Accusonic 8510+ series Reference Manual page 61

7-6 Accusonic Model 8510+ Series Flowmeter
ELEVATION
C
SIG DELAY
MAX BAD
MEASURES
MAX VEL
CHANGE
MAX PATH
VELOCITY
XDUCER FREQ
For 2-path round pipe, Chebyshev integration, set both path weights to 0.500.
For 4-path round pipe, Chebyshev integration:

Paths 1 & 4 set to: 0.1382

Paths 2 & 3 set to: 0.3618
For 8-path round pipe, Chebyshev integration:

Outer Paths, set to: 0.0691

Inner Paths set to: 0.1809
For 4-path rectangular pipe, Gaussian integration:

Outer Paths, set to: 0.1739

Inner Paths set to: 0.3261
"Compound" mode only.
This parameter is ignored in "Pipe" mode.
The elevation of the center line of the path above the site datum.
In a given Section, the paths must be in the same numerical order as the elevations.
Crossed paths must have identical elevations. See Chapter 3, Flow Computation Algorithms
Overview.
The part of the signal travel time in s, which is due to the electronic circuits,
the total cable delay, and the signal travel time through the two transducer windows at
either end of the path.
Range: 0 to 20 s
For Model 7600, 7601, 7630, 7634, 7616, 7618, 7657, 7658, set to 6s
For Model 7612 transducer, set to 8s
For Model 7617 or 7656 transducers, set to 10s
For Model 7605 or 7625 transducers, set to 16s
These figures assume a cable run between the electronic unit and the section
of about 150 ft (50 m).
For longer cable runs, add 1s for every additional 300ft (100m) of distance between
electronic unit and transducers.
Additionally, the actual travel time of the waveforms can be verified with an oscilloscope
and the sig delay value can be adjusted accordingly.
The maximum number of consecutive measurement cycles in which no valid value of
velocity on a particular path is obtained.
If this value is not reached, the last good velocity value from that path is used for the Flow
computation.
If this value is reached, the path is declared to have failed, and its data are then not used for
Flow computation, unless and until new valid data are obtained.
Range: 1 to 500. Usually set to: 10.
The maximum change of water velocity between successive measurement cycles which is
considered to be reasonable. If this value is exceeded, the computed velocity will change
towards the new value at a rate limited by this parameter & the averaging filter. For
changes which are large compared with this parameter, the displayed velocity will change in
steps of about 0.3 * Max Vel Change.
The maximum water velocity which is regarded as physically realistic. Values in excess of
this value are regarded as erroneous.
The characteristic frequency (kHz) of the transducers.
For Model 7600, 7601, 7605, 7625, 7630, 7657, set to 1000kHz.
For Model 7616, 7617, 7618, 7634, 7656, 7658, set to 500kHz.
For Model 7612, set to 200kHz