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2.5.3 Sensor Positioning and
Requirements
a
Center of the pipe
Top of pipe inside wall
*
Distance from sensor tip to laser
beam exit point (vertex of 45° angle)
Figure 2-16 Sensor installation constants
Figure 2-16, at left, shows constants that serve as reference
points when planning the positioning of the sensor.
Figure 2-17, shows a typical LaserFlow manhole installation.
For proper function, the requirements listed here must be fol-
lowed exactly.
Requirements:
• Permanent Installation: Install the wall bracket perpen-
dicular to the x-axis.
Temporary Installation: Install the cargo bar perpen-
dicular to the y-axis.
• Always center the LaserFlow (and middle laser beam)
relative to the pipe walls, and always use the attached
circular bubble level for vertical alignment.
a
• Mount the LaserFlow sensor with the bottom parallel
with the water surface.
• Align the bottom of the LaserFlow with the top of the
inside wall of the inlet pipe, and as close as possible to
the pipe mouth without obstructing the laser.
To accomplish this, refer to Figure 2-16 at left,
Figure 2-17 on the next page, and the following
important figures:
· The point at which the laser exits the sensor mouth is
3.3" (8.4 cm) from the front tip of the sensor, or the
center of the opening.
· The distance from the bottom of the Laserflow sensor
to the center of the coupling tube is 10.375" (26.35
cm).
· The laser beam exits the sensor mouth at a 45°
angle.
(If the sensor bottom is parallel with the water
surface, the laser beam will also strike the water
surface at a 45° angle.)
3.3"
TIENet™ 360 LaserFlow™ Velocity Sensor
Section 2 Preparation and Installation
CAUTION
2-15
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