REPORT NUMBER: 
ISSUE DATE: 
PAGE: 
FR10430-001 ISSUE 2 
1 June 2023 
12 of 21 
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3.2.2 
Furnace Control 
The percentage deviation of the area of the furnace mean temperature from the standard 
temperature/time curve was within the standard requirements. 
Figure 3 shows the percentage deviation of the mean furnace temperature from the Standard 
curve. 
Figure 3: Percentage Deviation from Standard Curve 
 
3.2.3 
Pressure Measurements 
The differential pressure of the furnace above the laboratory atmosphere was controlled to be 
0 Pa at 500 mm above the notional floor which corresponds to 3.2 Pa at the pressure probe 
in the furnace. The differential pressure was monitored using a micromanometer connected 
to a computer controlled data logging system which recorded the pressure at 15 second 
intervals.  
Figure 4 shows the furnace pressure variation with time. 
 
 
 
 
 
 
-20
-15
-10
-5
0
5
10
15
20
0
20
40
60
80
100
120
140
% 
Time (minutes)
Actual
Allowable

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