IFM SM4x00, Operating Instructions Manual

Page: 7 / 37

7
UK
4.2.2 Detection of the direction of flow (dir.F)
When dir�F is activated (→ 10.2.4) , the direction of flow is indicated by a switching
signal�
The output is switched on until the set minimum volumetric flow quantity in nega-
tive direction of flow (- LFC) is not reached (1)�
Afterwards the following applies:
-The output switches ON when + LFC is exceeded (2)�
-The output switches OFF when - LFC is not reached (3)�
+ LFC
+ Q
- Q
- LFC
1
0
1 2 3
+ Q : Flow in positive direction of flow
- Q : Flow in negative direction of flow
+ LFC: Minimum volumetric flow quantity in positive direction of flow
- LFC : Minimum volumetric flow quantity in negative direction of flow
Positive direction of flow = marked direction of flow,
with the factory setting marked by the arrow on the unit or after change via Fdir
marked by the attached label (→ 4.2.1) �
4.3 Consumed quantity monitoring (ImP)
The unit has an internal quantity meter (totaliser)� It continuously totals the
consumed quantity after the last reset� Pulse signals or a switching signal can be
used to monitor the consumed quantity�
→ 10.3.1 Quantity monitoring by pulse output (OUT1)
→ 10.3.2 Quantity monitoring by preset counter (OUT1)