|In many fire test methods the radiation level is specified and therefore, it is of great importance that the radiant heat flux is well defined and measured with sufficient accuracy. Radiant heat transfer is also the dominant mode of heat transfer in most real fires.
Tests of resistance to fire, representing fully developed fires, use heat flux gauges to measure the heat radiating from the tested object. In reaction to fire testing the heat flux meters are used to characterise the thermal load to the test specimen.
Therefore the heat flux measurement is a crucial part of product quality assessment and enhancement, and must be performed accurately and according to metrological rules.
A European project have been run under the auspices of SMT4 to improve heat flux meter calibration and to establish a well-defined calibration chain and to standardise the use the HFM in fire tests. LNE, SP, TNO and VTT participated in the project.
European primary calibration facilities are now available in France and Sweden (LNE, SP). These means contribute to a well-defined secondary calibration facility for use at each of the laboratories where heat flux meters are used on a daily basis. Guidelines for fire testing laboratory users and Input for standardisation are available.
Full results are found in NT tec 527 / TR 527
Improving heat fluxmeter calibration for fire testing laboratories (HFCAL). Further information about primary calibration of heat flux meters is given here.