Alternative To Strainers; Max Unanchored Length - Teledyne Platinum Pocket Manual

Section 2 Installation
into the line. Warming PTFE-lined tubing will
make it more pliable to avoid damage.

2.6.1 Alternative to Strainers

When sampling from high velocity streams
with heavy suspended solids, some field
investigations suggest that more
representative 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, a pre-sample line rinse
removes any debris over the tubing entrance.

2.6.2 Max Unanchored Length

During a pre or post-sample purge or line rinse,
the suction line is filled with air which might
cause the suction line and strainer to float. If
the length of the suction line and strainer
exceeds the listed value, securely anchor the
strainer.
Even if the maximum length is not exceeded, it
is a good idea to anchor the suction line and
strainer when sampling from high velocity or
turbulent flow streams.
2-17