Installing the ring – ADS Environmental Services Model 3600 530002 A2 User Manual
Page 50
Ring, Sensor, and Special Installations
4-17
Installing the Ring
Caution:
Ring installation requires entering a dangerous environment. Be
extremely careful and follow all government and ADS safety procedures.
l
Designate one person to enter the manhole and install the ring. First, have the
installer enter the manhole and position himself or herself to receive the ring.
The installer should examine the sewer pipe to ensure that nothing is
obstructing the flow or will inhibit installation.
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Using the prepared mounting assembly ring, with its pre-mounted sensors,
uncoil the cables and prepare to lower the ring into the manhole.
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Lower equipment in a bucket into the manhole. The bucket should contain
G small, medium, and large cable ties,
G a nut driver (7/16 in. or 11 mm),
G 10 1/4 in. stainless steel anchor bolts or 10 plastic cable anchors,
G a carpenter's level,
G a hammer,
G pliers,
G a depth of flow (DOF) stick (folding carpenter's rule),
G diagonal cutters, and
G a cranking handle.
l
Lower the sensor mounting assembly ring into the manhole. Be careful not to
bump the assembly against the walls of the manhole. If possible, the installer in
the manhole should grasp the ring to stabilize it while it is being lowered.
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Adjust the ring size to slightly less than the actual pipe diameter.
l
Orient the ring so that the pressure sensor and velocity sensor both face
upstream so that all sensor cables run downstream and away from the ring.
Also, orient the ring so that the ultrasonic depth sensor is on the top and the
velocity sensor and pressure sensor are on the bottom.
G If silt exists in the monitored line, measure its depth before it is disturbed.
G If silt exists in the pipe, clear enough silt to allow installation of the sensor
mounting assembly. Place the silt upstream of the sensor installation
position in the incoming line, either in the invert, or on the apron. You will
need this silt later in the installation process to fill the hole left around the
mounting assembly.