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 5 Maintenance<br />
The cable and outer surfaces of the <strong>AV</strong> Sensor may also be<br />
cleaned with mild detergent and warm water.<br />
If the flow stream carries a great deal of debris, beware of organic<br />
materials that may collect beneath the <strong>AV</strong> Sensor. This material<br />
swells as it becomes saturated with water and may exert<br />
pressure on the outer diaphragm. This can damage the transducer<br />
and permanently disable the <strong>AV</strong> Sensor. Keeping the ports<br />
clean not only prevents damage, but assures you that the <strong>AV</strong><br />
Sensor will respond to the hydrostatic pressure above instead of<br />
the pressure created by swollen material.<br />
Gently flush<br />
diaphragm cover<br />
with water.<br />
No tools!<br />
Ports<br />
If the ports become blocked:<br />
1. Remove the sensor from its mounting ring, plate, or carrier.<br />
2. Scrape any accumulated solids off the exterior of the sensor.<br />
Use a brush and flowing water.<br />
3. Remove debris that has accumulated in the ports.<br />
4. The outer diaphragm is behind the small round cover on<br />
the bottom of the sensor. It should be visible through the<br />
two small openings at the center of the cover. Gently flush<br />
the cover and holes with water to remove debris.<br />
CAUTION<br />
Avoid using tools near the cover openings. The transducer is<br />
extremely sensitive to pressure applied to its exposed surface.<br />
Direct or indirect contact with the outer diaphragm may permanently<br />
damage the <strong>AV</strong> Sensor.<br />
5.6.3 Sensor Cable<br />
Inspection<br />
Erroneous level or velocity readings may not always indicate a<br />
fault inside the <strong>AV</strong> Sensor body. A damaged cable can affect the<br />
operation of the sensor, particularly if the reference air tube<br />
inside the cable is collapsed or blocked. Damaged cables cannot<br />
be spliced or repaired.<br />
If the <strong>AV</strong> Sensor cable is damaged, you must replace the entire<br />
assembly, as the sensor body and cable are a factory-sealed unit.<br />
Keep the connector clean and dry and install the cable so that it<br />
is not at risk of damage resulting from other activity taking place<br />
in the area. The connector can be replaced in some instances,<br />
depending on the condition of the cable.<br />
In temporary installations, do not leave cables lying around<br />
where they may be stepped on or run over by heavy equipment.<br />
Do not leave extra cable loose in the flow stream where it can<br />
trap debris.<br />
In permanent installations, cables repeatedly subjected to abuse<br />
will fail and should be installed in conduit for protection. The<br />
conduit must be large enough to pass the connector through, as<br />
you cannot remove or replace it.<br />
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