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Spectral Fuel Analysis in Seconds

ERASPEC is eralytics’ industry-proven multi-fuel analyzer with several thousand installations worldwide. It offers measurements of fuel component concentrations, complex properties like RON or cetane number, and density for gasoline, diesel fuel, jet fuel and even specialized fuels like ethanol fuels. A single push of a button delivers all results within 1 minute.


  • ASTM D5845
  • ASTM D6277
  • ASTM D7777
  • ASTM D4052
  • ISO 12185
  • ASTM D7806
  • E1655
  • EN 238
  • EN 14078
  • ISO 15212
  • IP559
  • ASTM D8321

Correlation to

  • ASTM D86
  • ASTM D323
  • ASTM D613
  • ASTM D976
  • ASTM D2699
  • ASTM D2700
  • ASTM D3948
  • ASTM D4814
  • ASTM D5191ASTM D6378
  • ASTM D5769
  • ASTM D4815
  • ASTM D7371
  • ASTM D1322
  • ASTM D1319
  • ASTM D1840
  • ISO 5163
  • ISO 5164
  • ISO 5165
  • EN 13016-1
  • EN 13016-2
  • ISO 3405

360° View

FTIR Fuel Analysis

In FTIR fuel analysis a spectrum of the analyzed fuel is recorded in the mid-infrared region using an Fourier transform spectrometer. Depending on the chosen method a single measurement is able to detect over 40 parameters within a few seconds. For gasoline measurements e.g. RON, MON, AKI, distillation properties, esters and aromatics concentrations are determined. When analyzing diesel aromatics, cetane improvers, biodiesel and many more can be quantified. Analyzing biodiesel ERASPEC distinguishes between FAME / FAEE and vegetable oil. It measures FAME in full compliance with ASTM D7806 and EN 14078. Typical parameters for jet fuel include FAME, aromatics, freezing and flash point, smoke point and distillation parameter, as well as viscosity.

Gasoline spectrum measured with ERASPEC

Integrated ASTM D4052 Density Measurement

ERASPEC is again expanding the horizon of portable fuel testing with eralytics’ integrated state-of the-art temperature-controlled U-tube density meter modules DENS7777 and DENS4052. In combination with the ultra-light density meter module DENS4052 (patent pending), offering density measurements in full compliance with ASTM D4052 & ISO 12185 (r = 0.0001 g/cm3), ERASPEC can measure density, benzene and FAME in full compliance with international fuel specifications, like ASTM D4814, EN228 and EN590. In its standard version ERASPEC is now equipped with eralytics new DENS7777 U-tube density module that is also temperature-controlled and measures in full compliance with ASTM D7777 & ISO 15212 (r = 0.0005 g/cm3).

ERASPEC with density meter module DENS4052

Concentrations vs. Parameters

ERASPEC can directly derive fuel component concentrations from the measured IR spectrum. That includes aromatics such as benzene (ASTM D6277), oxygenates such as MTBE or ethanol (ASTM D5845) and octane boosters such as MMT for the measurements of gasoline. Knowing the exact fuel composition, however, also allows to calculate more complex fuel parameters. ERASPEC uses chemometrical models, based on fuel libraries, to calculate parameters such as RON, MON or distillation and evaporation fractions from the spectrum for gasoline. It covers cetane number and index and many more for diesel fuel.

ERASPEC Concentration and Parameters

Expandable Database

Based on several thousand ERASPEC installations around the world eralytics can rely on a huge experience offering tailor-made databases of international fuel calibration samples with known parameters. Adding customer samples to the databases is as easy as running a measurement and entering the corresponding reference values afterwards. The added data is immediately available for the next measurement as the chemometrical models are calculated on the fly. Next to the expandable database ERASPECs’ intuitive software allows for the easy creation of various library sets and a convenient switch between them. Additionally the exchange of libraries between several ERASPEC instruments is very easy and can be done directly without the need of a PC.

ERASPEC Expandable Database

Unknown or Contaminated Samples

The “Automatic Fuel Recognition” (AFR) Module allows an easy measurement of unknown samples with the ERASPEC fuel analyzer. It recognizes if gasoline, diesel or jet fuel is measured and automatically starts the correct analysis according to the registered fuel type.
Most common contaminations of gasoline can be measured with the “Gasoline Contamination Module”. Typical substances that can be quantified are DMM, N-Methyl-Aniline, Diolefines, Aniline, DMC, various Butyl-Acetates and more.

This makes the ERASPEC fuel analyzer to a reliable tool to fight fuel adulteration fraud directly at the gas stations.

4 gas pump nozzles at a gas station

Patented Design

The heart of the ERASPEC fuel analyzer is a patented corner-cube retro-reflector FTIR spectrometer. For highest precision it is laser and  temperature controlled and its spectral resolution is tailored to the task of fuel analysis. This reduces any noise to an absolute minimum, increasing the repeatability and lowering the possible limits of detection. ERASPECS’ unique triple cell design is now the standard for all analyzers making future instrument upgrades extremely easy. ERASPEC automatically selects between a 20 µm and a 100 µm path length measurement cell depending on the fuel analyzed. This allows ERASPEC to always deliver the best measurement result. A third cell is used to run background measurements if needed. For special applications (e.g. advanced cetane improver determination) a unique fourfold-cell design with wider path-length is available.


