The MicroSEM Model AE91 Source Emissions Monitor offers a compact, very fast method to sample and analyze hot, moist exhaust streams for elemental or “black” carbon (BC) particles. The instrument is designed to provide fast, accurate measurements of BC while packaged in a rugged, portable confi guration that is easy to operate and maintain.
The instrument can be used to routinely measure BC emissions from exhaust sources such as:
• Diesel engine exhaust
• Gasoline engine exhaust “high emitters”
• Wood fi red boiler exhaust
• Small, medium and large stationary source exhausts, and other combustion exhaust streams where fast, representative measurement of BC is desired.
Combustion aerosols generated by automotive and other combustion processes typically have a wide rangeof operating characteristics. Exhaust gas temperature, humidity, velocity and particle concentration can change significantly during normal operations of the engine or source which, in turn, can affect size distribution and chemistry. Although volatile components of the exhaust are far from equilibrium, BC is unaff ected by temperature, humidity, or other attributes of raw exhaust. Thus, an exhaust sample is representative of BC present in the exhaust stream.The measurement is a single snapshot of the concentration of BC in the exhaust, yielding an integrated measurement over the sampling period and is intended for spot emissions tests at roadside, for identification of “high emitting” vehicles and verifi cation of proper DPM control system operation.
The system creates a permanent BC deposit of the filter ticket spot, which will not evaporate nor change over time. If the filter tickets are uniquely numbered, this spot becomes part of the permanent record of the test. The test report generated by the instrument includes all pertinent test identifi cation information and test results are formatted in standard ASCII text that can be read by a wide variety of word processing or spreadsheet software
including those included in Microsoft Office products.
Important features
• Low maintenance and consumable requirements.
• Direct measurment method – real-time sample collection and analysis of Aerosol Black Carbon mass concentration
• Optical source – 880 nm wavelength(IR) LED - Aethalometer Method
• Wide dynamic range - capable of measuring BC concentrations from controlled to uncontrolled emission sources. For example, the instrument is capable of measuring carbonaceous aerosols emitted from a DPF-controlled diesel engine while also being able to measure emissions from raw, untreated exhaust.
