6
•
Flow = “flow direction”: process value and display positive�
•
Flow against the “flow direction”: process value and display negative�
Only positive process values are processed for the signal output (limit values and
analogue values for volumetric flow)�
4.3 Consumed quantity monitoring (totalizer function)
The unit has an internal quantity meter which continuously totals the volumetric
flow� The sum corresponds to the current consumed quantity since the last reset�
•
The meter totals with the correct sign�
Flow according to the flow direction marked by the arrow: meter totals�
Flow against the marked flow direction: meter subtracts�
Counting pulses are only provided as the sum increases� After subtraction (consumded
quantity decreases) pulses are not provided again before the consumded quantity has
exceeded the former maximum value�
V = volumetric flow quantity, Imp = output pulses
•
The current meter count can be indicated�
•
In addition the value before the last reset is stored� This value can also be
indicated�
The meter saves the totalled consumed quantity every 10 minutes� After a power failure
this value is available as the current meter count� If a time-controlled reset is set, the
elapsed time of the set reset interval is also stored� So the possible data loss can be
maximum 10 minutes�
The meter can be reset as follows:
• Manual reset (→ 9.3.3).
• Time-controlled automatic reset (→ 9.3.3).
• External input signal on pin 2 (→ 9.3.5).
