SEMTECH®
EFM-HS
High Speed Exhaust Flow Meter
Sensors’ High Speed Exhaust Flow Meter, the SEMTECH EFM-HS, adds
exciting ca...
2
SEMTECH EFM-HS
High Speed Exhaust Flow Meter
Optional Configurations
High Speed Data Acquisition: Data output rate of 500...
3
SEMTECH EFM-HS
High Speed Exhaust Flow Meter
The Technology
Operating under the Bernoulli principle, the
SEMTECH EFM-HS ...
Sensors, Inc. • 6812 State Rd. • Saline, Michigan 48176 • PH:(734) 429-2100 • FX:(734) 429-4080 • www.sensors-inc.com
Sens...
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Semtech Efm Hs High Speed Flow Tube

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Sensors High Speed (2,500Hz)Exhaust Flow Meter

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Semtech Efm Hs High Speed Flow Tube

  1. 1. SEMTECH® EFM-HS High Speed Exhaust Flow Meter Sensors’ High Speed Exhaust Flow Meter, the SEMTECH EFM-HS, adds exciting capabilities and features to the product line. With a sampling rate of up to 2500 Hz and four, dual stage differential pressure transducers, the EFM-HS accurately measures every forward and reverse flow pulsation from idle to maximum flow rate, and properly accounts for these pulsations in the exhaust flow determination. This is a tremendous advantage over low speed exhaust flowmeters which are susceptible to measurement error from high frequency pulsations. The EFM-HS also offers a long list of other performance enhancements and convenience features that set it apart from the competition. Mass flow rate accuracy and linearity of the SEMTECH EFM-HS exceeds the US and European performance standards over a 50:1 turndown ratio. The EFM-HS can be used to measure exhaust flow rate from both spark and compression ignition engines, as a stand-alone device, or in conjunction with the emissions measurements of the SEMTECH-DS or other gas analyzers, to compute real-time mass emissions. Emissions Measurement Solutions
  2. 2. 2 SEMTECH EFM-HS High Speed Exhaust Flow Meter Optional Configurations High Speed Data Acquisition: Data output rate of 500 Hz is available. Stand-AloneConfiguration:SENSORTech-EFMHS application enables system operation from a Windows environment. Dual Channel Configuration: 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 detecting undeveloped flow conditions. Customized Interface: Sensors can develop a customized device driver to interface with various host systems. System Features and Benefits High Speed Sampling: The EFM-HS internally samples the differential pressure channels at up to 2500 Hz, accounting for every pressure pulse from an engine, from idle to maximum rpm. Standard output rate is 5 Hz. Embedded Calibration: Calibration coefficients embedded in the flow tube electronics are automatically recognized on connection, enabling multiple tubes to be used with one control module. Multiple Tube Sizes: Eight flow tube sizes accommodate engines from less than 0.8L displacement up to 24L. Back Purge: A software controlled back purge pump is included in the flow tube assembly along with solenoids that route high pressure air backward through the pitot tube, purging contaminants and any condensation in the pressure lines. No dismantling is required. Auto Zero: With a single software command, internal solenoids open the pressure sensors to ambient air, allowing fast and easy zeroing while the engine is still operating. Weatherproof Construction: The unit can be used off-road and in other harsh environments. All components are weatherproof to IP54 (NEMA 3) standards. Heated Components: The averaging pitot tube and pressure lines are heated at the flow tube assembly in order to prevent condensation and freezing in cold weather. The differential pressure sensors are housed in a temperature controlled manifold in the control module for added stability. Sample Screen from SENSOR Tech-EFMHS
  3. 3. 3 SEMTECH EFM-HS High Speed Exhaust Flow Meter The Technology Operating under the Bernoulli principle, the SEMTECH EFM-HS uses four high performance, dual-stage, differential pressure transducers, sampling continuously at up to 2500 Hz, measuring every pressure pulse from an engine. The sensors are housed in a heated manifold, eliminating thermal drift. The eight combined differentialpressurerangesspannearlyfiveorders of magnitude, allowing accurate measurements over a wide range of flow rates. The smallest transducer range is 0.025 kPa with a resolution of 5x10-5 kPa, while the highest range is 16.5 kPa. A proprietary algorithm computes a spline fit of the eight high speed 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.
  4. 4. 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 (26) 508 (660) 25 (32.5) 635 (825) 25 (34) 635 (864) 25 (37) 635 (940) 30 (45) 762 (1143) 36 (54) 914 (1372) Backpressure Flow rate at 200°C, SCFM (m3 /min) 10” H2 0 2.5 kPa 67 (1.9) 109 (3.1) 175 (4.9) 425 (12.0) 600 (17.0) 1100 (31.2) 1700 (48.1) 2380 (67.3) 15” H2 0 3.75 kPa 83 (2.4) 146 (4.1) 215 (6.1) 550 (15.6) 775 (22.0) 1350 (38.2) 2100 (59.5) 2940 (83.3) Backpressure Flow rate at 400°C, SCFM (m3 /min) 10” H2 O 2.5 kPa 56 (1.6) 91 (2.6) 147 (4.2) 356 (10.0) 503 (14.3) 922 (26.2) 1425 (40.3) 1995 (56.4) 15” H2 O 3.75 kPa 69.6 (2.0) 122 (3.5) 180 (5.1) 461 (13.1) 649 (18.4) 1132 (32.0) 1760 (49.9) 2465 (69.8) † Non-Turbo NOTE: Specifications are subject to change without no- tice. While due caution has been exercised in the produc- tion of this document, possible errors and omissions can occur. R 05/10 4 SEMTECH EFM-HS High Speed Exhaust Flow Meter Exhaust temperature range: -5 to 700°C standard construction (higher temperature capability available upon request) Exhaust temperature accuracy: ± 1% of reading or ± 2°C, whichever is greater Flow measurement linearity: < 1.0% of full scale Exceeds 1065 Subpart D and ISO 16183 standards Flow measurement accuracy: ± 2% of reading or ± 0.5% of full scale, whichever is greater Warm up time: < 5 minutes at 20°C ambient System response time: < 2 ms Data rate: 5 Hz standard High Speed option data rate: 500 Hz (100 Hz display rate) Resolution: 0.1 SCFM Power requirements: 12VDC , 30W; 110VAC Communications: RS 232 Control module dimensions: 36cm x 18cm x 10cm (LxDxW) Control module weight: 4kg (9 lbs) Length* Diameter* 69.0mm 381.0mm 49.0mm *see chart above. NOTE: Accurate measurments require adequate straight pipe length prior to the exhaust entering the measuring pitot. This is ensured with our tube extension kits, refer- enced in the length specifications in the chart above.

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