New FM certificate for improved viscosity values of foam proportioners
Recently, the FireDos foam proportioners with high-viscosity foam concentrates were again subjected to FM tests – with convincing results: The optimized proportioning systems can convey high-viscosity foam concentrates even better than the previous models and thus achieve FM-approved viscosity values for so-called “Variable Viscosity Proportioners” that are unique on the market.
A variable viscosity foam proportioner is a device designed to accurately mix foam concentrate with water, for any viscosity that is below the tested values. In practical terms, this means that the proportioner can handle both low-viscosity (Newtonian) and high-viscosity (pseudoplastic) foam agents, independent of flow rates and back pressure to ensure a consistent and effective premix.

New FM certificate for improved viscosity values of FireDos proportioning systems
Admixing high-viscosity foam agents
According to the latest FM test results, the viscosity values of FireDos foam proportioners not only significantly exceed those of previous models, but also those of FM-certified competitor products. On average, the certified viscosity is 12% higher. (as of December 2024)
Low pressure loss with a large operating range
When using high-viscosity foam concentrates, the pressure loss of a proportioning system is significantly higher than with low-viscosity foam agents. This makes it all the more remarkable that, according to the FM test results, FireDos proportioners only have a low pressure loss at maximum extinguishing water flow. Compared to FM-approved competitor products, the pressure loss is up to 50 % lower with a 1.5-fold operating range.
FM-certified flow meter as a useful accessory
The electromagnetic flow meter for measuring the foam agent volume flow is also FM-certified. Installed on the return line, it reliably measures the extinguishing agent flow and enables the proportioning rate to be determined. According to FM, a general estimate of the extinguishing water volume flow in the range of 20 % to 100 % of the maximum flow rate can be made with the optional, calibrated tachometer.
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