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Hydrological Equipment

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Ultrasonic Velocity Meter Transducer Mounts

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0.00 LBS
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Measuring water flow in a canal, estuary, reservoir or bayou is often a challenging project as 1) the water velocity is often below the measuring range of the flow instruments, and 2) stage often has no direct relation to discharge. Measuring slow or oscillating flow can now be easily done by installing and using an ultrasonic velocity meter (UVM). The UVM sends sound pulses back and forth between a pair of acoustic transducers and measures the time required for the sound to travel in each direction. The transducers are mounted on opposite sides of the river at an angle to the water flow. The sound pulse travelling against the flow takes a longer time to travel from one transducer to the other, as compared to the sound pulse travelling with the flow. If the flow is zero, the sound will take an equal amount of time to travel in each direction. A major part of installing the UVM is to mount the transducers in the water. These mounts must be rigid, and must hold the transducers so that they point directly at each other. There is an allowable aiming error of approximately 3 degrees, which includes both horizontal (azimuth) error and vertical (elevation) error.


  • The mounts are rigid to hold the transducers within the allow able aiming angel under all reasonable conditions. 
  • The mounts are adjustable so that the transducers can be aimed at each other, even if the supporting structure is not vertical or level. The mounts should be able to adjust for supporting structures that are leaning at an odd oblique angle, including structures that are leading both to one side and forward (towards the acoustic path) or back (away from the acoustic path). 
  • The mounts are attachable to concrete pilings without drilling into the pilings. 
  • The mount assemblies are low-profile to minimize the possibility of debris snagging on the transducers or knocking them out of alignment and the mount assembly is strong enough so that it is not disturbed by river ice formation or breakup. 
  • The mount is moveable in the vertical direction so that the transducer assembly can be raised above the water surface for inspection, aiming adjustment or repair, then returned to the operating position with the correct aiming settings.