4
• If the operating instructions or the technical data are not adhered to, personal
injury and/or damage to property may occur�
• The manufacturer assumes no liability or warranty for any consequences
caused by tampering with the product or incorrect use by the operator�
• Installation, electrical connection, set-up, operation and maintenance of the
product must be carried out by qualified personnel authorised by the machine
operator�
• Protect units and cables against damage�
3 Functions and features
3.1 Application area
The unit monitors the flow in liquid and gaseous media�
3.2 Operating principle flow monitoring
• The unit detects the flow speed to the calorimetric measuring principle and
switches the output:
- output closed if medium is flowing / output open if no medium is flowing�
This applies to the unit on delivery: output = normally open� If necessary, you
can change the output to normally closed operation (→ 8.2). Afterwards the
following applies: output open if medium is flowing�
• 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 when 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�
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