Maximum flow limit
-
Max Flow Limit
This parameter dedicates, at which flow the max. value of the selected output signal is
created. (4-20 mA, 0-10 V, Fout). So it is possible to adapt the upper limit of the measur -
ing range to the individual requirement. If the
Max Flow Limit
is achieved, the selected
output delivers its maximal signal.
Advice:
If the
Max Flow Limit
is passed, display shows <Overflow> and the different output sig-
nals react as follows:
4-20mA → 24 mA is generated
0-10V
→ 12 V is generated
Freq.Out
→
Fout-Max
is shown
If flow is smaller than 0 respectively reversed output signals react as follows:
4-20mA → 4 mA is generated
0-10V
→ 0 V is generated
Freq.Out
→ 0 Hz is generated
Assignment of analog output signal
If the analogue output is used, the following assignment must be observed. 20 mA
corresponds to the
Max Flow Limit
4 mA corresponds to all values below the
Low Flow
Cut-Off
. The initial value of the measuring range can be calculated with the following
formula.
X = (D / Dmax + 0.25) / 0.0625
D = measuring range initial value
Dmax. = Full scale value
X = mA value at the start of the measuring range
For example: DU06 factory setting. Measuring range initial value 1 l/min,
full scale value 180 l/min
(1/180 + 0.25) / 0.0625 = 4.089 mA
This means that 180 l/min corresponds to 20 mA, 1 l/min to 4.089 mA and 0.99 l/min to
less than 4 mA.
0 on the remote display corresponds to 4 mA.
In this way a linear assignment of the analog signal to the flow value is achieved.
DU06 Instruction manual 09/2019
page 6
