LDV on RDE road test

Gaseous and Exhaust Flow Measurement

SEMTECH® DS+ for heavy-duty


The SEMTECH® DS+ is a modular Portable Emissions Measurement System (PEMS) for Heavy-Duty In-Use Testing (HDIUT). The base system is comprised of a Sample Conditioning System (or SCS), a Gas Analyzer (or GAS), and an Exhaust Flow Meter (or EFM). The EFM accommodates the full range of easily interchangeable flow tube diameters, enabling use on a wide range of engine sizes with a single system.

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