ULTRAFLOW®54(H)/(J)
KamstrupA/S∙TechnicalDescription∙5512‐1554_J1_GB_04.2018
41
8.3 Function of ULTRAFLOW
®
During flow measurement ULTRAFLOW
®
passes through a number of sequences, which are repeated at fixed
intervals. Deviations only occur when the meter 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.
Note: It may take up to 16 seconds to obtain correct function after a power-down.
In the meter’s working range from min. cut off to saturation flow there is a linear connection between the flow rate
and the number of pulses being emitted. The below figure shows an example of the connection between flow and
pulse frequency for ULTRAFLOW
®
q
p
1.5 m³/h (see Figure 36).
0
20
40
60
80
100
120
140
-0,5 0,5 1,5 2,5 3,5 4,5
Pulse frequency [Hz]
Flow [m³/h]
Pulse frequency and flow (q
p
1.5 m³/h)
Min. cutoff
Saturation flow (125 Hz)
Figure 36. 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
®
sends no pulses.
At flows exceeding the flow corresponding to pulse emission at max. pulse frequency, the max. pulse frequency
will be maintained.
Table 14 overleaf shows the saturation flows at pulse frequency of 125 Hz of the different flow sizes and meter
factors.
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