For gas and vapour sampling, a volume of air is adsorbed onto a sampling medium held in glass sampling tubes. To enable a high flow sampling pump to operate at low flow rates (200mls/min) a low flow adaptor assembly is used which acts as a throttle to slow the sampling rate down on a standard air sampling pump.
This is another commonly used sorbent tube and is suitable for polar hydrocarbons, methanol, amines, inorganic acids and low molecular weight mercaptans (thiols). Some of the tubes in the range are pre-treated (e.g. with 2,4-dinitrophenylhydrazine) for sampling of specific chemical hazards.