Casella CEL Sampling heads for personal dust sampling - Manual (Page 14)

5.2 Impinger
Impingers are ideal for applications where the airborne contaminant must be
captured by drawing them into a solution. The air is drawn into the impinger
and forced through a nozzle that is immersed in a liquid. This liquid is
subsequently analysed for any dissolved matter.
5.2.1 Arnold Bubbler / Impinger Equivalent
(Part No. P100011)
The Arnold bubbler is used for sampling
gas, normally in static situations. The
solution used in the bubbler is
dependent upon the gas to be sampled.
The bubbler is filled with sorbent, for
example de-ionised water, and the
sample air is drawn through it.
Note that it is necessary to fit an
activated-carbon filter between the
bubbler and the pump to prevent
moisture and/or corrosive vapour
entering the pump.
5.2.2 Operation of the Bubbler
1. Fill the Arnold bubbler with a sorbent.
2. Connect the bubbler to the pump via the charcoal filter.
3. Connect the bubbler to the flowmeter.
4. Adjust the flow rate to the required amount:
Below 200 ml/min use a dry flow flowmeter.
Above 200 ml/min use a flowmeter.
Gas & Vapour
Page 14 of 24
SAMPLING HEADS AND ACCESSORIES
Users Guide