Control Electronics - Burkert 8718 Manuel D'utilisation

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Type 8718, 8719 / 8708, 8709
System Description
Fig. 2:
Flow-rate measurement; Differential pressure method
properties of the differential pressure method
This measuring method has very short response times and therefore also allows very short sampling rates by
the control electronics.
The measurement occurs statically, no moving parts are required in the fluid.
5.2.4.
control electronics
Microprocessor electronics process the current set-point and actual flow-rates and control the actuating element.
The sensor signal is processed by the control electronics and is converted by the calibration curve stored in the
device into a value corresponding to the actual flow-rate.
To control critical processes, where quick flow-rate changes are not permitted, a ramp function can be activated
via the "Mass Flow Communicator" software (see Chapter 10.1.3. Mass Flow Communicator (PC software)).
In doing so, the parameters for an ascending and a descending set-point value can be set separately.
More detailed information on the ramp function and on all other functions can be found in the software
documentation for the LFC / LFM.
control deviation:
Control deviation
=
x
=
d
The control deviation is processed according to a PI control algorithm.
The control parameters are set at the factory.
To take account of the properties of the control path, the controller operates with path-dependent amplification
factors. When the autotune function runs, these are determined automatically.
p
1
Set-point value
Actual value
w
x
p
2
english
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871987088709

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