User Manual

System Overview 2-21
Surface Velocity Sensor
Thi s s ensor meas ures the velocity of the flow also by bouncing
signals off the flow surface using a method similar to the ultrasonic
depth sensor, but the velocity signals are angled toward the
oncoming flow surface.
The surface velocity sensor crystals r e sid e in the two descended
portions toward the rear end of the sensor .
ADS does not recommend using this sensor for measuring velocity
at locations with smooth flow surfaces or velocities of less than 1
foot per second (0.3 m/s).
FLOW
SURFACE VELOCITY
Measuring velocit y using the surface velocity s ens or
Surcharge Peak Velocity Sensor
This sensor measures the velocity of the flow during sur charge
conditions using the same methodology as the Peak Combo
Velocity Sensor. Therefore, it will measure velo c ity only when the
pipe is full.
The surcharge peak velocity sensor res ides in the angled, front
portion of the sensor in front of the ultrasonic depth crystals.