下载次数：191次 浏览次数：960次发布时间：2015-11-16 16:45TSI Rotating Disk Thermodiluter is highly regarded in the field
of particle emission measurement. It is especially suited for
sampling, diluting, and conditioning exhaust particles from
diesel- and spark-ignition engines, as well as performing stack
emission studies. The Model 379020A features a separate diluter
head and control unit that effectively dilutes the sample at the
source (tailpipe, CVS tunnel, or stack) in order to preserve it for
accurate measurement. Additional features of the rotating
disk diluter include:
+ Adjustable dilution ratio with no tools or recalibration required
+ Accurate dilution over two full decades
+ Built-in heater with selectable temperatures to avoid measurement
of condensed volatile materials
+ Rotating disk that is easy to clean and maintain
+ Robust disk coatings to reduce wear and improve lifetime
+ Replaceable disks now available for added convenience and to
reduced maintenance downtime
+ Improved design to simplify operation and to increase durability
a sample for measurement. Each unit is supplied with two disks:
one with eight cavities and the other with ten cavities. This allows
you to select a dilution ratio from 15:1 to 3000:1. As shown in Figure
1, the raw, undiluted exhaust emissions are sampled at a rate of
approximately 1.0 L/min. A portion of the raw exhaust is captured by
each cavity of the rotating disk and transported to the measurement
channel where it is mixed with HEPA-filtered, particle-free dilution
air. The dilution ratio is a linear function of the disk calibration factor
(corresponding cavity volume and number of cavities per disk), the
rotation frequency and the flow rate of the dilution air:
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