TIENet
®
Model 350 Area Velocity Sensor
Section 2 Installation
2-12
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.
The spring ring may need anchoring. Under conditions of high
velocity (greater than 1.5 meters per second or 5 feet per second),
the ring may not have sufficient outward spring force to
maintain a tight fit inside the pipe. The ring may start to lift off
the bottom of the pipe, or may even be carried downstream.
This problem is more prevalent in the larger diameter pipes and
in pipes with smooth inside surfaces, such as plastic pipes. If any
of these conditions are present, or if movement of the mounting
ring is detected or suspected, you must anchor the ring in place.
You can do this by driving screws through the ring into the pipe,
or by other appropriate means. If there is a problem with the
smaller diameter rings, it may be sufficient to simply increase
the outward spring force of the ring by flattening the ring
slightly.
2.5.4 Scissors Mounting
Ring
For pipes larger than 15" in diameter, Teledyne ISCO offers the
adjustable Scissors Ring (also known as the Universal Mounting
Ring). This device consists of two or more metal strips that lock
together with tabs to form a single assembly. There is a base
section where the sensors are mounted, two or more extension
sections (usually), and a scissors section at the top that expands
the entire assembly and tightens it inside the pipe. The scissors
section contains a long bolt that increases the length of the
section as it is tightened.
The assembled scissors rings fit pipe diameters from 16" to 80".
Secure the unit in place by tightening the scissors mechanism
with a
5
/
8
"
socket wrench or other suitable tool. Ring sections are
.040" thick
half-
hard 301 stainless steel sheet. All other parts are
also stainless steel, except for the plastic cable ties in the
hardware kit.
Each extension, 1, 2, 3, and 4, adds 9.0", 21.5", 31.5", or 41.5",
respectively, to the circumference of the ring. Used alone, the
base section fits a pipe that is approximately 16" to 19" in
diameter. The 9.0" (smallest) extensions can be used to take up or
remove slack, to bring the scissors mechanism into a position
where it can be effectively tightened.
Summary of Contents for TIENet 350
Page 2: ......
Page 4: ......
Page 43: ...TIENet Model 350 Area Velocity Sensor Appendix B Velocity Error Codes B 4...
Page 45: ...Warranty...
