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far ailleurs, le mre gravimetrie dust-sampler peut être relié à un dispositif permettant de
the basic instrument, the mre gravimetric dust sampler, can also be fitted with a device to measure the oxides of nitrogen contained in the ventilating air (iom
- la directive doit-elle porter sur les particules en suspension mesurées par gravimetrie ou comme fumées noires;
- whether the directive should cover suspended particulates measured gravimetrically or as black smoke,
environ 0,2 1 d'air filtré par minute traverse ce dispositif complémentaire, soit environ 10$ du volume total d'air aspiré par le mre gravimetrie dust sampler.
around 0.2 1 of filtered air per minute pass through this attachment, i.e. about lojí of the total air aspirated by the mre gravimetric dust sampler.
3 mesure de la concentration numérique [en nombre de particules par cm d'air, par exemple), la mesure de la concentration pondérale ou gravimetri-
for the medical man, the ideal sampling should enable the measurement of numerical concentration (in number of particles per cm of air, for example), the weighted or gravimetric concentration (in mg/m , for example), research into the size distribution of the dust (numerical and weighted size consist) and air analysis of the constituents and ultimately the shape of particles.