Flowlink 5.1 Software Instruction Manual - Isco
Flowlink 5.1 Software Instruction Manual - Isco
Flowlink 5.1 Software Instruction Manual - Isco
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<strong>Isco</strong> <strong>Flowlink</strong> <strong>5.1</strong> ® <strong>Software</strong><br />
Graph Window<br />
best fit curve data point is offset by this offset value to<br />
calculate the upper and lower limits.<br />
Manning<br />
Coefficients<br />
Flow Profiles (Pulse<br />
Doppler only)<br />
Saving Graphs and<br />
Tables<br />
When adding a best fit curve using a Manning formula, <strong>Flowlink</strong><br />
opens a dialog box so you can add the Manning coefficients.<br />
Enter values for the following:<br />
• Diameter - Enter the pipe diameter.<br />
• Slope - Enter the slope as a dimensionless quantity,<br />
delta Y/ delta X, not as percent slope.<br />
• Roughness - Enter the roughness coefficient for the pipe<br />
(see page 86).<br />
When graphing flow data from Pulse Doppler instruments, there<br />
are five additional options for viewing the data. From either the<br />
toolbar or Graphs>Flow Profile, you may select any combination<br />
of the following views:<br />
The Profile Cross-Section window shows a hydrograph and a<br />
color contour plot of the flow profile. This flow profile is<br />
developed from the raw beam velocity profiling information. This<br />
raw velocity data is entered into an algorithm that produces a<br />
mathematical description of velocity as a function of position<br />
within the pipe or channel. The Y axis represents channel height,<br />
and the X axis represents channel width. Velocity is represented<br />
by different colors.<br />
Velocity and Velocity Vector plots indicate the quality of the<br />
sensor installation and alignment. In a perfect installation,<br />
Beams 1 & 3 will be equal in amplitude and opposite in sign.<br />
Beams 2 & 4 will also be equal in amplitude and opposite in sign,<br />
but will have a greater amplitude than 1 & 3 by approximately<br />
50%. Even in a perfect installation, however, hydraulic<br />
conditions may still produce asymmetrical beam profiles.<br />
A Pulse Doppler instrument operates by emitting a sound pulse<br />
and then receiving the echoes backscattered by material<br />
suspended in the flow. Amplitude is a measure of the strength of<br />
this return signal.<br />
Correlation is a measure of the quality of the processed velocity<br />
information. Lower Correlation values (e.g., below 100) are an<br />
indication of poor quality velocity data. Higher Correlation<br />
values (e.g., above 150) may indicate external interference (noise)<br />
or the presence of a “hard” acoustic barrier.<br />
The Play/Pause Graph button on the toolbar shows the data<br />
sequence in a continuous loop until Play/Pause Graph is pressed<br />
again.<br />
Once you have created a graph or a table, you can save it for later<br />
use, or to be used as an object in another application. <strong>Flowlink</strong><br />
supports Object Linking and Embedding (OLE 2.1).<br />
To save a graph or table:<br />
128