IFM efector300 SI0102 Operating Instructions Manual page 33

Hysteresis function
flow
maximum flow
switch point (SPx)
minimum flow
OUT
OUT
When the flow rises, the outputs switch when the corresponding
switch point (SPx) has been reached.
When the flow falls again, the output switches back when the value
"SPx minus hysteresis" has been reached..
The hysteresis is considerably influenced by the choice of the operat-
ing range on the sensitivity curve of the sensor:
• In the case of adjustment to HI-Flow values in the range 0 ... 60cm/s
the hysteresis is 2 - 4 cm/s (values apply to water).
• In the case of adjustment to HI-Flow values above 100 cm/s the
hysteresis increases as the flow rises.
The typical response time of the unit is 3 ... 8 s. It can be influenced
by setting the LO-Teach and the switch point:
• The lower the LO-Teach or the switch point is set, the faster the unit
switches on.
• The higher the LO-Teach or switch point is set, the faster the unit
switches off.
1
0
1
0
hysteresis
t
33