Glacier Transportable Sampler - Isco

Glacier Transportable Sampler
Section 2 Installation
For sampling from highly acidic flow streams, a weighted, CPVC
plastic-coated strainer is available (Figure 2-8).
The use of the strainer is optional. When heavy suspended solids
are involved and flow stream velocities are significant, some field
investigation results indicate that more representative samples
are obtained without the strainer.
You can purchase bulk suction line without strainers. Refer to
the Accessories List in the back of this manual. The strainer prevents
solid particles larger than a specific diameter from
entering and clogging the suction line. Teledyne Isco recommends
its use for bottom sampling or sampling from streams containing
large solids. The 1 /4-inch strainers supplied for use with
the 1 /4-inch ID suction line have 15 /64-inch (0.56 cm) diameter
holes. The 3 /8-inch strainers supplied for use with the vinyl or
PTFE 3 /8-inch ID suction line have 23 /64-inch (0.9 cm) diameter
holes.
2.8.5 Intake Placement The proper placement of the sampler intake assures the collection
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. Table 2-2 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.
The suction line should always be cut to the shortest possible
length. Route the suction line so that it runs continuously
downhill. Loops of coiled suction line or low areas where the
liquid can pool will hold residual amounts of liquid that will
cross-contaminate sample volumes. A consistent downhill slope
will help eliminate air slugs in the line, increasing the
sample-to-sample repeatability and accuracy.
Note
The suction line should maintain a consistent downhill slope to
achieve the best sample-to-sample repeatability and accuracy.
Strainer
Table 2-2 Strainer/Suction Line Depths
Vinyl
1 /4-inch (6 mm)
Vinyl
3 /8-inch (9 mm)
PTFE
3 /8-inch (9 mm)
Standard Weighted
Polypropylene
Stainless Steel
Low Flow
— 22 feet (6.7 m) 15 feet (4.5 m)
14 feet (4.3 m) 22 feet (6.7 m) 15 feet (4.5 m)
CPVC — 4 feet (1.2 m) 4 feet (1.2 m)
2-13