IFM Electronic Efector 300 SI5002 - Functions and Features; 2�1 Application Area; 2�2 Operating Principle Flow Monitoring

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2 Functions and features
2.1 Application area
The unit monitors the flow of liquid and gaseous media�
2.2 Operating principle flow monitoring
• The unit detects the flow speed to the calorimetric measuring principle and
switches theoutputsS1andS2:
- OutputS1closedifflow≥SP1,outputS1openifflow<SP1.
- OutputS2closedifflow≥SP2,outputS2openifflow<SP2
Thisappliestotheunitondelivery:output=normallyopen.Incaseofneedyou
canchangetheoutputstonormallyclosed(→7.2).Itthenapplies:outputopen
ifflow≥SP1/SP2�
• If the flow speed increases, the switching status changes when the switch point
is reached�
• If the flow speed falls again, the switching status changes if the value "SP
minus hysteresis" is reached�
The hysteresis changes with the flow speed and it is essentially influenced by
the set monitoring range�
Itis2...5cm/sforthesetting5...100cm/s(=factorysetting),itincreaseswith
higher flow speeds�
• The typical response time of the unit is 1���10 s� It can be influenced by the
settingoftheswitchpoint:
- Lowswitchpoint=quickreactionwithrisingflow.
- Highswitchpoint=quickreactionwithfallingflow.