Dynasonics Fusion Water Flow Meter - Manual (Page 18)

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4. FUSION POWER-UP
FUSION Firmware Version
After power is applied to the FUSION flow meter, the display will
illuminate and show the software version that is running inside of
the flow meter as Ux.xx. Have the firmware version available
when contacting factory technical support personnel so that more
effective service can be provided.
Initialization
After power-up or after exiting Keypad Configuration, the flow
meter will conduct self-diagnostic, measurement and buffering
operations. During this time, the flow meter display will show
AUTO ADJ and will count down from 10.
Total Flow Backup
The accumulated flow, indicated on the bottom line of the LCD, is
backed up into FLASH memory once every 10 minutes. On power
-up, the last value written to memory is restored on the LCD and
new accumulations are added as they are recorded.
5. FUSION OPERATION
Normal Operation
If the flow meter is filled with liquid, the flow meter will display
either DOPPLER or TRANSIT on the upper right side of the LCD—
indicating the mode of operation that is supplying the flow
readings to the display and outputs. When operated in AUTO
mode, the FUSION continuously dwells between transit time and
Doppler flow measurement circuits and determines the better
measurement based on the present liquid conditions.
Positive and Negative Flow
FUSION, when operated in AUTO mode, will measure positive and
negative flow rate—so long as the liquid is relatively clean and
the unit is operating in Transit mode. Negative flow will not
influence the 4-20mA or pulse outputs, but will show on the LCD
as a negative flow rate. (Faulty check valves are the primary
reason for negative flow indication.) FUSION will also indicate
negative flow if the flow direction through the meter does not
match the FLO DIR selection parameter that has been entered—
see page 22 for details.