EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of EN ISO 14934-3 testing. This part of EN ISO 14934 specifies methods for calibrating heat flux meters for use in fire testing. The methods only apply to instruments with aircraft receivers. Wire, globe etc. They do not apply to recipients.
Many fire testing methods specify the radiation level and therefore it is of great importance that the radiant heat flux be well defined and measured with sufficient accuracy. Radiant heat transfer is also the dominant mode of heat transfer in most real fires.
A series of fire tests described in International Standards published by ISO require test specimens to be exposed to specified radiation levels. It is therefore necessary for fire testing laboratories to be able to maintain standard heat flux meters in working order to measure radiance.
This part of EN ISO 14934 describes methods for calibrating heat flow meters used as operating standards in fire testing and for measuring heat flow in fire testing. Two different approaches can be used, either by calibration in one of the primary calibration apparatus or by transfer calibration. Transfer calibration is performed by comparing the heat flux meter with a known precision heat flux meter, referred to as the secondary standard. Second, it will be calibrated according to EN ISO 14934-2.
Calibrating heat flow meters for use as primary and secondary standards requires significant expertise and equipment not covered in this part of EN ISO 14934. Reference is also made to radiation, EN ISO 14934-1 and EN ISO 14934-2 for information on the calibration of primary standards and a detailed explanation of the principles of thermal measurement.
Transfer calibration of heat flux meters (total hemispherical radiometers and total heat flux meters) for use as working standards is performed by comparing the response of the heat flux meter at various irradiance levels with the response of a secondary standard heat flux meter of the same type.
Measurements are made at different radiation levels, obtained by varying the distance between the radiation source and the heat flux meter or by varying the temperature of the radiation source. Transfer calibration is performed at a minimum of 10 different radiation levels. The secondary standard heat flow meter is calibrated according to one of the primary methods described in EN ISO 14934-2.
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