specific gasses to the massflow controller, depending on the oxygen con-
sumption of the culture and the available gasses. The following gasses can be connected:
– Air (GAS 1) and N2 (GAS 2) for low O
2
requirements
– O
2
(GAS 1) and air (GAS 2) for high O
2
requirements
– O
2
-(GAS 1) and N
2
(GAS 2) for processes with considerably varying O
2
requirements
6.13.1
Operating Display Master Controller (pO
2
-Gasflow Controller)
For a description of the tags, the physical units or entries, the displayed value or function
and of the required inputs see the table in section
6.3,
Controller Operation in General.
Summary of Contents for DCU 3
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