[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: 40CFR1065.290]



[Page 710]

 

                   TITLE 40--PROTECTION OF ENVIRONMENT

 

         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)

 

PART 1065_ENGINE-TESTING PROCEDURES--Table of Contents

 

                    Subpart C_Measurement Instruments

 

Sec.  1065.290  PM gravimetric balance.



    (a) Application. Use a balance to weigh net PM on a sample medium 

for laboratory testing.

    (b) Component requirements. We recommend that you use a balance that 

meets the specifications in Table 1 of Sec.  1065.205. Note that your 

balance-based system must meet the linearity verification in Sec.  

1065.307. If the balance uses internal calibration weights for routine 

spanning and linearity verifications, the calibration weights must meet 

the specifications in Sec.  1065.790. While you may also use an inertial 

balance to measure PM, as described in Sec.  1065.295, use a reference 

procedure based on a gravimetric balance for comparison with any 

proposed alternate measurement procedure under Sec.  1065.10.

    (c) Pan design. We recommend that you use a balance pan designed to 

minimize corner loading of the balance, as follows:

    (1) Use a pan that centers the PM sample on the weighing pan. For 

example, use a pan in the shape of a cross that has upswept tips that 

center the PM sample media on the pan.

    (2) Use a pan that positions the PM sample as low as possible.

    (d) Balance configuration. Configure the balance for optimum 

settling time and stability at your location.