Flowlink 5.1 Software Instruction Manual - Isco

Isco Flowlink 5.1 ® Software
Graph Window
Since summary intervals re-sample the data to the interval you
specify, it can serve a number of purposes:
• Generating a table to report hourly average flow rate
summaries (Avg)
• Generating a table to report hourly or daily rainfall
totals (Sum)
• Smoothing the appearance of data in a graph (Avg)
• Generating a table to report the peak daily flow rate and
the time it occurred (Max)
• Generating a table to report the minimum recorded pH
value and the time it occurred (Min)
• Preparing data for additional operations, such as Series
Formulas or Volume Conversions (Avg)
Recalculating the data to summary intervals is a simple process.
For example, suppose a flow rate data set contains readings at
five-minute intervals. Applying an Average statistical function
over a one-hour summary interval would calculate the average
value from the twelve readings recorded each hour. This
recalculated data set could then be plotted on the graph, reported
in a table, or be used in additional operations.
You should keep in mind that this recalculated data must still
include a time stamp. Flowlink uses the “Display times at
Beginning or end of interval” to specify where the time stamp is
placed. Continuing with the above example, let’s look at a single
summary interval from 8:00 to 9:00 am. Flowlink averages the
readings starting with 8:05, 8:10, 8:15, through 9:00 am. With
Beginning selected, the time stamp is 8:00 am. With End
selected, the time stamp is 9:00. If your summary interval is one
day, “Beginning” is typically used.
For additional consideration, Isco instruments always place the
time stamp at the end. Isco instruments can take readings quite
often, depending on their configuration and current state. If the
instrument takes a reading every 5 seconds (to keep the LCD
readout current), but only records the readings in a memory
partition at 10-minute intervals, it records the average of 120
readings (12 per minute for 10 minutes) and time-stamps the
average with the current (end) time.
When the “Accumulate with reset” statistical function is selected,
summary intervals are used only to reset the count to zero to
begin the next interval. Summary Intervals are ignored when the
“Accumulate without reset” statistical function is selected.
Graph Properties -
Flow Conversion
Flow Conversion operations can perform off-line flow conversion
with level, or level and velocity data sets.
To calculate a flow rate off-line, the List of Series and Data Sets
should contain at least one series and one level data set for a
level-to-flow conversion. Area velocity flow conversions should
contain at least one series, and two data sets - level and velocity.
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