Installation - Hach AV9000 Manual Del Usuario

Sensor kit components
Figure 2 shows the items in the shipment package. Contact the manufacturer if any components are
damaged or missing.
Figure 2 Submerged Area Velocity Sensor components
1 Sensor (oil-filled or non-oil filled)

Installation

Installation guidelines
Explosion Hazard. The non-IS AV sensors (770xx-xxx P/Ns) are not rated for use in classified Hazardous
Locations. For classified Hazardous Locations, use IS AV sensors (880xx-xxx PNs) installed per the control
drawings in 911/940 IS Blind Flow Meter manuals.
Potential confined space hazards. Only qualified personnel should conduct the tasks described in this section of
the 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, which
may cause inaccurate measurements.
• Mount the sensor as close as possible to the bottom of the pipe invert. This will give the most
accurate low-velocity-level measurements.
• Do not monitor flows in the manhole invert. The best location for the sensor is 3 to 5 times the
sewer diameter/height upstream of the invert.
• Put monitoring sites as far from inflow junctions as possible to avoid interference caused by
combined flows.
• Objects such as rocks, pipe joints, or valve stems create turbulence and generate high-speed
flows near the object. Make sure the area 2 to 4 pipe diameters in front of the sensor installation is
clear of obstructions. Best accuracy is obtained when there are no flow disruptions within 5 to
10 pipe diameters.
2 Mounting screws (6)
D A N G E R
D A N G E R
English 7