Pipe Saddle
(ref.)
Gasket
(ref)
Ball Valve
e . Slide the collar along the shaft until its bottom surface is at the mark on the stem .
Tighten the cap screw on the collar . When the sensor is reassembled, this will set the
insertion depth of the sensor . Make sure to hold the sensor up tight against the cover
when installing it onto the valve, to prevent the possibility of damaging the impeller
by striking the closed ball of the valve .
11 . Slide the cover down the stem until it stops .
12 . Attach the sensor to the valve by inserting the impeller end of the stem into the valve
until the cover touches the top of the valve . The sensor tip and impeller will be in the
section of the valve above the ball .
13 . Tighten the cover against the O-ring in the top of the valve . This will seal the
sensor assembly .
14 . Open the ball valve again by slowly rotating the handle 90° . If the cover was not at the
bottom of the sensor stem, water pressure from the pipe would now push it out until it
stops . However, the sensor cannot be ejected from the pipe if the cover is secured to the
valve . Check to make sure all joints are tight .
15 . Insert the flow sensor stem into the pipe by pushing against the top of the electronics
housing with a slight twisting motion until the stem collar meets the cover . The force
required to push the sensor into the pipeline is approximately 20% of the line pressure .
Be aware of the close spacing between the diameter of the flow sensor, the bore of
the ball valve and the hole in the pipe . If the sensor stops or “catches” before the stem
collar meets the cover, apply a gentle rocking/twisting motion to the sensor to continue
its travel .
16 . While holding the flow sensor collar against the cover, thread the hex cap onto the cover
to hold the flow sensor in place, but do not tighten .
17 . Align the flow sensor with the pipe by using the flat side cover of the electronics
housing as a guide . Place a straightedge along the cover and rotate the sensor until the
straightedge is parallel to the pipe as shown in
Figure 10
.
18 . Tighten the hex cap to the cover to approximately 10 ft-lb . The hex cap holds the sensor
alignment and depth but performs no sealing functions .
DO NOT OVER TIGHTEN.
19 . Pressurize the pipeline and check for leaks .
Pipe Saddle
(ref.)
Gasket
(ref)
Ball Valve
Stem Collar
Stem
Hex Cap
Cover
Figure 9:
Sensor tip and stem collar
Straight Edge Parallel to Pipe
Pipe
Pipe
SDI
Flow Sensor
Figure 10: Level the sensor
Mechanical Installation
Page 12
May 2017
SEN-UM-00217-EN-10
