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MAP20071017537Niemelä, R.The Measurement of ventilation parameters by means of tracer gas techniques and a microcomputer / R. Niemelä, E. Toppila and A. TossavainenSumario: A tracer method was developed for the evaluation of workplace ventilation. Nitrous oxide or freon was used of the tracer. The concentration of the tracer gas was measured with an infra-red analyser. The versatility of the tracer technique for industrial hygiene applications was improved by the use of a microcomputer for data calculation, display and storage. Three applications are presented: determination of the capture efficiency of a local exhaust hood; the evaluation of the air leakage of a room; and measurement of the local ventilation rates in a la large industrial plantEn: The Annals of occupational hygiene. - Oxford [etc.]. - nº 2, 1984 ; p. 203-2101. Higiene industrial. 2. Contaminación atmosférica. 3. Control de la contaminación. 4. Ventilación. 5. Aire. 6. Métodos de análisis. 7. Sistemas informáticos. 8. Ordenadores. I. Toppila, E.. II. Tossavainen, A.. III. Título. IV. Título: The Annals of occupational hygiene.