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. In case of need you can change the output to normally closed (-> 7.2). It then 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 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.