[Code of Federal Regulations]
[Title 16, Volume 2]
[Revised as of January 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 16CFR1209.8]

[Page 293-294]
 
                     TITLE 16--COMMERCIAL PRACTICES
 
             CHAPTER II--CONSUMER PRODUCT SAFETY COMMISSION
 
PART 1209--INTERIM SAFETY STANDARD FOR CELLULOSE INSULATION--Table of Contents
 
                         Subpart A--The Standard
 
Sec.  1209.8  Procedure for calibration of radiation instrumentation.

    This procedure is used to calibrate the radiation instruments used 
in the test procedures for measuring critical radiant flux.
    (a) Radition pyrometer. Calibrate the radiation pyrometer by means 
of a conventional black body enclosure placed within a furnace and 
maintained at uniform temperatures of 490, 500, and 510 C 
(914, 932, and 950 F). The black body enclosure may 
consist of a closed chromel metal cylinder with a small sight hole in 
one end. Sight the radiation pyrometer upon the opposite end of the 
cylinder where a thermocouple indicates the black body temperature. 
Place the thermocouple within a drilled hole and in good thermal contact 
with the black body. When the black body enclosure has reached the 
appropriate temperature equilibrium, read the output of the radiation 
pyrometer. Repeat for each temperature.
    (b) Total heat flux meter. The total flux meter shall be calibrated 
by the National Bureau of Standards, (direct request for such 
calibration services to the: Radiometric Physics Division, 534, National 
Bureau of Standards (NBS),

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Washington, DC 20234.), or, alternatively, its calibration shall be 
developed by transfer calibration methods with an NBS calibrated flux 
meter. This latter calibration shall make use of the radiant panel 
tester as the heat source. Measurements shall be made at each of the 
nine dummy specimen positions and the mean value of these results shall 
constitute the final calibration.
    (c) Recommendation. It is recommended that each laboratory maintain 
a dedicated calibrated reference flux meter against which one or more 
working flux meters can be compared as needed. The working flux meters 
should be calibrated according to this procedure at least once per year.