Flowlink 5.1 Software Instruction Manual - Isco

Isco Flowlink 5.1 ® Software
Site Window - 4100/4200/6700
Diagnostics Box
Signal Strength
Spectrum Strength
Device Setup - 4100/
4200/6700
Some Isco instruments report self-diagnostics on their front
panel display and through Flowlink. Additionally, Isco
instruments can report error messages such as “PAPER OUT” or
“DISTRIBUTOR JAMMED.” These diagnostic and error
messages are displayed in the Diagnostics Box.
Diagnostics are useful when troubleshooting faulty readings
from an area velocity or ultrasonic flow measurement
instrument. The displayed values can help determine if the
sensor is installed and working correctly. Signal and spectrum
strength values are reported as a percentage. Zero percent
indicates that the sensor is either not connected, not operating,
or not receiving a signal.
Area velocity instruments will display the approximate strength
of sensor’s return signal. Percentages below 10 indicate a weak
signal. Percentages near 100 indicate a strong signal. Normal
percentages are from 10 to 90; typical readings in sewers range
from 50 to 90%. Ultrasonic instruments will display the
approximate strength of the ultrasonic return echo. Typical
readings range from 30 to 100%.
Reports the amount of noise in the area velocity return signal.
Percentages below 25 indicate a noisy return signal, percentages
near 100 indicate a clear signal. The typical range in most
installations is 40 to 100%. Ultrasonic instruments do not report
the spectrum strength.
• Percentages should never vary more than 25% from one
reading to the next. Wide variations indicate an unstable
installation.
• Low percentages should not cause concern if the level
and velocity readings are accurate and reliable. It is
possible that low percentages are normal for your
installation and the characteristics of the flow stream.
The diagnostics are most beneficial when monitored long-term. A
slow drop in percentages can indicate silt or debris building up
near the sensor, while a sudden large change can indicate a
failure at the site.
The Device Setup tab of the Site window allows you to view and
change instrument settings. The instrument settings on this tab
are not active until you connect to the instrument.
The availability of the following items will depend on the type of
instrument. Refer to the instrument’s instruction manual for
more information on its functions and features.
Adjustments Box - displays adjustments to flow measurement
instruments.
• Zero level offset is only applicable to area velocity
instruments. Enter the measured Zero level offset.
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