  • Retroreflectors used in ERASPEC
  • IMG_0402

Option: 10-position autosampler for high sample throughput

eralytics’ 10-position autosampler is an optional accessory for the spectral fuel analyzer ERASPEC. The 10-position autosampler is directly attached to the instrument allowing it to conveniently connect up to 10 samples simultaneously. It is the perfect solution for higher sample throughput and even more efficiency. All instruments maintain their portability, even with the 10-position autosampler attached. Read more >>

ERASPEC with Autosampler

Measurement Procedure

To perform spectral analysis with the ERASPEC fuel analyzer can be done in 4 simple steps:

  • Enter sample ID and operator name
  • Select the measurement standard and the library to be used for calculating properties
  • Put your sample next to the fuel analyzer and insert the inlet tube
  • Press the RUN button

The measurement steps are visualized on the display, showing the deflection of the moving mirror of the interferometer. When the measurement is completed the results are displayed and can be printed or added to a library with a single click. When adding the results of the fuel analyzer to a library an editor for entering known properties will appear. This will improve the quality of future measurements using the ERASPEC fuel analyzer, as the library can be tailored to a specific application.


  • eraspec_Web2A
  • eraspec_Web2B
  • eraspec_Web2C

Parameters Gasoline Module

Research Octane Number (RON)70 - 110
Motor Octane Number (MON)60 - 100
Anti Knock Index (AKI)65 - 105
RVP & DVPE35 - 105 kPa
Distillation fractionsIBP, T10, T50, T90, FBP
Evaporation fractionsE70, E100, E150, E180, E200, E300, E350, E370
Density (built-in U-tube cell)0 - 3 gcm-3
Driveability Index, VOC Emissions Calculator, Vapor Lock Index (VLI), User Definable Parameters
Sum ParametersRange
Aromatics10 - 80 Vol%
Olefins10 - 80 Vol%
Di-Olefins20 - 20 Vol%
Oxygenates20 - 80 Vol%
Oxygen20 - 12 wt%
Anilines20 - 25 Vol%
Esters20 - 30 Vol%
Saturates0 - 100 Vol%
Oxygenate Parameters2Range
MTBE0 - 20 Vol%
ETBE0 - 25 Vol%
TAME0 - 25 Vol%
TAEE0 - 20 Vol%
DIPE0 - 20 Vol%
Dimethoxymethane (DMM)0 - 20 Vol%
Methanol0 - 15 Vol%
Ethanol0 - 100 Vol%
Iso-Propanol0 - 20 Vol%
1-Butanol0 - 100 Vol%
2-Butanol0 - 25 Vol%
Isobutanol0 - 50 Vol%
tert-Butanol0 - 25 Vol%
Dimethylcarbonate (DMC)0 - 15 Vol%
Methylacetate0 - 15 Vol%
Ethylacetate0 - 15 Vol%
Isobutylacetate0 - 15 Vol%
Sec-Butylacetate0 - 15 Vol%
Nitromethane 0 - 9 m%
Benzene0 -10 Vol%
Toluene0 - 20 Vol%
o-Xylene0 - 20 Vol%
m-Xylene0 - 20 Vol%
p-Xylene0 - 20 Vol%
Ethylbenzene0 - 20 Vol%
Propylbenzene0 - 20 Vol%
2-Ethyltoluene0 - 20 Vol%
3-Ethyltoluene0 - 20 Vol%
4-Ethyltoluene0 - 20 Vol%
Pseudocumene0 - 20 Vol%
Hemillitol0 - 20 Vol%
Mesitylene0 - 20 Vol%
Iso-Durene0 - 20 Vol%
Durene0 - 20 Vol%
Naphthalene0 - 10 Vol%
Octane Boosters2Range
MMT0 - 10000 mg/L
CMT0 - 10000 mg/L
Manganese (by MMT)0 - 2500 mg/L
DCPD (Dicyclopentadiene)0 - 15 Vol%
Aniline0 - 15 Vol%
N-Methylaniline0 - 15 Vol%
o-Methoxyaniline0 - 20 Vol%
o-Toluidine0 - 20 Vol%
m-Toluidine0 - 20 Vol%
p-Toluidine0 - 20 Vol%
N,N, Dimethylaniline0 - 20 Vol%
Easy addition of unlimited user-defined properties.
1 … The range and repeatability for all correlated properties depend on the used database.
2 … Lowest concentrations correspond to the limit of detection (LOD), all concentrations in Vol% and wt%

