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Figure 2-3 Stainless Steel Strainer
Figure 2-4 CPVC Weighted Strainer
2.5.1 Intake Placement
2.6 Connection to Power
Source
The proper placement of the sampler intake assures the col-
lection of representative samples. Place the intake in the main
flow, not in an eddy or at the edge of flow. The vertical position of
the intake in the flow is important. An intake at the bottom may
result in excess heavy solids and no floating materials, while
placement at the top may result in the opposite.
The suction line tends to float in deep flow streams, dislodging
the line and strainer. The following chart shows the maximum
depths you can submerge the lines and strainers without risks of
flotation. At depths exceeding the safe depths, anchor the line
and strainer securely.
Table 2-1 Strainers
Strainer
1
/
-inch (6 mm)
4
Standard Weighted
Polypropylene
Stainless Steel
14 feet (4.3 m)
Low Flow
CPVC
The 3700 Series must use one of four 12 VDC power sources: an
Isco AC Power Pack, an Isco Nickel-Cadmium Battery Pack, an
Isco sealed lead-acid battery, or an external 12V direct current
source (such as an automotive or marine battery). For complete
information on these power options and how to maintain them,
refer to the Power Products Guide that was shipped with your
sampler.
3700 Portable Samplers
Section 2 Setup Procedures
Vinyl
Vinyl
3
/
-inch (9 mm)
8
—
22 feet (6.7 m)
22 feet (6.7 m)
—
4 feet (1.2 m)
PTFE
3
/
-inch (9 mm)
8
15 feet (4.5 m)
15 feet (4.5 m)
4 feet (1.2 m)
2-5
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