[Code of Federal Regulations]
[Title 40, Volume 30]
[Revised as of July 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR1065.610]

[Page 672]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 1065_TEST PROCEDURES AND EQUIPMENT--Table of Contents
 
                Subpart G_Data Analysis and Calculations
 
Sec. 1065.610  Bag sample analysis.

    (a) Zero the analyzers and obtain a stable zero reading. Recheck 
after tests.
    (b) Introduce span gases and set instrument gains. To avoid errors, 
span and calibrate at the same flow rates used to analyze the test 
sample. Span gases should have concentrations equal to 75 to 100 percent 
of full scale. If gain has shifted significantly on the analyzers, check 
the calibrations. Show actual concentrations on the chart.
    (c) Check zeroes; if necessary, repeat the procedure in paragraphs 
(a) and (b) of this section.
    (d) Check flow rates and pressures.
    (e) Measure HC, CO, CO2, and NOX 
concentrations of samples.
    (f) Check zero and span points. If the difference is greater than 2 
percent of full scale, repeat the procedure in paragraphs (a) through 
(e) of this section.