Dynasonics MFX Series Insertion MagProbe Flow Meter - Manual (Page 67)

Rev. 01/11
-4.15- MFX
The Diagnostics screen provides valuable information regarding
the signal-to-noise ratio (flow meter data quality). The two lines
represent the voltage measurement across the electrodes with the
magnet biased with forward polarity and the other line with the
magnet biased with negative polarity. The separation between the
lines increases with flow velocity and as a line reaches the top or
bottom axis will roll over to the opposite axis.
In general, the more stable the signals appearing on the Diagnostics
screen are, the more stable the flow measurement readings will be.
Unstable signals, such as the signals shown in Figure 4.12, are
indicative of
x poor earth ground connections to the MagProbe,
x the probe electrodes not touching the conductive fluid in the pipe
(non-full pipe),
x electrodes that have become fouled with a non-conductive
substance or
x noisy power supply source.
PART 4 - SOFTWARE UTILITIES
Figure 4.12
Noisy Diagnostic Signal
Signal
Quality