[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: 40CFR1065.315]



[Page 720]

 

                   TITLE 40--PROTECTION OF ENVIRONMENT

 

         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)

 

PART 1065_ENGINE-TESTING PROCEDURES--Table of Contents

 

                Subpart D_Calibrations and Verifications

 

Sec.  1065.315  Pressure, temperature, and dewpoint calibration.



    (a) Calibrate instruments for measuring pressure, temperature, and 

dewpoint upon initial installation. Follow the instrument manufacturer's 

instructions and use good engineering judgment to repeat the 

calibration, as follows:

    (1) Pressure. We recommend temperature-compensated, digital-

pneumatic, or deadweight pressure calibrators, with data-logging 

capabilities to minimize transcription errors. We recommend using 

calibration reference quantities that are NIST-traceable within 0.5% 

uncertainty.

    (2) Temperature. We recommend digital dry-block or stirred-liquid 

temperature calibrators, with datalogging capabilities to minimize 

transcription errors. We recommend using calibration reference 

quantities that are NIST-traceable within 0.5% uncertainty.

    (3) Dewpoint. We recommend a minimum of three different temperature-

equilibrated and temperature-monitored calibration salt solutions in 

containers that seal completely around the dewpoint sensor. We recommend 

using calibration reference quantities that are NIST-traceable within 

0.5% uncertainty.

    (b) You may remove system components for off-site calibration. We 

recommend specifying calibration reference quantities that are NIST-

traceable within 0.5% uncertainty.



                        Flow-Related Measurements