ULTRAFLOW® 54/34
Kamstrup A/S · Technical description · 5512-2464_A1_GB_08.2019
59
8.3
Function of ULTRAFLOW®
During a flow measurement, ULTRAFLOW® passes through a number of sequences, which are repeated at fixed intervals.
Deviations only occur when the flow sensor is in test mode and when the supply is connected during initialization/start-
up.
The difference between the main routines in normal mode and fast/test mode is the frequency of the measurements on
which pulse emission is based.
In connection with Power Down, it may take up to 16 seconds to start with proper functioning.
In the flow sensor’s working range from min. cut off to satu
ration flow, there is a linear connection between the flow rate
and the number of pulses being emitted. The diagram below shows an example of the connection between flow and
pulse frequency for ULTRAFLOW® q
p
1.5 m³/h (
0
20
40
60
80
100
120
140
-0,5
0,5
1,5
2,5
3,5
4,5
P
u
ls
e
f
re
q
u
e
n
c
y
[
H
z
]
Flow [m³/h]
Pulse frequency and flow (q
p
1.5 m³/h)
Min. cutoff
Saturation flow (125 Hz)
Figure 48. Pulse frequency as a function of flow q
p
1.5 m³/h.
If the flow is lower than min. cut off or negative (backward flow), ULTRAFLOW® does not emit pulses.
At flows exceeding the flow corresponding to pulse emission at max pulse frequency, the max pulse frequency will be
maintained.
shows the saturation flow at a pulse frequency of 125 Hz for the different flow sizes and meter factors.