2150EX AV Flow Module - Isco
2150EX AV Flow Module - Isco
2150EX AV Flow Module - Isco
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<strong>2150EX</strong> Area Velocity <strong>Flow</strong> System<br />
Section 3 Programming<br />
3.3.3 No Velocity Data and<br />
<strong>Flow</strong> Rates<br />
Occasionally velocity readings are lost because either a flow<br />
stream does not contain enough reflective particles, or the sensor<br />
is covered with silt. These lost velocity readings are logged as a<br />
“No Data Code.” If the <strong>2150EX</strong> is set up to use area velocity flow<br />
conversion, it is then unable to calculate the flow rate. You can<br />
control how the <strong>Flow</strong> Rate readings will be reported during these<br />
conditions with the “Set flow rate to zero if no velocity data”<br />
checkbox, found on <strong>Flow</strong>link’s Velocity measurement tab.<br />
• Checked, the <strong>2150EX</strong> stores the flow rate as 0.0 when<br />
velocity data is not available.<br />
• Unchecked, the <strong>2150EX</strong> will use the last valid velocity<br />
measurement in the flow rate calculation.<br />
Note<br />
Measuring velocity becomes extremely difficult at low liquid<br />
levels. When the level falls below one inch, the module no longer<br />
measures the velocity. Instead, velocity is interpolated<br />
based on measurements that occurred between one and<br />
seven inches of liquid.<br />
Prevent Velocity Signal<br />
Interference<br />
If the <strong>AV</strong> Sensors of a multiple module site are placed near each<br />
other it is important that each sensor receives its own transmitted<br />
signal. To prevent this sort of interference, you can synchronize<br />
the modules so that only one module may take a velocity<br />
measurement at any given moment.<br />
To synchronize the velocity measurements of a multiple module<br />
site, check the Prevent interference box found on the Velocity measurement<br />
tab. You may leave this box unchecked for single<br />
module sites or multiple module sites measuring velocities of<br />
separate channels.<br />
Note<br />
The Prevent interference check box should always be selected<br />
when using the <strong>2150EX</strong> with LTC2191EX lithium battery<br />
packs, to prevent overloading the fused outputs.<br />
3.3.4 <strong>Flow</strong> Conversion The <strong>2150EX</strong> is capable of determining flow rates using either<br />
area velocity conversion or level-to-flow rate conversion. Table<br />
3-1 lists the available flow conversion methods.<br />
The <strong>2150EX</strong> is capable of calculating and storing any two conversion<br />
methods simultaneously. <strong>Flow</strong> conversions are defined on<br />
the <strong>Flow</strong> Rate and <strong>Flow</strong> Rate 2 measurement tabs in <strong>Flow</strong>link.<br />
To do this, select the Conversion Type that matches your application,<br />
then enter the required parameters in the fields to the<br />
right of the selected conversion type.<br />
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