Process Noise Damping - Siemens SITRANS FC430 Operating Instructions Manual

Functions

8.5 Process noise damping

Empty tube monitoring parameters
Two parameters for setting the empty tube monitoring function are available:
● Empty Tube Detection (Modbus address 2129)
● Empty Tube Limit (Modbus address 2127)
The empty tube monitoring is activated via the Empty Tube Detection parameter. When the
empty tube monitoring function is on, the massflow / volumeflow value is forced to zero if the
tube is empty.
The tube is defined as empty, if the measured density value is lower than the value defined
via the Empty Tube Limit parameter.
Note
Process media density
Risk of unintentionally forcing flow values to zero, if the difference between the empty tube
limit density value and the density of the process media is not sufficient.
• Ensure sufficient difference between the empty tube limit density value and the process
media density
8.5 Process noise damping
Noise damping function
The dynamic sensitivity of the flow measurement signal to rapid changes in process flows
can be reduced by use of the process noise damping function. The function is typically used
in environment with:
● Strongly pulsating flow
● Changing pump speeds
● Large pressure variations
Process noise damping settings
Reduce interfering process noise by increasing the setting of the parameter "Process Noise
Damping".
● Centrifugal pump (1: low)
● Triplex pump (2)
● Duplex pump (3)
● Simplex pump (4)
● Cam pump (5: high)
The default value is "Duplex pump". The damping affects all functions and outputs of the
sensor.
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Operating Instructions, 05/2015, A5E03361511-AF
FC430 with HART