4230 Flow Meter
Section 3 Installation
3-17
no restriction to flow. Moreover, with the Universal Mounting
Ring, pipe sizes of as much as 72” in diameter can be accommo-
dated.
Figure 3-6 Flow Metering Insert
The insert consists of a metal collar surrounded by an inflatable
rubber bladder. A removable metal plate, formed with a V-notch
opening, attaches to the upstream side of the insert. Each insert
also contains a bubble line for a 4230. The rubber bladder,
inflated by a removable, foot-powered pump, holds the insert
securely in place after you install it inside the pipe.
The metal plate, attached to the insert, forms a V-notch weir
inside the pipe. If you remove this V-notch plate from the insert,
an off-center round opening appears in the insert. This opening
is 60% of the nominal pipe size. If flow in the pipe exceeds
1
/4 to
1
/3 of full capacity, Isco recommends you use the round orifice
rather than the V-notch plate.
CAUTION
The flow metering inserts create a restriction in the flow stream
and a corresponding head loss. Use them with care in flow
streams with suspended solids, or high grease content, such
as sanitary sewers.
The inserts may cause clogging, requiring maintenance.
Where this is could be a problem, we suggest using the Bub-
bler Tube Retainer with an Isco Mounting Ring instead.
The inserts are anodized aluminum and are corrosion-resistant.
However, you should avoid using them in flows with agents
capable of attacking either the aluminum (strong alkalies) or the
rubber bladder (certain organic solvents).
Rubber Bladder
Bubbler
Handle
Orifice
Round
Air Line
Flow
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