SEMTECH® EFM-HS
This high-speed exhaust flowmeter samples the four differential pressure transducers at up to 2500 Hz, accurately capturing every forward and reverse flow pulsation from idle to maximum flow rate. Embedded calibration coefficients are recognized at installation, for plug-and-play capabilities, enabling the use of multiple tubes on a single control module.
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A proprietary algorithm computes a spline fit of the differential pressure signals, and calculates a running square-root average that is used to determine output flow rates at 5 Hz (500 Hz with the high speed option). The high-speed sampling and symmetrical design of the averaging pitot tube provides the EFM-HS with the ability to accurately measure reverse flow due to engine pulsations, and to properly account for this phenomenon in the average flow rate determination.
Available Tube Sizes and Flow Rates
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