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  • Overview
  • Specification

Fuel Economy Meter (FEM)

The SEMTECH-FEM provides accurate, real time fuel economy measurements using the carbon balance method. An NDIR analyzer measures CO, CO2, and HC as hexane.

Features

  • 1065 Compliant: The SEMTECH-FEM meets the US EPA 1065 compliance requirements for in-use testing.
  • High Speed Sampling: The SEMTECH-FEM internally samples the differential pressure channels at up to 5 kHz, accounting for every pressure pulse from an engine, from idle to maximum rpm. Standard output rate is 1 Hz.
  • Sample Handling: Sample probe, heated filter, water trap, and Nafion dryer are integrated into the tube electronics. An additional Nafion dryer is included in the control module.
  • Embedded Calibration: Calibration coefficients embedded in the flow tube electronics are automatically recognized on connection. Therefore, tubes of varying sizes can be interchanged 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.
  • Graphical Panel Display: A full color, graphic touch screen displays live data, and enables system setup and basic functions, such as zero and span.
  • Power Supply Monitoring: Power can be either 12 VDC, 110 VAC, or 220 VAC, with both current and voltage monitoring.
  • Weatherproof Construction: All components meet IP54 (NEMA 3) standards.
  • Shock Resistance: The mechanical design has been optimized for resistance to shock and vibration, ensuring data in the most rugged of in-use environments.
  • Design Details: Over a decade of experience in in-use emissions testing has gone into the design details of the SEMTECH ECOSTAR system, including:

    • EMI protection, including gaskets, filters and capped connectors
    • Stress relief for pneumatic connections
    • Channels for cable management
    • Standard Swagelok™ bulkhead connectors
    • Rugged Deutsch connectors for power and auxiliary connectors
    • Handles that lock to other SEMTECH ECOSTAR modules for stable system integration

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The SEMTECH-FEM is an all-new fuel economy meter with unsurpassed accuracy and ease of use. This patent pending design combines our high speed, high performance, exhaust flow meter with a CO/CO2 gas analyzer, packaged into an integrated system, providing accurate, real-time fuel economy measurements using the carbon balance method. Sample handling is integrated into the system, with an internal sample probe, heated filter, water trap, and Nafion dryer. The system accomodates standard flow tube sizes from 1" through 6" diameters, and is also scalable, enabling custom sizes upon request.


 

Power: 12 VDC nominal (10.5 - 14.5 VDC); 110 VAC or 220 VAC
Warm up time: 60 minutes to meet specifications
Storage Temperature: Dry -10°C to 60°C ambient
Operating Environment: -10°C to 45°C ambient
Dimensions: 43.6cm x 30.8cm x 9.1cm (WxDxH)*
Weight: 10 kg*
Data transmission: Ethernet, USB
Electromagnetic interference and susceptibility: CE Standards: IEC 61326: 2002-2
Exhaust temperature range: -5 to 700°C standard construction
Exhaust temperature accuracy: ±1% of reading or ± 2°C, whichever is greater
Flow measurement linearity: < 1.0% of full scale
Flow measurement accuracy:** ±2% of reading or ±0.5% of full scale, whichever is greater

*Weight and dimensions are for electronics module only. Tube assembly depends on the size selected.
** As measured on calibration flow stand.

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

 

Gas CO CO2 HC
Range 0 - 8% 0 - 20% 0 - 2,000ppm Hexane
0 - 4,000 ppm Propane
Accuracy ±50 ppm or ±2% rdg* ±0.1% or ±2% rdg* ±4 ppmC6 or ±3% rdg
Resolution 10 ppm 0.01% 1 ppmC6
Linearity
Intercept ≤ 0.5% range
0.990 ≤ Slope ≤ 1.01
SEE ≤ 1.0% range
R2 ≥ 0.998
Repeatability

±2% rdg or ±20 ppm*
(limited to >1000 ppm span)

±2% rdg or ± 0.05%* ± 2% rdg or 2 ppmC6
Noise ±20 ppm ±0.02% ±1 ppmC6
Span Drift (8 hrs) ±2% of span or ±20 ppm* ±2% of span or ±0.1%* ±2%rdg or 2 ppmC6
Zero Drift (1 hr) ±0.005% (25ppm) ±0.1% ±4 ppmC6
Analyzer Response Time T10-90 < 2.5s T10-90 < 2.5s T10-90 < 2.5s
System Response Time T10-90 < 3.5s T10-90 < 3.5s T10-90 < 3.5s
Data Rate <10 Hz programmable <10 Hz programmable 1 Hz
Flow Rate (nominal) 2 - 3 lpm 2 - 3 lpm 2 - 3 lpm

*whichever is greater

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