SEMTECH® EFM-HS
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SEMTECH® EFM-HS High Speed Exhaust Flow Meter Sensors’ High Speed Exhaust Flow Meter, the SEMTECH EFM-HS, adds exciti ng capabiliti es and features to the product line. With a sampling rate of up to 2500 Hz and four, dual stage diff erenti al pressure transducers, the EFM-HS accurately measures every forward and reverse fl ow pulsati on from idle to maximum fl ow rate, and properly accounts for these pulsati ons in the exhaust fl ow determinati on. This is a tremendous advantage over low speed exhaust fl owmeters which are suscepti ble to measurement error from high frequency pulsati ons. The EFM-HS also off ers a long list of other performance enhancements and convenience features that set it apart from the competi ti on. Mass fl ow rate accuracy and linearity of the SEMTECH EFM-HS exceeds the US and European performance standards over a 50:1 turndown rati o. The EFM-HS can be used to measure exhaust fl ow rate from both spark and compression igniti on engines, as a stand-alone device, or in conjuncti on with the emissions measurements of the SEMTECH-DS or other gas analyzers, to compute real-ti me mass emissions. Emissions Measurement Solutions

2 SEMTECH EFM-HS High Speed Exhaust Flow Meter Opti onal Confi gurati ons High Speed Data Acquisiti on: Data output rate of 500 Hz is available. Stand-Alone Confi gurati on: SENSOR Tech-EFMHS applicati on enables system operati on from a Windows environment. Dual Channel Confi gurati on: A second channel with a full set of transducers can be added to the system in the same electronics module. This is useful for measuring a dual exhaust system, exhaust and EGR simultaneous measurement, or detecti ng undeveloped fl ow conditi ons. Customized Interface: Sensors can develop a customized device...

3 SEMTECH EFM-HS High Speed Exhaust Flow Meter The Technology Operati ng under the Bernoulli principle, the SEMTECH EFM-HS uses four high performance, dual-stage, diff erenti al pressure transducers, sampling conti nuously at up to 2500 Hz, measuring every pressure pulse from an engine. The sensors are housed in a heated manifold, eliminati ng thermal drift . The eight combined diff erenti al pressure ranges span nearly fi ve orders of magnitude, allowing accurate measurements over a wide range of fl ow rates. The smallest transducer range is 0.025 kPa with a resoluti on of 5x10-5 kPa,...

Sensors, Inc. • 6812 State Rd. • Saline, Michigan 48176 • PH:(734) 429-2100 • FX:(734) 429-4080 • www.sensors-inc.com Sensors Europe GmbH • Feldheider Str. 60 • 40699 Erkrath • Germany • PH: +49 (0) 2104-14188-0 • FX: +49 (0) 2104-14188-14 SEMTECH EFM-HS Available Sizes and Flow Rates Recommended Application: Engine Size (L) & Type Gas Diesel < 1 † < 0.8 < 2 † < 1.5 < 2 < 1.5 2 - 5 1.5 - 4 > 5 4 - 6 - 6 - 12 - 12 - 18 - > 18 Flow Tube Outer Diameter in mm 1 25 1.5 38 2 51 2.5 64 3 76 4 102 5 127 6 152 Flow Tube Length (Length including extension) in mm 20 (26) 508 (660) 20 (26) 508 (660) 20...