JDC Electronic SA EasyFlow - Manual (Page 11)

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End of data acquisition
During the whole measuring procedure, the EasyFlow keeps trying to detect the
end of the salt cloud. The operator will follow the evolution as well. When the water
salinity comes back to its initial value, the display will normally say End of cloud.
The operator will ensure that the salinity has dropped to its initial value. If so he
can stop the procedure by pressing ENTER. The EasyFlow does not switch off automatically unless the memory
is exhausted. At this moment or when pressing touch ENTER, the measurements are saved in memory and then
begin the flow rate computing. For this last one all measurements until the pressure on the button ENTER will
be used.
Display of the results
The procedure having run normally, the module having detected the beginning and
the end of the salt cloud, it will now display the result as shown here at the right. If
at the moment of the display shows End of cloud the measurement of salinity has
reached its initial value, we may take it for granted that all the injected salt has
passed though the gauging area.
It may happen that the EasyFlow does not detect the end of the cloud despite favourable conditions and that
the operator interrupts the procedure. The estimated value should in fact be quite correct since the beginning
of the cloud had been detected correctly by the module and the end by the operator.
To verify that the gauging was well done and to eventually correct the flow calculation it is recommended to
transfer the data to the PC. (See next chapter)
End of acquisition due to errors
If the EasyFlow has not been in a position to acquire a sufficient amount of measurements or if an anomaly has
been produced during the gauging, one of the following errors could appear.
Causes: Insufficient amount of measurements (<30) before the arrival of the
salt cloud.
Solution: Wait longer before injecting the salt into the water course.
Causes: Abrupt salinity variation (external adding of dirty water, probe out of
water …), too early manual stop.
Solution: Start again in a more stable site.
Causes: Manual stop before the end the salt cloud, change of the basic
salinity, exhausted memory …
Solution: Verify the gauging curve on the PC, increase the measurements
interval.