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6712FR Refrigerated Sampler
Section 2 Installation/Preparation
2-8
2.4 Strainers Teledyne Isco offers three styles of strainer that help prevent
solids from clogging the suction line:
•
3
/8-inch standard weighted polypropylene strainer for
routine and priority pollutant sampling
•
3
/8-inch stainless steel low flow strainer
• Weighted CPVC-coated strainer for acidic liquid sources
To select the right strainer for your application, see Table 2-2.
To install the optional low flow strainer in PTFE suction line,
heat the end of the suction line to make it more pliable, then
carefully screw the strainer’s threaded connector into the suction
line.
2.4.1 Alternative to Strainers When sampling from high velocity streams with heavy sus-
pended solids, some field investigations suggest that more repre-
sentative samples are obtained without the strainer. Consider
attaching a short piece of thin walled aluminum tubing to the
end of the suction line; anchor the tubing so that the inlet opens
upstream. The aluminum tubing’s thin wall will not disturb the
flow stream, and most sample analyses disregard aluminum
ions. Under most conditions, the pre-sample purge removes any
debris over the tubing entrance.
Table 2-2 Selecting the Right Strainer
Strainer Dimensions Application Maximum Depth
3/8 Stainless
Steel Ends,
Polypropylene
Center
Routine
applica-
tions.
Vinyl Line:
22 feet (6.7m).
PTFE Line:
15 feet (4.5m).
3/8
Stainless Steel
Low Flow
Low flow
applica-
tions
Vinyl Line:
22 feet (6.7m).
PTFE Line:
15 feet
(4.5m).
3/8
CPVC
Highly
acidic
liquids.
Vinyl Line:
4 feet (1.2m).
Note
• The suction lines will float when filled with air during the purge cycles and when depths exceed the
listed ratings. Secure the suction lines when sampling at depths exceeding the maximum ratings.
• All strainer dimensions are in inches.
• PTFE suction line is compatible only with the
3
/8 stainless steel strainer.
1-1/4
.400
Diameter
Diameter
1
10.5
.400
diameter
7
1
.562
diameter
.400
diameter
1
11.5
1- 5/16
Diameter