Accusonic 8510+ series Reference Manual page 9

1-2 Accusonic Model 8510+ Series Flowmeter
When the Level is too low for any acoustic paths to operate (or if they are submerged and have failed), flow
may be computed using the Manning equation. When the level is higher and ultrasonic paths are operating,
a "Trapezoidal" integration method is used. When the conduit is surcharged, either the same integration
algorithm may be used (modified to allow for the friction effect of the top of the conduit), or alternatively
the "Pipe" mode may be used.
The flowmeter may be configured to provide determinations of flow in up to five (5) separate and
dissimilar conduits or "Sections", each with one or two analog Level inputs and a number of acoustic paths.
The total number of Level inputs allocated among the Sections is limited to 4 (2-Path and 4-Path Versions)
or 8 (10-Path Version), and the total number of paths allocated among the Sections is limited to 2, 4, or 10
depending on the version purchased.
The electronic unit provides up to four (4) or eight (8) independent outputs in a 4-20 mA analog form,
which may be differently scaled to output separately forward and reverse flow, flow over any range from
reverse to forward, mean velocity, level, water temperature or sum of section flows.
Optional six (6) alarm relays may be fitted to the electronic unit to provide flow and level threshold alarms
for each section or sum of sections, section status (fail) alarms, or totalizer pulses.
An LCD touch screen display of flow and diagnostic data is provided with every flowmeter. The site
parameters may be entered into the flowmeter's non-volatile memory from this touch screen display, by
way of a user-friendly menu. Alternatively, a user supplied PC with a communications software provided
with every flowmeter may be used in place of the touch screen display.
An RS232 port is provided for use with a user supplied PC which has Accuflow software installed. This
provides a "Windows" based user friendly flowmeter configuration routine, as well as graphics showing
trends from recent flow data, the received acoustic signal waveforms and other data to aid commissioning.
An integral data logger is standard, which stores all of the measured variables at a chosen interval, using
non-volatile Micro SDHC Class 4 memory card. The data log interval and turning the data logging
function on or off can be accessed from the "Logging" menu. An 8GB SDHC memory card will store over
20 years of data logging at a 1 minute interval.