{"id":2732,"date":"2019-06-03T15:00:28","date_gmt":"2019-06-03T15:00:28","guid":{"rendered":"http:\/\/new.codel.co.uk\/?p=2732"},"modified":"2025-11-26T08:50:33","modified_gmt":"2025-11-26T08:50:33","slug":"dust-monitoring-technology","status":"publish","type":"post","link":"https:\/\/www.codel.co.uk\/pt\/dust-monitoring-technology\/","title":{"rendered":"Dust Monitoring \u2013 Choosing the Right Technology"},"content":{"rendered":"
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Suporte mundial<\/strong>
Over 25 distributors and support centres worldwide<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Contratos de manuten\u00e7\u00e3o flex\u00edveis<\/strong>
Contratos espec\u00edficos de f\u00e1brica sob medida com suporte 24 horas<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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30 years experience<\/strong>
Desenvolvendo, fabricando e instalando<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Dust Monitoring \u2013 Choosing the Right Technology<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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There are several technologies available to monitor dust emitted from collectors. The traditional ones are based on optical systems. However, sensitivity limitations of optical systems have produced an increased use in tribo-electric probes in modern plant.<\/p>

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Opacity Monitors<\/strong><\/p>

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These instruments must be used when the required measurement is opacity and are the preferred option for dust density (mg\/m\u00b3) measurement on almost all schedule \u2018A\u2019 processes. To measure dust density, opacity monitors, like all other techniques covered by this publication, require calibration against an iso-kinetic stack test.<\/p>

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The very best opacity monitors can achieve an accuracy of \u00b10.2% opacity, with more typical performance being in the \u00b11% to \u00b12% range. This limits their use on smaller ducts and particularly when dust levels are vey low (0.2% opacity would typically represent 2-4mg\/m\u00b3 in a 2 metre duct or 4-8mg\/m\u00b3 in a 1 metre duct). Modern dust collectors achieve very high efficiencies and although opacity monitors are very reliable devices, their sensitivity limitations must be considered when making the choice of monitoring technology.<\/p>

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For indicative monitoring they are rarely the most cost-effective solution as the price range varies significantly depending on the application conditions for why they have been designed.<\/p>

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Back-Scatter Monitors<\/strong><\/p>

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These instruments project a light into the duct from one side and detect light scattered back from the dust. They are capable of detecting very low levels of dust in small ducts, beyond those required for monitoring most collectors. Critical alignment is not necessary, but they do require air purges to keep their lenses clean. Also, stray light reflecting from the duct causes zero measurement errors. The main draw-back, however, is their higher cost.<\/p>

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Light Modulation Technology<\/strong><\/p>

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These instruments use a technology known by a variety of names, \u2018scintillation<\/em>\u2019, \u2018dynamic transmission<\/em>\u2019, \u2018light modulation<\/em>\u2019 and \u2018flicker<\/em>\u2019. Essentially, they are similar to opacity meters in that they have two heads, with light being transmitted one to the other. Instead of monitoring the average attenuation of light by the dust particles, these instruments measure only the short-term fluctuations in the transmitted light. They assume that the amplitude of the alternating component, or \u2018flicker\u2019 is proportional to the particulate concentration within the stack.<\/p>

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Such instruments are influenced by the degree of turbulence and flow of the gas. Additionally, refraction effects caused by hot turbulent gases can produce significant flicker signals even in totally clean conditions. They are also sensitive to vibration that can induce an interfering alternating component into the signal.<\/p>

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These varied sources of error make the technology unsatisfactory for the measurement of very low dust concentrations.<\/p>

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Tribo-Electric Instruments<\/strong><\/p>

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Dust particles moving through a collection system cause an electrical charge transfer as they strike the inner surfaces of the duct. This results in particles within the gas stream carrying a net electrical charge. A conductive probe inserted into the gas stream will gain charge from these particles as they strike the probe.<\/p>

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Assuming the amount of charge held by a particle is proportional to its mass, the electrical signal developed at the probe (dependent on the rate of charge transfer), will be proportional to the mass flow of dust particles in the gas stream.<\/p>

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The tribo-electric technique is extremely sensitive, capable of detecting dust concentrations of less than 1 mg\/m\u00b3 in small ducts. These instruments are\u00a0easy to\u00a0<\/strong>install, requiring only a simple probe and are ideal for small duct sizes. Minimal maintenance, restricted to infrequent probe cleaning and low installation\u00a0costs<\/strong>\u00a0make this technology extremely attractive for dust collector monitoring.<\/p>

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CODEL\u2019s Triboelectric Monitoring Range offers a high performance and cost-effective solution for dust monitoring.<\/p>

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Click here to find out more about our Triboelectric Monitoring Range<\/a><\/p>

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Para obter mais informa\u00e7\u00f5es sobre qualquer um de nossos produtos, preencha nosso formul\u00e1rio e um membro da equipe responder\u00e1 o mais r\u00e1pido poss\u00edvel.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Voc\u00ea tamb\u00e9m pode ligar: +44(0)1629 814351<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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