Hach AV9000S User Manual
Also see for AV9000: User manual
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A pressure transducer in the sensor converts the pressure of the water to a level measurement. Thelevel measurement and the user-entered channel geometry are used to calculate the wetted area ofthe flow stream.The sensor also contains two ultrasonic transducers: one is a transmitter and the other is a receiver.A 1 MHz signal is transmitted and reflected off of particles in the flow stream. The reflected signal isreceived and its frequency is offset by the Doppler shift proportional to the velocity of the particles inthe flow stream. The flow logger converts the doppler shift in the returned ultrasound signals to avelocity measurement.Product componentsFigure 2 shows the items in the shipment package. Contact the manufacturer if any components aredamaged or missing.Figure 2 Product components1 Submerged AV sensor 3 Junction box2 Submerged AV sensor with junction box 4 Mounting screws (6x)InstallationInstallation guidelinesD A N G E RExplosion Hazard. The non-IS AV sensors (770xx-xxx P/Ns) are not rated for use in classified HazardousLocations. For classified Hazardous Locations, use IS AV sensors (880xx-xxx PNs) installed per the controldrawings in 911/940 IS Blind Flow Meter manuals.D A N G E RPotential confined space hazards. Only qualified personnel should conduct the tasks described in this section ofthe manual.• Do not install more than one sensor in pipes with a diameter of less than 61 cm (24 inches).Multiple sensors in smaller pipes can create turbulent or accelerated flows near the sensors, whichmay cause inaccurate measurements.• Mount the sensor as close as possible to the bottom of the pipe invert. This will give the mostaccurate low-velocity-level measurements.• Do not monitor flows in the manhole invert. The best location for the sensor is 3 to 5 times thesewer diameter/height upstream of the invert.• Put monitoring sites as far from inflow junctions as possible to avoid interference caused bycombined flows.English 7 |
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