
IM-P309-02
MI Issue 2
43
15.1.6 Relative flow rate
The relative flow rate is the percentage ratio of the (current) volume flow and the entered
upper range value of the volume flow. You set this upper range value in the functional class
FLOW using the function "volume flow QV URV."
The calculation of the relative flow rate is based on the following formula:
relative flow rate = 100% x (Qabs – lower range limit) / (upper range limit – lower range limit)
If you select the function "relative flow," the following will be displayed (example):
Relative flow
95.3%
15.1.7 QV + Forward flow counter
If the function "QV+ forward flow counter 1" is selected, in the first line the actual flow will
be displayed:
XXX.X l
XXX.XX l/h
In the second line the LCD shows the current value of the forward flow counter 1. The displayed
unit is defined in the functional class FLOW using the function "volume flow unit". The unit
of the counter is defined in the functional class COUNTER using the function "counter unit".
15.1.8 QV + Forward flow counter 2
If the function "QV+ forward flow counter 2" is selected, in the first line the content of the
actual flow will be displayed:
XXX.X l
XXX.XX l/h
In the second line the LCD shows the current value of the forward flow counter 2. The displayed
unit is defined in the functional class FLOW using the function "volume flow unit". The unit
of the counter is defined in the functional class COUNTER using the function "counter unit".
15.1.9 QV + flow velocity
If the function "QV + flow velocity" is selected, the following will be displayed:
XXX.X l/h
XXX.X m/s
The first line shows the actual volume flow rate and the second line the mean flow velocity
of the medium. The displayed volume flow unit is defined in the functional class FLOW using
the function "volume flow unit", the unit of the medium’s velocity is always m/s.
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