8
4.3 Consumed quantity monitoring (ImP)
The unit has an internal mass flow 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)
4.3.1 Display and counting method of the quantity meter
Meter reading:
• The current quantity meter reading can be indicated
• In addition, the value before the last reset is saved� This value can also be
displayed
�
The meter saves the totalled volumetric flow quantity every 10 minutes�
After a power failure this value is available as the current meter reading� If a
time-controlled reset is set, the elapsed time of the set reset interval is also
saved� So the possible data loss can be at most 10 minutes�
Counter reset:
• There are different ways to reset the quantity meter�
→ 10.3.5 Time-controlled counter-reset
→ 10.3.7 Counter reset using an external signal
• If the quantity meter is not reset by applying one of the above-mentioned
methods, an automatic reset takes place when the maximum volumetric flow
quantity that can be displayed is exceeded (overflow)�
Consideration of the direction of flow:
• The quantity meter takes account of the flow direction when totalising the
consumed quantity� The following counting methods can be defined via the
parameter [FPro]
[FPro]
Counting method
0+
Negative flow values (against the marked direction of flow) are not taken
into consideration for totalling�
– +
Negative flow values are subtracted from the consumed quantity�
