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  • Specification

SEMTECH EFM-HS: High Speed Exhaust Flow Meter

  • 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.

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Sensors’ High Speed Exhaust Flow Meter, the SEMTECH EFM-HS, replaces our EFM 2 and adds exciting capabilities and features to the product line. With a sampling rate of up to 2500 Hz and four 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.


Exhaust temperature range: -5°C to700°C standard, higher temp 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; 500 Hz with High Speed Option (100 Hz display rate)
Resolution: 0.1 SCFM
Power requirement: 12 VDC, 30 W; 110VAC
Communications: RS232
Control module dimensions: 36cm x 18cm x 10cm (LxDxW)
Control module weight: 4 kg (9 lbs)


Flow Tube Outer Diameter
in
mm
1
25
1.25
32
1.5
38
1.75
45
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)
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)
Flow Rate at 100°C (kg/hr)
Min Flow 7 9 11 13 16 19 23 31 39 46
Max Flow 95 180 270 420 570 810 1150 2140 3390 4850
Flow Rate at 400 °C (kg/hr)
Min Flow 10 13 16 19 24 28 34 46 58 70
Max Flow 70 135 200 310 425 600 860 1590 2520 3610


Options

  • High Speed Data Acquisition: Data output rate of 500 Hz is available.
  • Stand-Alone Configuration: SENSOR Tech-EFMHS application enables system operation from a Windows environment.
  • Customized Interface: Sensors can develop a customized device driver to interface with various host systems.


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