Record Display for the EPA National Library Catalog

RECORD NUMBER: 509 OF 680

OLS Field Name OLS Field Data
Main Title Preparation of Truck Version PHS Variable Dilution Sampling System.
Author Springer, Karl J. ; Williams., Glenn L. ;
CORP Author Southwest Research Inst., San Antonio, Tex.;National Center for Air Pollution Control, Ann Arbor, Mich. Procedures and Emissions Background Development Section.
Year Published 1968
Report Number PH-86-67-72; SwRI-11-2056;
Stock Number PB-267 866
Additional Subjects Truck engines ; Exhaust emissions ; Gas sampling ; Numerical analysis ; Design criteria ; Calibrating ; Laboratory equipment ; Performance evaluation ; Dilution ; Concentration(Composition) ; Air pollution sampling ; Procedures
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB-267 866 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 50p
Abstract
One objective of the work efforts under 'A Study of Truck Emissions Powered by Spark Ignited Engines' was to prepare a truck version of the Public Health Service variable dilution exhaust sampling system. This report covers the preparation of this sampling system as well as some limited results using this method as compared with a proportional sampling system. The major change with the truck version was the capability of handling a threefold increase in exhaust and diluent airflow. In preparing this version, other design features were incorporated to improve and broaden the capability of the system. One major feature was the use of a two-speed motor to drive the system blower, providing twice the air handling capability of the automotive prototype. Control features to maintain stable sampling system operation included a powerstat for control of motor and rotary pump speed and continuous temperature record.