IFM Electronic efector300 SI0557, Руководство по эксплуатации, Страница: 4 / 15

4
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 outputs S1 and S2�
• Factory setting 1 x normally closed (S1); 1 x normally open (S2):
Flow
Output S1 (normally
closed)
Output S2 (normally
open)
< SP1 closed open
≥ SP1 open open
< SP2 open open
≥ SP2 open closed
► Reversion of the output function normally closed / normally open → 8.2.
•
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 (= in water), it increases with higher
flow speeds�
• The typical response time of the unit is 1���10 s� It can be influenced by the set-
ting of the switch point:
-Low switch point = quick reaction with rising flow�
-High switch point = quick reaction with falling flow