Dynasonics Fusion Water Flow Meter - Manual (Page 27)

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Calibration of the 20 mA setting is conducted much the same way
as the 4 mA adjustments.
Procedure:
1. Disconnect the current loop output and connect the
milliammeter in series between the 4-20mA output and the
recording device.
2. Using the arrow keys, increase the numerical value to
increase the current in the loop to 20 mA. Decrease the value
to decrease the current in the loop to 20 mA. Typical values
range between 3700-3900 counts.
3. Re-connect the 4-20 mA output connections as required.
ADV DOP -- Advance Doppler Setup Mode
Advance setup mode allows access to the following parameters.
Select YES to access these parameters.
DOP SPAN - Doppler Span Factor
AGC MODE - Automatic Gain Control
**GAIN POT - Digital Gain Control
**FILTER - Hardware Filter Control
**DRIVE - Transducer Drive Signal Level
**Note: Only available with AGC MODE selected.
DOP SPAN—Doppler Scale Factor
This function can be used to make the FUSION Doppler flow
reading agree with a different or reference flow meter, or to
compensate for installation where there is inadequate straight
pipe to obtain a steady flow profile, by applying a correction
factor/multiplier to the readings and outputs. A factory calibrated
system should be set to 1.000. The range of settings for this
entry is 0.001 to 9.999. The following example describes using
the DOP SPAN entry.
 The FUSION meter is indicating a flow rate that is 4% higher
than another flow meter located in the same pipe line. To
make the FUSION indicate the same flow rate as the other
meter, enter a DOP SPAN of 0.960, to lower the readings by
4%.