434 

14 CFR Ch. I (1–1–19 Edition) 

Pt. 25, App. F 

(ii) 

Calorimeter. 

The calorimeter must be a 

total heat flux, foil type Gardon Gage of an 
appropriate range such as 0–20 Btu/ft

2

-sec (0– 

22.7 W/cm

2

), accurate to 

±

3% of the indicated 

reading. The heat flux calibration method 
must be in accordance with paragraph 
VI(b)(7) of this appendix. 

(iii) 

Calorimeter mounting. 

Mount the calo-

rimeter in a 6- by 12- 

±

0.125 inch (152- by 305- 

±

3 mm) by 0.75 

±

0.125 inch (19 mm 

±

3 mm) 

thick insulating block which is attached to 
the heat flux calibration rig during calibra-
tion (figure 4). Monitor the insulating block 
for deterioration and replace it when nec-
essary. Adjust the mounting as necessary to 
ensure that the calorimeter face is parallel 
to the exit plane of the test burner cone. 

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