SKC Limited Universal Pump Step By Step Guide - Manual (Page 15)

www.skcltd.com 224-G3 Issue C Page 13
Gas & Vapour Sampling using Impingers
Impingers are typically run at a low flow rate of 1.0
litre/minute. It must first be decided if you are going
to carry out personal or static sampling. If personal
sampling is the method adopted you will require an
impinger pouch and an in-line trap. If static sampling
is more suited an impinger bracket and glass trap
should be used.
Note: Although personal sampling is recommended
by the HSE and the limits in EH 40 are based on
personal exposure, some thought must be given to
the fact that placing glassware filled with, in some
cases, hazardous liquids does present a hazard in
itself. It may, in your opinion, be safer to take samples
on a static basis.
The following section describes how to sample with
impingers on a STATIC basis at a flow rate of 1.0 litre/
minute. If you plan to sample on a personal basis use
an in-line trap and a pouch to attach to a subject.
Details shown in the text on personal sampling are
identified in italics and contained in brackets. You will need :-
• Universal sample pump (fully charged)
• Impinger
• Impinger trap and trap sorbent
• Flexible tubing
• Bracket (or pouch)
• Flow calibration device capable of measuring the
flow rate intended to be used
•
Toolkit to adjust the flow rate
For Low Flow Impinger Sampling
Please refer to the previous section on sorbent tube
sampling. The set up for sampling with an impinger at
flow rates below 500 ml/min is the same as this except
the impinger and trap assembly is substituted in place
of the sorbent tube.
0
5
0
5
0
5
3
3
2
2
1
1
0
0
1. Fill the trap with trap sorbent until all of the
holes in the central tube are covered. (Make
sure that the in-line trap is full of sorbent).
2. Connect from the pipe stub protuding
from the side of the impinger top to the
pipe stub sticking vertically from the trap.