Teledyne 4250 Installation And Operation Manual page 107

Figure 3-9 Sensor Installed on a Spring Ring
Completing the assembly
Compress ring into gap to install in pipe, then...
...outward force of ring against pipe wall holds
ring in place inside pipe.
Make sure the slots on the sensor are completely pressed onto
the tabs on the ring. This is particularly important where there
is any possibility of reverse flows, or where flows are of high
velocity. If the sensor is not fully pressed onto the mounting
ring tabs, it might come loose in the stream, and could possibly
be damaged or lost.
To complete the sensor-spring ring assembly procedure, attach
the sensor cable to the downstream edge of the ring. Follow the
cable routing shown in Figure 3-9. Other routing directions may
affect measurement accuracy. The cable can actually create a
stilling well downstream from the sensor, causing the level to
read low. Use the self-locking plastic ties supplied with the ring.
Install the ring in the pipe by compressing it. Press inward on
both sides and slide the ring into the pipe.
Route the sensor cable out of the stream and secure it in position
by placing the ties through the holes in the mounting ring and
then locking them around the cable, as shown. To prevent debris
from catching on the cable, it is important to attach the cable to
the mounting ring so it offers as little resistance to the flow as
possible.
4250 Flow Meter
Section 3 Installation
CAUTION
3-17