Dynasonics Fusion Water Flow Meter - Manual (Page 29)

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MEDIUM - (350Hz Cutoff)
HIGH - (250Hz Cutoff)
Select the hardware filter with a cutoff frequency that is above
the Doppler shift frequency to be measured.
DRIVE—Transducer Drive Signal Level
If the signal strength is higher than normal, or the meter is
reading noise at no flow, the drive level may be reduced to
obtain a more accurate reading.
0 = Lowest Drive Level
4 = Highest Drive Level
ADV TT -- Advance Transit Time Setup Mode
Advance setup mode allows access to the following parameters.
Select YES to access these parameters.
CAPTURE 0 - Capture Zero Flow Reference
TT SPAN - Transit Time Span Factor
CAPTURE 0—Capture 0 Flow Reference
Important: The zero flow calibration is conducted at the factory
and typically does not need field adjustment.
This function is used to capture the zero reference reading for the
transit time flow measurement. Make sure that the pipe is full
and that the flow is stopped, then select YES. The display will
flash CAPTURE during the process, then display GOOD if a valid
signal was measured. If a valid signal was not measured due to
an empty pipe or a faulty transducer, ERROR will be displayed.
Press the Enter key to continue.
1. Block a full pipe of liquid within the FUSION flow meter using
ball valves. If the unit indicates EMPTY PIPE, not enough
liquid was caught and the blocking procedure will need to be
completed again.
2. Ensure that the FUSION display is displaying TRANSIT. If the
display is indicating DOPPLER, wait a few moments to allow
gas to rise and the unit to automatically switch to TRANSIT.
3. Press and hold the MENU key for a minimum of 3 seconds to
access the Advanced Menu.