ÖNORM EN 1076

This European Standard specifies performance requirements and test methods under prescribed laboratory conditions for a pumped sorbent tube used in conjunction with an air sampling pump for the determination of gases and vapours in workplace atmospheres. Additional tests designed to establish whether the performance characteristics of the pumped sorbent tube are affected by the wider range of environmental influences that may be encountered in field use are described in annexes C and D. If there is no pumped sorbent tube for measuring a particular chemical agent which meets the requirements of this European Standard, it is recommended to use a pumped sorbent tube whose performance is nearest to the specif ied requirements, Some of the test methods described in this European Standard require the use of an air sampling pump. The specification for such a pump is covered by EN 1232. The European Standard is applicable to pumped sorbent tubes which are used for the indirect determination of concentrations, by sampling and analysis in separate Stages. These tubes can be divided into: - type A samplers which rely on sorption onto a solid or onto a support impregnated with a reagent, desorption with solvent, and subsequent analysis of the desorbate; - type B samplers which rely on sorption onto a solid or onto a support impregnated with a reagent, desorption by heat, and analysis of the desorbate. NOTE 1 : Type A samplers usually consist of two beds of sorbent in series, i.e. with a back-up section, and contain an active sorbent (e. g. charcoal) or a support impregnated with reagent. The back-up section is not used in the breakthrough tests, but in field use is a protection against unexpected breakthrough. NOTE 2: Type B samplers usually consist of a single bed of active sorbent (e. g. porous polymer resin). Specific aspects of the use of reagent impregnated Systems will be covered in additional parts o (...abbreviated)