[Code of Federal Regulations]

[Title 40, Volume 31]

[Revised as of July 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 40CFR1065.201]



[Page 699]

 

                   TITLE 40--PROTECTION OF ENVIRONMENT

 

         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)

 

PART 1065_ENGINE-TESTING PROCEDURES--Table of Contents

 

                    Subpart C_Measurement Instruments

 

Sec.  1065.201  Overview and general provisions.





    (a) Scope. This subpart specifies measurement instruments and 

associated system requirements related to emission testing in a 

laboratory and in the field. This includes laboratory instruments and 

portable emission measurement systems (PEMS) for measuring engine 

parameters, ambient conditions, flow-related parameters, and emission 

concentrations.

    (b) Instrument types. You may use any of the specified instruments 

as described in this subpart to perform emission tests. If you want to 

use one of these instruments in a way that is not specified in this 

subpart, or if you want to use a different instrument, you must first 

get us to approve your alternate procedure under Sec.  1065.10. Where we 

specify more than one instrument for a particular measurement, we may 

identify which instrument serves as the reference for showing that an 

alternative procedure is equivalent to the specified procedure.

    (c) Measurement systems. Assemble a system of measurement 

instruments that allows you to show that your engines comply with the 

applicable emission standards, using good engineering judgment. When 

selecting instruments, consider how conditions such as vibration, 

temperature, pressure, humidity, viscosity, specific heat, and exhaust 

composition (including trace concentrations) may affect instrument 

compatibility and performance.

    (d) Redundant systems. For all measurement instruments described in 

this subpart, you may use data from multiple instruments to calculate 

test results for a single test. If you use redundant systems, use good 

engineering judgment to use multiple measured values in calculations or 

to disregard individual measurements. Note that you must keep your 

results from all measurements, as described in Sec.  1065.25. This 

requirements applies whether or not you actually use the measurements in 

your calculations.

    (e) Range. You may use an instrument's response above 100% of its 

operating range if this does not affect your ability to show that your 

engines comply with the applicable emission standards. Note that we 

require additional testing and reporting if an analyzer responds above 

100% of its range. See Sec.  1065.550. Auto-ranging analyzers do not 

require additional testing or reporting.

    (f) Related subparts for laboratory testing. Subpart D of this part 

describes how to evaluate the performance of the measurement instruments 

in this subpart. In general, if an instrument is specified in a specific 

section of this subpart, its calibration and verifications are typically 

specified in a similarly numbered section in subpart D of this part. For 

example, Sec.  1065.290 gives instrument specifications for PM balances 

and Sec.  1065.390 describes the corresponding calibrations and 

verifications. Note that some instruments also have other requirements 

in other sections of subpart D of this part. Subpart B of this part 

identifies specifications for other types of equipment, and subpart H of 

this part specifies engine fluids and analytical gases.

    (g) Field testing and testing with PEMS. Subpart J of this part 

describes how to use these and other measurement instruments for field 

testing and other PEMS testing.