Hach US9001 Manuel D'utilisation page 13

Figure 12 Leopold-Lagco Flume
Figure 13 H Flume
Install for a redundant level measurement
The ultrasonic sensors can be used for redundant level measurement, such as with a Sigma area
velocity sensor and AV9000 analyzer module, Flo-Dar sensor or Flo-Tote sensor.
The most common example of a redundant level measurement is with the submerged pressure area
velocity sensor. The area velocity sensor is typically installed at the base of the pipe on a spring band
or scissor band. The ultrasonic sensor is installed at the crown of the pipe. The two sensors are
connected to a FL series flow logger or AS950 sampler. Refer to Figure 14.
English 13