TECHNICAL DESCRIPTION ULTRAFLOW
®
54 and 34
5512-385 GB/02.2014/Rev. H1
47
Figure 32
The excess water quantity in connection with start is the water volume that runs through the sensor during the
time
1b
t
before the first accumulation
1
V
within the test period. In the same way the lacking quantity in connection
with stop is the water volume passing through the sensor during the time
1e
t
from the last accumulation
n
V
until
stop
The volume accumulated during the test can be stated as:
21
1
2
21
21
...
ee
en
n
bb
b
tV
VV
tV
+
+++
+
∑
8.16 Calibration using serial data and externally controlled start/stop
The routine for calibrating ULTRAFLOW
®
using serial data is outlined below.
Figure 33
The sensor must be in test mode (see paragraph 8.14 Test mode).
Calibration is started by connecting the 4
th
pin of the internal plug (see Figure 33), simultaneously with starting the
test. E.g. this might take place at the same time as the master meter is started or at the same time as the diverter
to the weight is being changed. ULTRAFLOW
®
accumulates the water volume until you disconnect pin 4 and
terminate the test. Subsequently, the volume accumulated during the test can be read with respect to start and
stop. From the test has been completed until the accumulated quantity of water can be read, minimum 2 seconds
must pass (T
read
). No communication must take place with ULTRAFLOW
®
during testing.
Pulse emission stops when pin 4 is disconnected. The read water quantity and the number of emitted pulses may
differ as the pulse emission is controlled at intervals of 1 second.
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