§ 169.3. Definitions.
The following words and terms, when used in this chapter, have the following meanings, unless the context clearly indicates otherwise:
Diesel smoke—Particles, including aerosols, suspended in the engine’s gaseous exhaust stream of the engine which obscure, reflect or refract light.
Full load power—The power produced, at the speed being considered, when the throttle lever is placed in the maximum fuel position.
Idle speed—The low idle speed of the engine as specified by the manufacturer.
Intermediate speed—The peak torque speed or 60% of rated speed, whichever is higher.
Opacity—That fraction of light transmitted from a source which is prevented from reaching the observer or instrument receiver expressed in percent [opacity = 100%(1—transmittance)].
Peak torque speed—The speed at which the engine develops maximum torque as stated by the manufacturer.
Rated brake power—The maximum brake power output of an engine in horsepower (watts) as stated by the manufacturer, in accordance with SAE J270.
Rated speed—The speed at which the manufacturer specifies the rated brake power of an engine.
Resolution—The minimum distinguishable reading, for a given trace width and scale combination, expressed as a percent of full-scale.
Smoke opacimeter—An optical instrument designed to measure the opacity of diesel exhaust gases. The full flow of exhaust gases passes through the optical unit. A smoke opacimeter is described in SAE J255.
Span—The distance between zero and full-scale deflection of the readout device used with the smoke opacimeter.
Vehicular diesel engine—A compression ignition internal combustion engine of less than 1000 horsepower, 745,700 watts, used to propel on land, nonrail, mobile equipment.
Source The provisions of this § 169.3 adopted August 26, 1977, effective August 27, 1977, 7 Pa.B. 2432.
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