[Code of Federal Regulations]
[Title 40, Volume 31]
[Revised as of July 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR1065.284]

[Page 711]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 1065_ENGINE-TESTING PROCEDURES--Table of Contents
 
                    Subpart C_Measurement Instruments
 
Sec.  1065.284  Zirconia (ZrO[bdi2]) analyzer.

    (a) Application. You may use a zirconia (ZrO2) analyzer 
to measure air-to-fuel ratio in raw exhaust for continuous sampling. You 
may use O2 measurements with intake air or fuel flow 
measurements to calculate exhaust flow rate according to Sec.  1065.650.
    (b) Component requirements. We recommend that you use a 
ZrO2 analyzer that meets the specifications in Table 1 of 
Sec.  1065.205. Note that your ZrO2-based system must meet 
the linearity verification in Sec.  1065.307. You may use a Zirconia 
analyzer that has compensation algorithms that are functions of other 
gaseous measurements and the engine's known or assumed fuel properties. 
The target value for any compensation algorithm is 0.0% (that is, no 
bias high and no bias low), regardless of the uncompensated signal's 
bias.

                             PM Measurements