Biodiesel Rancimat

893 Professional Biodiesel Rancimat

The 893 Professional Biodiesel Rancimat determines the oxidation stability of biodiesel (fatty acid methyl esters, or FAME for short) and biodiesel blends.

In the Biodiesel Rancimat, increased temperature and a continuous stream of air through the sample accelerate its aging. The time that passes until oxidation takes place at a high rate – the induction time or oxidation stability index (OSI) – is measured.

The method is compliant with national and international standards, and it is particularly easy to perform, not least thanks to the modern, user-friendly StabNet software.

Key features

  • Compliant with standards including EN 14112, 15751 and EN 16568
  • User-friendly StabNet software for instrument control, results evaluation, and data management
  • Simultaneous analysis of up to eight samples
  • Color display on the instrument provides status overview of all measuring positions
  • Each sample position can be started separately and directly on the instrument

Quality assurance of biodiesel and biodiesel blends

Biodiesel sample on Biodiesel Rancimat system for oxidation stability measurement

Fatty acid methyl esters are slowly oxidized by atmospheric oxygen. The resulting oxidation products can cause damage to combustion engines.

The oxidation stability is therefore an important quality criterion for FAME. With the Biodiesel Rancimat, you can measure the oxidation stabilities of FAME and their mixtures with diesel fuel. It can also be used to examine the effectiveness of added antioxidants.

> Find out how oxidation stability is measured here

Determination according to national and international standards


Various standards describe oxidation stability testing with the Biodiesel Rancimat, including those listed below.

  • EN 14112 “Fat and oil derivatives – Fatty acid methyl esters (FAME) – Determination of oxidation stability (accelerated oxidation test)”
  • EN 15751 “Automotive fuels – Fatty acid methyl ester (FAME) fuel and blends with diesel fuel – Determination of oxidation stability by accelerated oxidation method”
  • EN 16568: “Automotive fuels – Fatty acid methyl esters (FAME) fuel und blends with diesel fuel – Determination of oxidation stability by rapidly accelerated oxidation method at 120 °C“

Data acquisition, evaluation, and archiving with the modern StabNet software

Logo of StabNet software for oxidation and thermal stability measurement

StabNet is the control hub for the Biodiesel Rancimat: all instrument functions are controlled via PC with the software.

However, it also evaluates your results, archives all determinations in its own database, and much, much more.

> Read more about StabNet here

The Biodiesel Rancimat – a multitasker

Starting a measurement on an 893 Professional Biodiesel Rancimat

The Biodiesel Rancimat has eight measuring positions, four in each one of its two independent heating blocks.

Because they are independent, different temperatures can be applied on the heating blocks, all at the same time. Each single measurement can be started individually – directly on the instrument – once the sample has been put in position.

Control all your stability measurements with one PC

Biodiesel Rancimat system for biodiesel stability measurement with dedicated software on laptop screen

If you’re dealing with larger sample loads, you can connect up to four Biodiesel Rancimats to a single PC.

This allows you to analyze up to 32 samples at a time, using a single computer.

Disposable reaction vessels – time-saving, clean, and inexpensive

Reaction vessel for biodiesel stability measurement

The Biodiesel Rancimat uses favorably-priced disposable reaction vessels.

This means that there is no need for time-consuming cleaning after each measurement. In addition to saving time and costs, the reproducibility of results is improved because the single-use vessels prevent carryover-effects.

The accelerated oxidation test method

Biodiesel Rancimat system for oxidation stability measurement in biodiesel and blends

Oxidation stability measurement of FAME using the Biodiesel Rancimat is a reliable and established method.

It is based on accelerating the aging process of the sample by raising its temperature and passing a continuous stream of air through it. The air flow transports volatile oxidation products from the sample vessel into a vessel containing distilled water. The conductivity of this water is continuously measured. Conductivity increases in this vessel once oxidation products emerge. A sudden, strong increase in conductivity – revealed by an inflection in the curve – marks the induction time that is a measure of oxidation stability.


PTT, Thailand

"We have been using Metrohm instruments for 20 years. […] Metrohm instruments are very good in terms of reliability and precision. Moreover, Metrohm supports us with good after-sales service."

Nakul Ketkeaw, vice president of the Laboratory Service Center of PTT Chemical Public Company Ltd., Thailand