Accusonic 8510+ series Reference Manual page 59

7-4 Accusonic Model 8510+ Series Flowmeter
VOLUME INIT VALUE
LEARN PATH RATIOS
TEMP CORRECTION
MANNING n
MANNING slope
MANNING MAX LVL
OVERRIDE LEVEL?
MANUAL LEVEL
SURCHARGE LEVEL
LOW LEVL CUTOFF
MIN SUBMERSION
BOTTOM FRICT'N
Any flow which is declared to be zero will be output on the displays and analog
outputs as zero, and treated as zero flow for the computation of Volume and
the computation of Sum of Section Flows.
The current value of the Totalized Flow or Volume.
The volume may be reset to any value as required, Range 0 to 999 999.
For unused sections, this parameter should be set to zero, otherwise it will
contribute to the Sum of Volumes.
"Pipe" mode only.
If set to 1, the "Learning" routine will be invoked, and a new path ratio table
will be created automatically. (See Chapter 3, Pipe Mode).
The parameter will reset to 0, and the table frozen after 1000 readings.
Warning: all paths must be good and flow non zero if this routine is invoked.
A constant in F or C which is added to the computed temperature to correct
for minor variations in the water quality.
Range -30 to +30. Normally set to 0.
C The Manning coefficient of roughness.
Usually between 0.01 & 0.03.
C The slope of the energy line in the conduit: a dimensionless number:
Usually between 0.0 to 0.010.
C The maximum value of Level for which the Manning Formula is valid.
Range: -5000 to +5000.
C Selects whether the level is to be derived from the 4-20 mA analog level input
or from a manually entered fixed value.
To select the analog input, set to 0.
To select the manually entered Level value. set LEVEL MANUAL to 1.
C A fixed Level value, representing the elevation of the water surface
above the site datum.
Range: -5000 to +5000
C The value of Level at and above which the section is surcharged.
For an open channel site, this must be set above the highest possible Level.
For a closed conduit, it is set equal to the elevation of the top of the conduit or
soffit.
Range: -5000 to +5000
C Elevation of the water surface, above the site datum, below which the
flowmeter will regard the flow as zero.
Range -5000 to +5000
C
The minimum submersion is the minimum distance which the water surface
must be above a path for the path to be energized and used by the system to
compute flow. Range: 0.0 to 5.0.
Usually set to a value at least equal to the surface wave amplitude, or if the
surface is smooth, set in accordance with the following:
for 1 MHz transducers,
for 500 kHz transducers, 0.07Path Length in ft, or 0.04Path Length in m.
for 200 kHz transducers, 0.11Path Length in ft, or 0.06Path Length in m.
C The ratio between the assumed velocity at the conduit bottom and that at the
elevation of the first good path above the bottom. Also used to compute the
assumed velocity at the top of the conduit under surcharged conditions.
Range: 0.0 to 2.0 Usually set to: 0.8 for multi-path open channels.
A lower value, (0.5 min.), if the bottom path is very near the bed.
A value of 1.2 to 1.8 may be appropriate for single path installations. See p 3-4
0.05Path Length in ft, or 0.03Path Length in m.