Abstract
Three types of foam concentration measurement techniques are examined: total fluorine content, optical absorption, and specific conductivity. Specific conductivity was found to be the most useful for field measurements and was therefore compared with the traditional refractive index approach. It was found that electrical conductance provides a more accurate method of estimating the concentration of AFFF solution than does the refractive index technique described in NFPA 11.
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Timms, G., Haggar, P. Foam concentration measurement techniques. Fire Technol 26, 41–50 (1990). https://doi.org/10.1007/BF01040189
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DOI: https://doi.org/10.1007/BF01040189