Pennsylvania Code
Title 67 - TRANSPORTATION
Part I - Department of Transportation
Subpart A - Vehicle Code Provisions
Article VII - Vehicle Characteristics
Chapter 169 - DIESEL SMOKE MEASUREMENT PROCEDURE
Section 169.8 - Instrument checks
Universal Citation: 67 PA Code ยง 169.8
Current through Register Vol. 54, No. 44, November 2, 2024
(a) Smoke opacimeter. The smoke opacimeter shall be checked according to the following procedure prior to each test:
(1) Check the surfaces of the optical section
to verify that they are clean and free from foreign material and
fingerprints.
(2) Adjust the zero
control under conditions of "no smoke" to give a recorder trace of
zero.
(3) Use calibrated neutral
density filters having approximately 10%, 20% and 40% opacity to check the
linearity of the instrument. Deviations in excess of 1% of the calibrated value
of a filter should be corrected.
(i) Insert
the filter in the light path perpendicular to the axis of the beam and adjacent
to the opening from which the beam of light from the light source emanates and
note the recorder response.
(ii)
For maximum correlation of results, the calibration of the neutral density
filters should be traceable to the United States National Bureau of
Standards.
(b) Other instruments. The instruments for measuring engine speed, torque, air inlet restrictions, exhaust system back pressure, fuel rate and so forth, and for recording engine speed and smoke opacity used in the tests prescribed herein shall be calibrated periodically in accordance with good technical practice.
This section cited in 67 Pa. Code § 169.4 (relating to smoke emission test).
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