4230 Flow Meter
Section 3 Installation
3-18
3.7 The Bubbler Tube
Retainer Assembly
For situations where the Flow Metering Inserts are not an ideal
solution, Isco offers the Bubbler Tube Retainer Assembly for
installation inside round pipe. This system uses a bubbler tube
attached to a snap-on probe carrier similar to those used for the
other probes (see Section 4).
Figure 3-7 Bubbler Tube Retainer Assembly
The carrier snaps onto the mounting tabs of a stainless steel
ring. The ring itself fits inside the pipe. Isco offers two systems:
one that attaches to an Isco Mounting Ring for pipes with diam-
eters 15 inches or less. For pipe sizes from 18” to 72” in diameter,
Isco offers the Universal Mounting Ring. These rings are
designed to accommodate various Isco submerged probes, all
installed with the same easy snap-on carriers.
Detailed information on the installation of probes, etc. on rings
inside round pipes is provided at the end of Section 4.
3.8 Connection to a
Sampler
The following sections describe connecting the 4230 to Isco and
non-Isco samplers.
One of the uses of the 4230 Flow Meter is to control a sampler in
a flow-paced sampling mode. Flow-paced sampling means that
the flow meter signals the sampler to take a sample after a
certain volume of flow has passed through the flow stream,
rather than after a particular period of time. In this mode, the
sampler and flow meter are able to compensate for varying flow
rates.
You can use the 4230 Flow Meter with most Isco samplers and
with most other manufacturers' samplers as well.
An optional 25-foot (7.6 m) long connect cable is available to
connect the flow meter to the sampler. Attach the 6-pin female
connector on the cable to the Sampler connector on the side of the
flow meter. (This is the second connector from the top.) Attach
the connector on the other end of the cable to the Flow Meter con-
nector on the sampler. This also connects the flow meter to the
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