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2150EX Area Velocity Flow Module
Section 2 Preparation and Installation
2-32
Figure 2-22 Scissors Ring adjustment
To prevent debris from catching on the probe cable, it is
important to attach the cable to the mounting ring so it offers as
little resistance to the flow as possible. Attach the sensor cable to
the downstream edge of the ring, using the self-locking plastic
ties supplied with the ring. Place the ties through the holes in the
mounting ring and then lock them around the cable.
CAUTION
Do not overtighten the plastic cable ties; they should be tight-
ened just enough to secure the cable in place, without greatly
indenting the cable. Overtightening the plastic ties may col-
lapse the reference tube in the cable, blocking it.
2.8.3 Completing the AV
Sensor Installation
The AV sensor installation is finished by securing any excess
sensor cable using cable clamps or other means.
The reference tube inside the cable can be restricted or blocked if
the cable is kinked, sharply bent, coiled, or otherwise pinched.
The sensor cable should be handled and mounted with care. Also,
if there is any appreciable distance between the point where the
sensor cable leaves the mounting apparatus and the location of
the flow meter, be sure to attach the cable to the flow stream wall
to prevent it from vibrating, moving around, tangling, or possibly
collecting debris.
WARNING
Do not coil the sensor cable. This will form an inductor and
create hazard.
Scissors Assembly
Extensions
Base Section Tightening the scissors assembly expands the ring to
press firmly against the pipe wall, securing the ring.