Siemens SITRANS FC410, Руководство по эксплуатации, Страница: 74 / 160

Functions
7.4 Empty tube monitoring
FC410 with Modbus
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Operating Instructions, 02/2016, A5E33120874-AC
SITRANS FC410 provides two parameters for setting the low flow cut-off:
● Low Mass Flow Cut-Off (Modbus address 2125)
● Low Volume Flow Cut-Off (Modbus address 2170)
7.4 Empty tube monitoring
The empty tube monitoring function uses the process density for detecting an empty tube.
Use of this function is recommended for all standard applications.
Note
Gas applications
Deactivate the empty tube monitoring function.
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