4230 Flow Meter
Section 4 Optional Equipment
4-29
When assembling the ring sections, make sure the tongue sec-
tions are correctly inserted into the slotted sections. Note the
accompanying diagram. A flat blade screwdriver may help slide
the tongue sections through the slots and over the securing
buttons. In large pipes, you may find it useful to assemble the
base and extensions above ground, (without connecting into a
circle), before entering the manhole. Then you can pass it down
the manhole. (Do not drop it; a large assembly could be badly
bent.) Once maneuvered into the pipe, you can install the
scissors mechanism. Different pipes, under varying conditions,
may require different ways to install the particular assembly.
The hardware kit provides plastic cable ties to secure probe
cables along the back of the ring. It also includes flat head bolts
and nuts you can use to bolt sections of the ring assembly
together. This is recommended when installing the ring in the
larger pipe sizes, while significant flow exists. The ring can
thrash around during installation, (before you can tighten the
scissors mechanism) if there is high flow. Bolting the tongue sec-
tions together can greatly increase safety and prevent the
assembly from being torn apart.
The three sets of mounting tabs on the base section are for
mounting the Isco flow and parameter probes.
Make sure the probe engages both tabs properly and com-
pletely.
Fastening the cable along the back of the ring with the cable ties
provided will then completely secure the probe to the ring.
Note
There are countersunk holes on the base section near the
mounting tabs for the probes. These holes are for use with the
Isco Probe Extension only. Do not attempt to use them to
mount the probe carriers or the probes themselves.
4.10.6 Finishing the
Installation
You can assemble the sections of the Universal Mounting Ring
together and lower the assembly into the manhole where instal-
lation is to take place. Or, you can assemble the parts at the
bottom of the manhole, whatever is most convenient to you. Do
not try to assemble the larger ring assemblies in pipes during
conditions of high flows. Always try to make installation during
times of lowest flow, both for reasons of greater ease of instal-
lation and for reasons of safety. On the next page is an illus-
tration of the Universal Mounting Ring components.
4.10.7 Four-Foot Probe
Extension
You can install the parameter probes by other means or with
custom hardware, whatever is appropriate for your situation. For
installations where you need to mount the parameter probe
further upstream from an outfall, a four-foot probe extension is
available from Isco.
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