Description
The HI-RES System builds upon the TEOM Series 1105 Diesel Particulate Monitor, and integrates into the data handling and user interfaces of the mass monitoring device. In addition to the dilution tunnel, the HI-RES device is composed of a control unit, valve unit, and pressure control module. The control and valve units are rack mountable, and have their electric and pneumatic connections on their back panels.
The dilution system samples raw exhaust through a multi-hole probe that is directly connected to the dilution tunnel, where the first-stage radial inflow diluter is followed by an ejection diluter. A flow splitter downstream of the ejector diluter provides up to 150 l/min of diluted air through multiple outlets .
Applications
Users can deploy the HI-RES unit for a variety of particle-related measurements of mobile and stationary sources. These include the following:
Mobile sources...
• Sampling of particulate matter from before and after catalyst or diesel particulate filter treatment devices to determine particle removal efficiencies.
• Emissions calibrations for engine mapping and component evaluations.
• Emission test cycles.
• Fuel and lubricant studies.
Stationary sources...
• USEPA Method 5 condensables measurements.
• PM-10 and PM-2.5 USEPA test methods similar to 201A.
• USEPA conditional test method CTM 039 for PM-2.5 stationary sources.
Technology
Sample stream dilution takes place in two stages to maximize the conditioning effect and consistency of the diluted sample stream. To lengthen the mixing duration, a residence chamber can be installed between the second-stage injection diluter and flow splitter, or between the first and second dilution stages.
The dilution ratio set points of the primary and secondary dilution stages are independently selectable by the user.
The first dilution stage employs a radial inflow design, a well accepted dilution geometry whose performance has been validated in aerosol studies. The stage is jacketed, permitting the use of a cooled air or chilled water stream to reduce the sample temperature in high temperature applications.
The second dilution stage is an ejector diluter, in which pressurized air acts as a pump and returns the sample to ambient pressure.
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