[Code of Federal Regulations]
[Title 40, Volume 18]
[Revised as of July 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR92.115]

[Page 443]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 92--CONTROL OF AIR POLLUTION FROM LOCOMOTIVES AND LOCOMOTIVE ENGINES--
Table of Contents
 
                       Subpart B--Test Procedures
 
Sec. 92.115  Calibrations; frequency and overview.

    (a) Calibrations shall be performed as specified in Secs. 92.116 
through 92.122.
    (b) At least monthly or after any maintenance which could alter 
calibration, perform the periodic calibrations required by 
Sec. 92.118(a)(2) (certain analyzers may require more frequent 
calibration depending on the equipment and use). Exception: the water 
rejection ratio and the CO2 rejection ratio on all NDIR 
analyzers is only required to be performed quarterly.
    (c) At least monthly or after any maintenance which could alter 
calibration, calibrate the engine dynamometer flywheel torque and speed 
measurement transducers, as specified in Sec. 92.116.
    (d) At least monthly or after any maintenance which could alter 
calibration, check the oxides of nitrogen converter efficiency, as 
specified in Sec. 92.121.
    (e) At least weekly or after any maintenance which could alter 
calibration, check the dynamometer (if used) shaft torque feedback 
signal at steady-state conditions by comparing:
    (1) Shaft torque feedback to dynamometer beam load; or
    (2) By comparing in-line torque to armature current; or
    (3) By checking the in-line torque meter with a dead weight per 
Sec. 92.116(b)(1).
    (f) At least quarterly or after any maintenance which could alter 
calibration, calibrate the fuel flow measurement system as specified in 
Sec. 92.107.
    (g) At least annually or after any maintenance which could alter 
calibration, calibrate the electrical output measurement system for the 
electrical load bank used for locomotive testing.
    (h) Sample conditioning columns, if used in the CO analyzer train, 
should be checked at a frequency consistent with observed column life or 
when the indicator of the column packing begins to show deterioration.
    (i) For equipment not addressed in Secs. 92.116 through 92.122 
calibrations shall be performed at least as often as required by the 
equipment manufacturer or as necessary according to good practices. The 
calibrations shall be performed in accordance with procedures specified 
by the equipment manufacturer.
    (j) Where testing is conducted intermittently, calibrations are not 
required during period in which no testing is conducted, provided that 
times between the most recent calibrations and the date of any test does 
not exceed the calibration period. For example, if it has been more than 
one month since the analyzers have been calibrated (as specified in 
paragraph (c) of this section) then they must be calibrated prior to the 
start of testing.