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 2 Preparation and Installation<br />
In the case of the <strong>AV</strong><strong>2150EX</strong>, the sensor is labeled and X-marked<br />
for special usage conditions in order to prevent static electricity.<br />
Avoid conditions that may generate a static charge, such as<br />
rubbing the <strong>AV</strong><strong>2150EX</strong> with static producing cloth.<br />
X-Marking<br />
WARNING<br />
ELECTROSTATIC HAZARD<br />
DO NOT RUB<br />
CLEAN WITH DAMP CLOTH ONLY<br />
Figure 2-23 <strong>AV</strong><strong>2150EX</strong> Sensor Cable Labels<br />
2.7.1 Positioning the <strong>AV</strong><br />
Sensor<br />
Ideal Conditions - Uniform <strong>Flow</strong><br />
Sensor installation is discussed in Section 2.8 of this manual.<br />
Consult your <strong>Isco</strong> Mounting Rings instruction manual for<br />
detailed hardware information. This section explains how to<br />
position the <strong>AV</strong> Sensor in flow streams.<br />
Several factors concerning the <strong>AV</strong> Sensor’s installation may<br />
affect your system’s performance. Review the following to understand<br />
how to obtain the best results:<br />
Uniform flow - The <strong>AV</strong> Sensor provides the best results in flow<br />
streams with uniform flow. An example of uniform flow is shown<br />
in the margin.<br />
Avoid poor channel conditions - Poor channel conditions may<br />
cause incorrect or erratic readings. Areas to avoid are:<br />
• outfalls or channel intersections<br />
• flow streams at very low levels with high flow rates<br />
• turbulence<br />
• channel sections that are apt to collect debris or silt<br />
• depths that consistently run below 2.54 cm (1 inch).<br />
Install the <strong>AV</strong> Sensor in streams where the liquid covers the<br />
sensor. The <strong>AV</strong> Sensor can detect levels above approximately<br />
1.0 cm (0.4 inch) and typically can measure velocities in streams<br />
as low as 2.54 cm (1 inch). Streams that run consistently below<br />
2.54 cm are not a good application for the <strong>2150EX</strong>.<br />
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