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General-purpose dilution and sampling system
for bag mass emissions and particulate analysis.
Modular components - mixing tee, tunnel, exhaust
sampler, bag sampler, particulate sampler, and
control unit - provide flexibility to support:
configurations for all engine sizes, applications,
and fuels - from mopeds to mini-buses, small
utility to heavy-duty engines, SULEV to higher-
emission vehicles. Includes configurations for
gasoline, diesel, and alternative--fuels; wide
range of flow rates - from 1 m3/min (35 SCFM)
to 180 m3/min (6400 SCFM) depending
on engine size and application; single, selectable,
or scalable flow rates (choice of critical-flow-venturi
technique (CFV) or subsonic - venturi technique
(SAO) assures flexibility in flow rate control
and measurement); advanced bag sampling techniques
(supports up to 12 bags or as few as 4; enhanced
systems offer variety of techniques to prevent
water condensation, minimize HC out-gassing,
reduce HC hang-up, and lower dilution ratio;
dedicated lines and bags allow separation of
gasoline and diesel samples - or separation
of "clean" and "dirty"
samples for ULEV/SULEV testing); basic and enhanced
dilution strategies (basic mixing tees and tunnels
accommodate routine exhaust-dilution requirements;
enhanced systems offer a variety of techniques
to prevent water condensation, purify dilution
air, control tailpipe pressure, and improve
resolution of CVS measurements); direct measurement
of dilution air volume (installed in the mixing
tee, an SAO can measure dilution- air volume
to allow calculation of tailpipe volume for
modal tests); installation in test cells with
limited space (modular design allows installation
where space is available - in the test cell,
in the control room, and/or on a mezzanine);
the Main Control Unit - also used by the MEXA-7000
analytical system - provides comprehensive data
displays, alarms, calibration/QC functions,
and data logging.
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