ADS Environmental Services FlowShark Pulse QR 775004 A1 - Manual (Page 56)

Installation 6-11
bottom center of the pipe. Higher depth levels and/or flow velocities may produce
erroneous measurements if the sensor is not installed properly.
When using a combi sensor with water-ultrasonic and pressure measurement
capability, environmental conditions, such as the Bernoulli effect, may produce
erroneous measurements in the presence of high flow velocities and low depth levels.
Under these conditions, ADS recommends taking ultrasonic measurements using the
air-ultrasonic sensor from the top of the pipe and pressure depth measurements from
the bottom in the flow simultaneously until flow depth levels reach an adequate depth
to implement water-ultrasonic depth measurement using the combi sensor.
Although the design of the sensor significantly limits build-up from debris in the
flow, the sensor mounting plate is more susceptible to build-up. Therefore, make
sure that no gap exists between the sensor mounting plate and pipe bottom. Seal any
gap or seam that may exist around the tip of the sensor following installation with
silicone or a similar material.
The bottom of the pipe must be completely flat (plane surface) for
sensor installation. Otherwise, the sensor could experience
damage or leakage, resulting in potentially irreparable damage to
the electronic components.
Do not bend the ground plate during installation or removal. Use
only an appropriate screwdriver for sensor removal; do not use a
pry bar, chisel, hammer, lever, crowbar, hammer drill, or similar
tool. In addition, do not use excessive force to remove the sensor.
Do not remove any sensor parts! Removing or loosening the
ground plate and/or cable glands on the sensor will result in
leakage and sensor failure.
For sensors without integrated pressure elements, consider installing the sensor in a
depression at the pipe bottom up to 0.47 inches (12 mm) deep. This will minimize
the lowest measurable depth level and the susceptibility of the sensor to the build-up
of debris. Once installation is complete, fill up the remaining gaps and seams with a
permanently elastic material, such as silicone.
Never countersink combi sensors with integrated pressure
measurement cells. The sealing material on the sides of the
countersunk sensor or accumulated debris/silt could result in
erroneous measurements and/or pressure measurement cell failure.