[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: 40CFR92.105]

[Page 423-424]
 
                   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. 92.105  General equipment specifications.

    (a) Chart recorders. (1) The recommended minimum chart speed for 
gaseous measurements is 1 cm per minute. (Higher chart speeds are 
required for smoke measurements during the acceleration phases of the 
test sequence.)
    (2) All chart recorders (analyzers, torque, rpm, etc.) shall be 
provided with automatic markers which indicate ten second intervals. 
Preprinted chart paper (ten second intervals) may be used in lieu of the 
automatic markers provided the correct chart speed is used. (Markers 
which indicate 1 second intervals are required for smoke measurements 
during the acceleration phases of the test sequence.)
    (b) Automatic data collection. (1) In lieu of the use of chart 
recorders, automatic data collection equipment may be used to record all 
required data. The automatic data collection equipment must be capable 
of sampling at least two records per second.
    (2) Other means may be used provided they produce a permanent visual 
data record of a quality equal to or better than those required by this 
subpart (e.g., tabulated data, traces, or plots).
    (c) Temperature measurements. (1) The following temperature 
measurements shall be accurate to within 1.0  deg.F (0.6  deg.C):
    (i) Temperature measurements used in calculating the engine intake 
humidity;
    (ii) The temperature of the fuel, in volume measuring flow rate 
devices;
    (iii) The temperature of the sample within the water trap(s);
    (iv) Temperature measurements used to correct gas volumes (e.g., to 
standard conditions) or to calculate mass or moles of a sample.
    (2) All other temperature measurements shall be accurate within 3.0 
deg.F (1.7  deg.C).
    (d) Electrical measurements. (1) Voltmeters shall have accuracy and 
precision of 1 percent of point or better.
    (2) Ammeters shall have accuracy and precision of 1 percent of point 
or better.
    (3) Wattmeters shall have accuracy and precision of 1 percent of 
point or better.
    (4) Instruments used in combination to measure engine power output 
shall comply with the requirements of Sec. 92.106.
    (e) Pressure measurements. (1) Gauges and transducers used to 
measure any pressures used to correct gas volumes

[[Page 424]]

(e.g., to standard conditions) or to calculate mass or moles of a sample 
shall have an accuracy and precision of 0.1 percent of absolute pressure 
at point or better.
    (2) Gauges and transducers used to measure any other pressures shall 
have an accuracy and precision of 1 percent of absolute pressure at 
point or better.