Simplified Eye-piece Graticule for Assessing Thermal Precipitator Dust Samples
نویسندگان
چکیده
منابع مشابه
Counting errors due to overlapping particles in thermal precipitator samples.
A sample of airborne dust taken with the standard thermal precipitator consists of two deposits about 1 cm. long and 1 mm. wide obtained from either side of the heated wire (Green and Watson, 1935). These deposits are examined under a microscope and a count is made across each of them to estimate the number of particles collected. The particles commonly have an irregular shape and some consist ...
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Ideally, in order to relate dust concentrations expressed in terms of one parameter, e.g., number per unit volume, with those expressed in terms of another parameter, e.g., mass per unit volume, the particles counted by microscope in a thermal precipitator sample should be within the same size range as samples collected by other means for the determination of mass concentration. It is generally...
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The standard thermal precipitator has been modified for field surveys of airbome dust exposureso as to make it more portable. A microprojector is used when assessing the samples and for coal-mine dusts the counts are restricted to the range 0 5 to 5 microns. In industrial environments the dust concentration appears to vary with a standard deviation of more than 50% of the mean. Part of this var...
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Control of Particulate matter (PM) emission is a key pollution issue affecting the environment and human health, especially sizes that range below 10 μm. The objective of this work is to develop a dust flow separator type electrostatic precipitator (DFS-ESP) for the effective control of fine particulate matter emission from natural gas combustion. An experiment was conducted for natural gas com...
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ژورنال
عنوان ژورنال: Occupational and Environmental Medicine
سال: 1952
ISSN: 1351-0711
DOI: 10.1136/oem.9.1.80