FSZ 2373  | page  9 of 38 
 
4 
Equipment 
4.1 
Furnace 
The furnace had a nominal opening of 3000-mm x 3000-mm for the attachment of vertical 
specimens. 
The furnace was lined with refractory bricks and materials with the thermal properties as specified 
in AS 1530.4-2014 and was heated by combustion of a mixture of natural gas and air. 
4.2 
Temperature 
The temperature in the furnace chamber was measured by eight type K, 3-mm diameter,  
and 310 stainless steel Mineral Insulated Metal Sheathed (MIMS) thermocouples. Each 
thermocouple was housed in high-nickel steel tubes opened at the exposed end. 
Locations of the thermocouples on the unexposed face of the specimen are described in 
Appendix A. 
4.3 
Radiant heat source 
The radiant heat source consisted of a 3-mm thick stainless-steel sheet mounted into a refractory 
frame in two sections with a vertical joint at its centre. The frame housing the steel sheet was 
positioned and sealed up against the front of the furnace aperture. 
4.4 
Radiant heat flux calibration 
Prior to the test, the positions of the specimen (relative to the radiant heat source) were established 
that corresponded to the required radiant heat flux levels. 
Radiation distribution was also established by measuring radiant heat flux levels at the centre and 
the centre of each quarter section of the specimen in a plane approximating the intended position 
of the specimen such that the central value will be approximately equal to the rest of the radiant 
heat flux. 
4.5 
Measurement system 
The primary measurement system comprised multiple-channel data loggers, scanning at five 
second intervals during the test. 
 
5 
Ambient temperature 
The temperature of the test area was 21°C at the commencement of the test. 
 
 
 

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