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Platinum/Optima CVE Refrigerated Sampler
2-18
2.7 Routing Suction Line and
Strainer
Route the suction line so that it has a
continuous slope from the liquid source to the
sampler. This helps to drain the line during pre
and post-sample line purges and rinses. If a
suction line exposed to freezing climates does
not fully drain, there is a risk of liquid in the
suction line becoming frozen. Frozen liquid will
cause the sample collection to fail. A warm
sampling source can usually prevent this,
provided there are no traps or low spots in the
suction line. Some extreme situations may
require more protective measures, such as
insulating the suction line or applying heat
tape or adding a pump heater.
For representative samples, place the strainer
in the main current of the flow stream, not in
an eddy or at the edge of flow. Placing a strainer
at the bottom may produce samples with excess
heavy solids and no floating materials, while
placing it at the top may produce the opposite
conditions.