Back in 2018 NATO adopted a new Fast Heating test standard (AOP4240) which introduces an alternative procedure that utilises a gas-fuelled heating source. The standard requires a minimum net absorbed heat flux of 80 kW/m² to be demonstrated. The IMEMG FCO expert working group have worked on the definition of a simple calibration tool (CALIFLUX) to demonstrate the net absorbed heat flux. The device works as a thermal capacitance and consists of a small steel cylinder with known physical properties, equipped with a thermocouple.

CALIFLUX data

The device description is provided on the IMEMG website.

CALIFLUX_notice_v2.1	Design characteristics (CAD file, material properties), notice of use and post-processing formula
CALI phi25 v2.2.xlsm	Post processing file example
EMTWG’ 2024 paper	Calibration results (laboratory experiments, real kerosene fire trials, uncertainties, material choice rational and Curie point discussion
EMTWG’ 2024 presentation	Heat flux measurements with CALIFLUX in fast heating tests – Presentation

Any company or test centre may use this information for its own use. The IMEMG declines any responsibility for the function or results obtained when using the tool.

Procurement

IMEMG member companies: Within the limits of available stocks, the basic CALIFLUX components can be supplied free of charge by IMEMG. Non-member entities*: The basic CALIFLUX components can be purchased from any external supplier provided that the design and material specifications are met. IMEMG accepts no liability for the function of the components or the assembled CALIFLUX sensor.

For more information, please contact IMEMG: imemg@imemg.org

*Non-member companies should contact IMEMG at imemg@imemg.org