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AFIDA - Advanced Fuel Ignition Delay Analyser

Part Number SA6000-0

Indicated Cetane Number Analysis

AFIDA is a revolutionary development providing fully automated determination of the Indicated Cetane Number (ICN) of diesel and diesel related fuels using test method IP 617.

The analyser uses a Constant Volume Combustion Chamber (CVCC) and incorporates a unique and patented high pressure injection system that generates fine fuel droplets similar to modern common rail injectors in most diesel engines.

An ultra robust temperature controlled piezo electric injector provides rapid switching and highly repeatable fuel metering, offering improved performance and consistency when compared with solenoid controlled injectors and pintle type nozzles.

The analyser provides very fast, efficient and calibrated ICN determinations, tests are fully automated via an integral 36 position carousel and auto sampler.


Direct correlation to ASTM D613 (ISO 5165) engine tests: The traditional Cetane Engine methods establish an ignition delay period for the test fuel which is referenced to a primary reference fuel scale.

Existing Constant Volume Combustion Chamber (CVCC) technology provide a Derived Cetane Number (DCN) result based on a historical averaged correlation equation applied to the ignition delay of the fuel sample.

The new generation AFIDA technology is a significant step forward as it uses the same Primary Reference Fuels as specified in the Cetane Engine method to provide a calibrated cetane number measurement.

Standardisation: Industry stakeholders recognise the advantages of the AFIDA with CEN, ASTM and the Energy Institute forming new working groups to develop test methodology; IP 617 is already published as an approved test method. Inter-laboratory studies showed outstanding precision and excellent correlation when compared with samples with known Cetane Numbers. The coefficient of determination (R) is 0.98. An investigation into carryover with 2-EHN Cetane Improver showed no effect.


Chamber temperature 580C
Chamber pressure 17.5 bar
Injection pressure 1000 bar
Compressed air 20.9 0.5 % O2
Sample volume approx. 40 ml for analysis and cleaning
Warm up time approx. 45 min
Analysis time approx. 25 min per sample
Size (DxHxW) 1300 mm x 800 mm x 600 mm (excluding platform)
Weight 160 kg 100 kg (excluding platform)


IP 617Determination of generic cetane number (G-CN) of fuels using a constant volume combustion chamber: primary reference fuels calibration (PRFC) method
BS EN 17155Liquid petroleum products - determination of indicated cetane number (ICN) of middle distillate fuels - primary reference fuels calibration method using a constant volume combustion chamber
ASTM D613Standard Test Method for Cetane Number of Diesel Fuel Oil
IP 41Determination of the ignition quality of diesel fuels Centane engine method
BS EN ISO 5165, BS 2000-41, ISO 5165Determination of the ignition quality of diesel fuels. Cetane engine method
ASTM D8183Determination of Indicated Cetane Number (ICN) of Diesel fuel oils using a Constant Volume Combustion Chamber - reference fuels calibration method
AFIDA Cetane Analyser


Excellent correlation to ASTM D613, IP 41 and BS EN ISO 5165, BS 2000-41, ISO 5165
Wide sample types - middle distillates, blend components, biodiesel, FAME, XTL, HVO, heating oil and Jet A1
Suitable for use with Cetane improvers
Integral 36 place carousel and auto sampler
Calibrated with industry approved PRFs over the range 35 to 85 ICN
Fully automated measurement
Small sample volume (approx 40 ml/analysis including flushing)
Short analysis time of approximately 25 minutes per sample
Precise and reproducible software controlled determination of ICN
Advanced electronically controlled high pressure fuel injection system with piezo electric injector
Safe operation - integral safety monitoring functions
Results saved to PC or for download
Stable calibration - fixed test conditions eliminates routine temperature tuning
Low running costs, single gas supply for combustion air
Uninterruptable power supply to maintain cooling in the event of power failure


ASTM D613, ASTM D8183, BS EN ISO 5165, BS 2000-41, ISO 5165, EN 17155:2017, IP 41, IP 617


Petroleum - Fuels & Oils

Copyright Stanhope–Seta Limited 2014