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
Содержание DCU 3
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