Leading specialists in the design and development of industrial instrumentation for opacity, dust and particulate monitoring +44 (0)1280 850521
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Opacity monitors Request a quote… The history of air pollution regulation dates back as far as the 13th century when in 1273, Edward I (Longshanks) of England prohibited the burning of sea coal in London. The smoke produced by its combustion was considered detrimental to human health.
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By the late 19 th and early 20 th centuries, regulations were being passed that sought to control air pollution predominantly for smoke and odour control. Traditionally, regulators were concerned with the visual impact of the discharge from a stack or chimney. Therefore, emission limits were expressed in terms of colour or opacity. Modern methods for opacity measurement still use the darkness of the stack gases to measure the amount of smoke or dust emitted within the exhaust gases. DynOptic opacity monitors use the light transmission technique to measure the visible opacity of exhaust gas in a duct, stack or flue, in which a high intensity light beam is projected across the stack. Any dust, smoke or particulate present will attenuate the transmitted light and the decrease in light intensity, due to absorption and scattering, is measured. One advantage of opacity systems is that they are insensitive to interference from other flue gas components since the beam spectrum is within the photopic region (400-700 nm) and most other flue gas constituents do not absorb in this spectral region. There are two types of opacity monitors; Single Pass and Double Pass. Single pass opacity monitors have a Transmitter/Receiver arrangement with the light beam emitted from the Transmitter passing across the stack to a Receiver. Double pass opacity monitors have a folded beam Transceiver/Reflector arrangement with the light beam emitted from the Transceiver (TRX) passing across the duct to a Reflector, which then returns the light to the Transceiver. Single pass opacity monitors are the simplest type of instrument and offer a very cost effective solution to meet monitoring requirements. One advantage to single pass systems is that they are suitable for applications with long path lengths, i.e. large stack diameters and DynOptic single pass opacity monitors can be used for path lengths of up to 20m. Double pass systems are more suited to continuous emission monitoring as they have a number of advantages over single pass systems in that: Double pass opacity monitors have better sensitivity at smaller duct diameters Double pass opacity monitors are simpler to install as electrical services are only required to one side of the stack Double pass opacity monitors allow for an in-situ zero and calibration facility DynOptic currently offers three different opacity monitors. DSL-220 MkIII Single Pass Opacity Monitor DSL-320 MkIII Double Pass Opacity Monitor DSL-460 MkII Double Pass Opacity and Particulate Monitor
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DSL-330 MkIII - standard double pass particulate monitor for measuring particulate density (mg/m³) in combustion and air filtration processes.
DSL-220M - Lloyds Type Approved smoke opacity monitor for measuring visible opacity (0 – 100 %) in marine boiler and diesel engine exhaust gases.
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Contact us DynOptic Systems Limited Tel +44 (0)1280 850521 Email
[email protected] Visit www.dynoptic.com Furlong House, Crowfield, Brackley, Northamptonshire, NN13 5TW United Kingdom
DSL-240 MkIII – popular single pass DDP dust monitor for measuring large diameter particulate density (mg/m³) in cement, steel and wood processes.
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