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Sonar system for monitoring a sludge blanket. Answered

I am wanting to build a sonar system that is able to tell me what level the sludge blanket is at in a tank.

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NachoMahma (author)2010-12-21

.  Ultrasonic level/distance transmitters work well in an open-top tank. Can work well in a closed tank, but may take some tweaking. Google should find you some schematics.
.  Remember that most U/S level xmitters have a minimum distance of about ten feet from transducer.

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steveastrouk (author)NachoMahma2010-12-22

10 feet ? Really ? How come ?

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NachoMahma (author)steveastrouk2010-12-22

.  Gives the transducer time to stop vibrating before trying to receive an echo. SpeedOfSound x ringingTime = minimumMeasurableDistance. IIRC, it's often called "blanking."

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framistan (author)2010-12-21

Dont know if this will help you... but there are some pumps that use a kind of computer controlled monitoring of water/sludge levels. The brand is "blue-Angel" pumps. They are made in USA, and maybe you could buy it rather than try to invent it. Try going to blueangelpumps.com they have a technical questions section. Go to allstarsewerequipment.com to buy one. some of the ones made by blue angel have advanced monitoring switches... some have standard float switches.

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