Minimum Initial Investment Fuel Analysis

Fuel refiners are required to carry out regular analysis of their final products to ensure they are meeting regulations and to control the expense of adding additives to improve the cetane number. CFR engines are often used for this analysis, though this method is hard to carry out and expensive. A new technology, the Constant Volume Combustion Chamber (CVCC), which is more precise and easier to use, has been developed to replace CFR methods.

Constant Volume Combustion Chamber

CVCC uses a high pressure injection system, under electronic control, to disperse the sample for automated measurement allowing a new level of precision. PAC introduced this novel technology through the CID 510 which has already globally established itself. Using CVCC technology the CID 510 can deliver high precision measurements in the entire derived cetane number (DCN) range, from 15 to 100.  

A study ran jointly by the Energy Institute Inter-laboratory and ASTM using 20 different samples of diesels and biodiesels, and samples with different levels of cetane improving additives was ran to compare the DCN determined by the CFR engine and by the CID 510. The research was conducted by a group of 17 laboratories from the USA and Europe. The precise DCN figures obtained using the CID 510 in this research have been published by ASTM and CEN TC19 in the test methods ASTM D7668 and EN 16715.

CID 510 Test Methods

The CID 510 test methods (ASTM D7668 and EN 16715) are officially approved as alternative methods to ASTM D613 / ISO 5165. Since 2015 ASTM D7668 has been listed in diesel specifications ASTM D7467, ASTM D975 and ASTM D6751. The corresponding European test method (EN 16715) is now listed in EN590 - the European Diesel Specification.

In addition to the high level of precision and adherence to ASTM and ISO references the CID 510 also provides the advantages of;

  • Low maintenance requirements -  The instrument’s calibration is highly stable meaning daily/weekly calibrations are not required. Additionally, the method uses less combustion than CFR meaning there is less soot production meaning the test chamber does not require cleaning.
  • Intuitive use - Measurement and calibrations are completely automated
  • Very safe - The instrument is completely encased and protected for over-pressures and over-temperatures. The system also contains a built in fire monitoring and extinguishing system.
  • Save space - The instrument fits on the benchtop and has a footprint approx 70% smaller than the CFR engine.

The Herzog CIG 510 will help fuel refiners maintain their costs whilst adhering to increasingly stringent fuel regulations. Using electronically controlled injection technology the measurement of the ID and CD values of a fuel can reach a new level of precision, allowing refineries to increase their profitability.


The initial investment cost for the CID 510 is under half the cost for a competitors system. Additionally the operational costs of running testing is 80% less than testing using a CFR engine. This, combined with the highly precise nature of the CID 510, is why it is the best option on the market.

This information has been sourced, reviewed and adapted from materials provided by PAC L.P.

For more information on this source, please visit PAC L.P.


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