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TIENet™ 360 LaserFlow Ex™ Velocity Sensor
Section 2 Preparation and Installation
2.2 Sensor Installation
Considerations
2.2.1 Ultrasonic Beam Angle
Figure 2-4 Ultrasonic level sensor beam angle
2.2.2 High Water Levels
2.2.3 Submersion and
Fouling
2-6
Measurement accuracy can be affected by a number of site
factors that should be taken into consideration when selecting
the location for the sensor.
These factors may affect the laser velocity or the ultrasonic level,
or both.
If the laser velocimeter or ultrasonic transducer cannot obtain a
valid reading at any measurement point, an asterisk (*) will
appear next to the displayed reading, indicating there is an error.
The ultrasonic level transducer has a 10° beam angle (5° from
center line), forming a cone in which the apex is the transducer.
The transducer can only detect surfaces within this cone.
The beam widens as distance to the flow stream increases. If the
beam is too wide, the sensor may pick up signals from unwanted
surfaces, such as the walls of the channel. Narrow channels can
result in false echoes and incorrect level readings from the walls
and sides of the channel. False Echo's can be minimized by using
adjusting the minimum and maximum ultrasonic blanking dis-
tance.
In manhole installations where the level may exceed one-half of
the full pipe, but less than full pipe, mount the sensor as near as
possible to the midpoint between the entrance and exit to
measure over the least turbulent flow.
Where the level may exceed full pipe, the sensor should be
mounted as close as possible to the flow entrance with the bottom
of the sensor level with the top inner surface of the inlet pipe.
Fouling by grease or solids can cause the LaserFlow Ex sensor to
malfunction. The LaserFlow Ex is sealed, so unless it is exposed
to corrosive substances, submersion of 2 meters, up to 72 hours
will not harm it. Upon retrieval from submersion, ensure that
the surfaces of the laser window and ultrasonic sensor are clean.
Cleaning instructions are provided in Section 5.
10°
5°
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