
TECHNICAL DESCRIPTION
ULTRAFLOW
®
54 DN150-250
5512-876 GB/04-2012/Rev. F1
32
8.6
Function
In the meter’s working range from min. cut off to saturation flow there is linear connection between the flow rate
and the number of pulses being emitted. The below diagram shows an example of the connection between flow
and pulse frequency for ULTRAFLOW
®
q
p
150 m³/h.
If the flow is lower than min. cut off or negative, ULTRAFLOW
®
sends no pulses. At flows exceeding the flow
corresponding to pulse emission at max. pulse frequency of 128 Hz, the max. pulse frequency will be maintained.
(See
Diagram 9
).
Table 11
shows the flows of the different
flow sizes/pulse figures at max. pulse frequency of 128 Hz.
q
p
Pulse figure Flow @ 128 Hz
[m³/h]
[imp/l]
[m³/h]
150
1
461
250
0.6
768
400
0.4
1152
600
0.25
1843
1000
0.15
3072
Table 11
According to DS/EN 1434 the upper flow limit q
s
is the highest flow at which the flow sensor may operate for short
periods of time (
<
1h/day,
<
200 h/year), without exceeding max. permissible error. ULTRAFLOW
®
has no functional
limitations as to the duration of the period, during which the sensor operates above q
p
.
Please note, however, that high flow velocities may cause cavitation, especially at low static pressure.
0
20
40
60
80
100
120
140
-50
50
150
250
350
450
F
re
q
u
e
n
c
y
[
H
z
]
Flow [m³/h]
Flow-frequency (q
p
150 m³/h)
Min. Cutoff
Saturation flow (125 Hz)
Diagram 9
Содержание ULTRAFLOW 54 DN150-250
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