Teledyne 4220 - Manual (Page 103)

4220 Flow Meter
Section 4 Submerged Probe Installation
4-9
To prevent debris from catching on the cable, it is important to
attach the cable to the mounting ring so it offers as little resis-
tance to the flow as possible. Attach the sensor cable to the down-
stream edge of the ring, using the self-locking plastic ties
supplied with the ring. Place the ties through the holes in the
edge of 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.
Figure 4-5 Universal Mounting Ring Adjustment
4.3.3 U-Channel or Invert
Mounting
It is possible to mount a probe in a U-channel or invert, but you
will not be able to use the complete ring. You can use the base
section only, and attach it to the U-channel surface with studs
fired from a power-activated stud gun. Consult the factory for
more information, if you must mount a sensor in a U-channel.
4.3.4 Power-Actuated Stud
Gun
If the conditions of your flow stream indicate that a more secure
m e t h o d i s n e e d e d t o h o l d a m o u n t i n g r i n g i n p l a c e, a
power-actuated stud gun is recommended. The stud gun may be
rented or purchased locally. Also required are
1
/ 4 in. - 20 U.N.C.
threaded fasteners and power loads for the stud gun. The
threaded fasteners are the studs that are shot into the wall of the
channel by the gun.
Scissors Assembly
Extensions
Base Section Tightening the scissors assembly expands the ring to
press firmly against the pipe wall, securing the ring.