Operators Handbook DCU3 – System
6., Main function „Control Loops“
BAEDCU3 - Rev. 4.6 - 0504 6 - 24
6.15 Foam Controller
When foam comes into contact with the antifoam sensor, the foam measurement amplifier generates a
limit value signal for the antifoam controller. This signal is active as long as foam has contact with the
probe. The sensitivity of the foam detection can be adjusted via the display of the foam controller.
The output of the antifoam control function in the DCU system triggers a pump or a dosing valve to
supply antifoam agent to the culture. The pump or dosing valve is switched on and off periodically.
The dosing times and cycle time for intermittent operation can be entered into the control display.
6.15.1 Operating Display
Tag Entry Displayed value or function, required input
FOAM on / off Display of foam signal („on“ = foam)
SENSI low / high Input of sensitivity of foam signal amplifier
MODE Input of operating mode of controller
off
− controller off, OUT = off
auto
− controller on
manual
− manual access to controller output
OUT on / off Controller output („on“ = active); data entry only in „manual“ mode
CYCLE m:s Input of cycle time in [minutes:seconds]
PULSE m:s Input of running time of pump [minutes:seconds]
DI ALARM Enabling the display of digital input alarms
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