Parameters Diesel Module

Cetane Number20 - 80
Cetane Index20 - 80
Distillation fractionsIBP, T10, T50, T65, T85, T90, T95, FBP
Evaporation fractionsE250, E350
CFPP-50 - +20 °C
Viscosity @ 40 °C0 - 10 mm2/s
Density (built-in U-tube cell)0 - 3 gcm-3
Easy addition of unlimited user-defined properties.
1 … The range and repeatability for all correlated properties depend on the used database.
2 … Lowest concentrations correspond to the limit of detection (LOD), all concentrations in Vol% and wt%.
Total Aromatics10 - 80 Vol%
Polynuclear Aromatics (PNA)10 - 80 Vol%
Benzene20 - 5 Vol%
Cetane Improver (2-EHN, IPN)20 - 20 000 mg/L
Dimethoxymethane (Methylal)20 - 20 Vol%
FAME20 - 100 Vol%
FAEE20 - 100 Vol%
Vegetable Oil20 - 65 Vol%
Distinction between FAME (Biodiesel) and vegetable oil
Separate calibrations for different FAME / FAEE sources

Parameters Jet Fuel Module

Freezing Point-80 - -20 °C
Flash Point-20 - +100 °C
Smoke Point0 - 1000 mm
Viscosity at 20°C1.2 - 2.1 mPas
Viscosity at -20°C0 - 10 mPas
Distillation fractionsIBP, T10, T50, T65, T85, T90, T95, FBP
MSEP50 - 100 %
Density (built-in U-tube cell)0 - 3 gcm-3
Total Aromatics10 - 80 Vol%
FAME concentration20 - 6 Vol%
Polynuclear Aromatics (PNA)10 - 10 Vol%
Easy addition of unlimited user-defined properties.
1 … The range and repeatability for all correlated properties depend on the used database.
2 … Lowest concentrations correspond to the limit of detection (LOD), all concentrations in Vol% and wt%

Parameters Fuel Ethanol & Fuel Methanol Modules

Fuel Ethanol Module

Ethanol0 - 100 Vol%
Water0 - 100 Vol%
Methanol0 - 15 Vol%
Denaturant0 - 100 Vol%
Density (built-in U-tube cell)0 - 3 gcm-3

Fuel Methanol Module

Methanol0 - 100 Vol%
Density (built-in U-tube cell)0 - 3 gcm-3
Easy addition of unlimited user-defined properties.
2 … Lowest concentrations correspond to the limit of detection (LOD), all concentrations in Vol% and wt%

ERASPEC Feature Video

  • Characterization of over 40 fuel parameters within 60 seconds
  • Patented rugged FTIR and laser / temperature design for highest precision
  • Factory calibrated with a matrix of several hundred international fuels
  • Easy expandable libraries to tailor the reference matrix to special applications
  • Tailored path-lengths for various applications
  • Built-in oscillation U-tube density meter (ISO 15212)
  • Comprehensive fuel analysis of gasoline, diesel fuel and jet fuel in seconds
  • Biodiesel (ASTM D7806) and vegetable oil detection in diesel fuel

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ERASPEC Operation Video

Watch this video to get an overview of the standard operation of ERASPEC: From installation to measurement and some extended measuring options.


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Technical Specifications

Available Test Methods
ASTM D5845, ASTM D6277, D4052/D7777, ASTM D7806, E1655, EN 238, EN 14078, ISO 12185, ISO 15212, IP559, US D.O.T / RCRA / NAVY and NATO reference methods
Correlation to...
ASTM D56, D86, D323, D445, D613, D976, D1319, D1322, D1840, D2386, D2699, D2700, D3828, D4814, D4815, D5191, D5769, D6371, D6379, D6378, D7153, D7371; EN 116, EN 13016; ISO 3104, ISO 3405, ISO 5163, ISO 5164, ISO 5165
Spectrometer Type
Patented mid-FTIR spectrometer
Laser and temperature controlled design
Measurement Cell
20 µm and / or 100 µm path length cell, reference cell
Optimized dual or triple position cell design for gasoline, diesel, and jet fuel measurements
Optional fourfold-cell for special applications (e.g. 400 µm)
Factory calibrated with a matrix of several hundred international fuels
Spectral Libraries
Easy addition, expansion and exchange of individual fuel libraries
On the fly recalculation of libraries without delaying any measurements
Density Meter
Temp. controlled oscillating U-tube density meter (0-3 g/cm3):
Standard density module (r = 0.0005 g/cm3; ASTM D7777)
High precision density module (r = 0.0001 g/cm3; ASTM D4052)
Available Analyzer Modules
- Gasoline module (ASTM D5845, ASTM D6277, and several correlation methods)
- MMT / CMT module (determination of MMT, CMT and Manganese)
- Contamination gasoline module
- Benzene (determination according to EN 238)
- Synthetic fuel module (for gasoline)
- Diesel module (with several preprogrammed correlation methods)
- 2EHN Cetan improver module
- Low FAME module (for determination of FAME in diesel or jet fuel)
- EU FAME module (for determination of FAME according to EN 14078)
- Ethanol fuel module (ASTM D4806)
- Methanol fuel module
- Automatic fuel recognition module
- Jet fuel module (with several preprogrammed correlation methods)
Measurement Time
60 seconds, includes fully automated rinsing, filling and measurement (DENS7777)
Warm-up time 30 second

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