BioPAT
®
Trace | Multi Trace Operating Instructions 19
BioPAT
®
Trace | Multi Trace Product Description
When this segment is released by re-switching the valve, the flow goes to the
conductivity cell, where it generates a signal. The intensity of the signal is a
measure of the concentration of the sample. One big advantage of this
enrichment method is the very broad measuring range that is achieved by
varying the diffusion time; it also protects the sensor against inferring
particles in the sample.
Bypass
Valve
Holding
chamber
Measuring cell
Donor
Bypass
Holding
chamber
Measuring cell
Valve
Donor
Valve control during the determination
of the baseline and while loading.
Valve control while unloading and
during signal detection.
Fig. 5: Valve control
PID Control
Feeding in a cultivation can be reliably controlled with the integrated PID
controller. The PID controller consists of three interacting single controller.
These are the proportional controller (P), the integral controller (I), and the
derivative controller (D). The control action of the controller is described by
adifferential equation:
The persistent control deviation of the proportional gain of the controller
canbe balanced with the integral gain. With the derivative gain of the
controller it is possible to react to fast changes of concentrations inside the
reactor. The PID controller is better suited for feeding processes than a simple
two-level controller.
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