High-End Oil-in-Water testing

ERACHECK is the industry leading measurement device for CFC-free and reliable oil-in-water or oil-in-soil testing. The only fully ASTM D7678 compliant analyzer on the market, it combines all benefits of the withdrawn IR method ASTM D3921 with the advantages of CFC-free solvents. It measures sub-ppm concentrations of Total Petroleum Hydrocarbons (TPH) and Total Oil and Grease (TOG) in water and soil.


Correlation to

    ASTM D3921
  • ASTM D4281
  • ASTM D7066
  • DIN 38409-H18
  • DIN 38409-H53
  • EN 14039
  • EPA 1664B
  • EPA 9071B
  • ISO 16703
  • ISO 9377-2
  • ISO 9377-2 (mod) OSPAR
  • IP426

360° View


Quantum Cascade Laser Technology

ERACHECK is the first and only measurement instrument on the market that uses the latest Quantum Cascade Laser (QCL) technology to measure liquid samples. This measurement technique is covered by international patents held by eralytics and our partner QuantaRed Technologies GmbH, allowing a major step in easy-to-use, precise and environmental friendly oil-in-water testing.

The inital research on Quantum Cascade Laser technology for measurements in the liquid phase was performed at the Vienna University of Technology. Soon the company Quanta Red was founded to pursue the goal of building a robust measurement cell for oil-in-water testing. With eralytics as a partner ERACHECK was developed in 2008/2009.

Dr. Bernhard Lendl, Professor at the Vienna University of Technology

Copy of Graph3

Unique Measurement Precision

ERACHECK shows a linear behavior over the broad measurement range of 0.2 to 2000 mg/l during oil-in-water testing. At the low end of the concentration ranges ERACHECK PRO offers a repeatability of 0.1mg/l and at the high end it still delivers a repeatability as good as 0.1%. ERACHECK also perfectly correlates to gas chromatography (e.g. ISO 9377-2 (mod) OSPAR), gravimetric (e.g. EPA 1664A) and infrared (e.g. ASTM D7066) oil-in-water testing methods.

  • ERACHECK showing the measurement menu
  • check_ans2_messung
  • Eracheck oil-in-water testing

Measurement Procedure

  • Perform the sample extraction: Typically 900ml water sample are extracted with 50ml cyclohexane
  • Select the calibration to use
  • Enter sample ID, water and cyclohexane volumes and the operator ID
  • Chose if you are using the cartridges
  • Press the RUN button
  • Run a background measurement
  • Run a sample measurement

You are guided through the whole procedure by instructions on the screen. The measurement procedure is visualized on the screen and after the measurement the result is displayed. The extraction parameters for the oil-in-water testing can be adjusted to your needs.

Feature Video

  • Latest laser technology (QCL) for highest precision
  • Patented measurement principle for oil-in-water testing
  • Use of an environmental friendly and low cost extraction solvent instead of CFCs
  • Fast & easy measurement of low concentration of oil in water or soil
  • Excellent correlation to a wide range of international standards
  • Usable for a wide range of applications

Operation Video

Watch this video to get an overview on the sample handling and measurement procedure of ERACHECK during oil-in-water testing.

Use of ERACHECK to Determine Reduction of Spilled Diesel

In this video by Directa Puls SpA the ERACHECK is used to determine the water quality of before a diesel spill and after the diesel spill is cleaned up by Basic G+ (a super-expanded, accordion-like graphitic product).

As it can be seen in the video, ERACHECK is able to measure an aqueous hydrocarbon content in the range of 0.2 mg/l.

Technical Specifications

Available Test Methods
ASTM D7678
Correlation to...
Infrared Spectroscopy: ASTM D3921, ASTM 7066, IP426, DIN 38409-H18, OSPAR IR method
Gas chromatography: ISO 9377-2, ISO 9377-2 (mod) OSPAR, ISO 16703, EN 14039 NEN 5733, MADEP-EPH DIN 38409-H53
Gravimetry: EPA 1664B, EPA 9071B, ASTM D4281, EN 14345
Extraction Solvents (CFC-free)
Cyclohexane (recommended)
Cyclopentane (ERACHECK PRO only)
Measurement Range
oil-in-water testing
up to 2 000 mg/L (ERACHECK PRO)
up to 200 mg/L (ERACHECK)
oil-in-soil testing
up to 72 000 mg/kg (ERACHECK PRO)
up to 7 200 mg/kg (ERACHECK)
Repeatability ERACHECK PRO
0 mg/L to 9.9 mg/L: ±0.1 mg/L
10 mg/L to 99.9 mg/L: ±0.3 mg/L
100 mg/L to 199.9 mg/L: ±0.5 mg/L
200 mg/L to 2 000 mg/L: ±2.0 mg/L
Repeatability ERACHECK
1.5 mg/L to 9.9 mg/L: ±0.7 mg/L
10 mg/L to 99.9 mg/L: ±1.0 mg/L
100 mg/L to 200 mg/L: ±1.5 mg/L