Bürkert 8012 Series, Operating Instructions Manual, Page: 37 / 136

37
Adjustmentandfunctions
Type 8012
Not inverted Contact
Low
threshold
High
threshold
ON
OFF
Inverted Contact
Low
threshold
High
threshold
ON
OFF
Fig. 21 : PNP pulse output, window operating, non inverted and
inverted
9.2.3. Detection of a change in the fluid
direction (only 8012 with optical
sensor)
On an 8012 with optical sensor, the pulse output can be configured
to indicate a change in the fluid circulation direction. Furthermore the
change of direction can be indicated immediately or after a configu-
rable time delay.
The behaviour of the output depends on the output wiring, NPN or
PNP, and on the operating, inverted or not.
F = Fluid direction same as direction of the arrow on the housing
T = Time delay before switching
Change
of direction
ON
OFF
T F
NPN pulse output, non inverted
Change
of direction
ON
OFF
T F
NPN pulse output, inverted
Fig. 22 : Detection of the change in fluid circulation direction; NPN
pulse output, not inverted and inverted
Change
of direction
ON
OFF
T F
PNP pulse output, non inverted
Change
of direction
ON
OFF
T F
PNP pulse output, inverted
Fig. 23 : Detection of the change in fluid circulation direction; PNP
pulse output, not inverted and inverted
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