BS EN 482:2006 pdf download.Workplace atmospheres—General requirements for the performance of procedures for the measurement of chemical agents.
4 Classification
4.1 General
In this document measunng procedures are classified according to measurement task. This classflcation is based upon the measurement strategy laid down in EN 689.
NOTE EN 669 descnbes a numbet of measurement categories siat mvOlve a ccmhealion of these measurement tasks (see Annex A),
4.2 Screening measurements of time weighted average concentration
Screening measurements of time weighted average concentration ere performed to obtain relatively crude quantitative information on exposure levels in order to decide if an exposure problem exists, and if so, to appraise its possible seriousness. These measurements can also determine if the exposure is well below or well above the (occupational exposure) limit value.
4.3 Screening measurements of variation of concentration in time andlor space
Screening measurements of variation of concentration ii time andlor space are used to:
— provide information on the likely pattern of the concentration of chemical agents in air;
— identify locations and periods of elevated exposure;
— provide information on the location and intensity of emission sources;
— estimate the effectiveness of ventilation or olher technical measures.
4.4 Measurements for conipanson with (occupational exposure) limit values and periodic measurements
Measurements for comparison with (occupational exposure) lImit values are used to obtain results of known precision and accuracy for the average concentration of a chemical agent In the air in a worker’s breathing zone.
Periodic measurements are used to determine whether exposure conditions have changed since the measurements for comparison with limit values were performed, or whether control measures remain effective (see EN 689).
NOTE Since the composition of the workplace atmosphere will have been investigated during the initial oCc5tional exposure assessment. ii fmght be appropnate br periodic measurements to use procedures with lower selectivity.
4.1 General
In this document measunng procedures are classified according to measurement task. This classflcation is based upon the measurement strategy laid down in EN 689.
NOTE EN 669 descnbes a numbet of measurement categories siat mvOlve a ccmhealion of these measurement tasks (see Annex A),
4.2 Screening measurements of time weighted average concentration
Screening measurements of time weighted average concentration ere performed to obtain relatively crude quantitative information on exposure levels in order to decide if an exposure problem exists, and if so, to appraise its possible seriousness. These measurements can also determine if the exposure is well below or well above the (occupational exposure) limit value.
4.3 Screening measurements of variation of concentration in time andlor space
Screening measurements of variation of concentration ii time andlor space are used to:
— provide information on the likely pattern of the concentration of chemical agents in air;
— identify locations and periods of elevated exposure;
— provide information on the location and intensity of emission sources;
— estimate the effectiveness of ventilation or olher technical measures.
4.4 Measurements for conipanson with (occupational exposure) limit values and periodic measurements
Measurements for comparison with (occupational exposure) lImit values are used to obtain results of known precision and accuracy for the average concentration of a chemical agent In the air in a worker’s breathing zone.
Periodic measurements are used to determine whether exposure conditions have changed since the measurements for comparison with limit values were performed, or whether control measures remain effective (see EN 689).
NOTE Since the composition of the workplace atmosphere will have been investigated during the initial oCc5tional exposure assessment. ii fmght be appropnate br periodic measurements to use procedures with lower selectivity.
