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8.1.2 Custom fuel dilution curve
MINIFLASH FP(H) VISION is being used in order to evaluate the percentage of volatile substances in low volatile liquids
such as lubricant oil in machines or motors.
Prepare samples of different fuel dilutions with the oil and fuel in use, either per weight- or volume-percent and
determine the flash point.
Use therefore the same measuring program with the same parameters always to get the best results.
Perform for each sample with its concentration a test and note the results.
For the dilution analysis based on the flash point results following correlation is implemented:
Dilution [%]
Tflash [°C]
a [1]
b [1/°C]
c [1/°C²]
For the definition of the polynomial parameters a, b and c a minimum of 3 measurements with known dilution values
are necessary. A higher number would increase the accuracy. Based on measurement results and corresponding
dilution values, a, b and c can be easily calculated using a least square analysis.
The color flags on the instruments have the purpose to display contamination in a simple way after a measurement
was done. Red, yellow and green can be shown. These colors display 3 quality ranges for the fuel dilution curve.
The sequence for programming the color flags proceed from the lowest flashpoint (red) over the middle range of the
flashpoint (yellow) to the highest range of the flashpoint (green).
The higher the measured flashpoint is the lower the contamination is present in the sample.
e.g.: 1% Diesel in oil causes a higher flashpoint (because of the oil) than 5% Diesel in oil.
● Shows that the sample (e.g. oil with Diesel) is good for being used as a lubricant e.g.: in an engine. – within
2% from nominal value
● Shows that the sample (e.g. oil with Diesel) can be still used as a lubricant e.g.: in an engine. – between 2% to
5% from nominal value
● Shows that the sample (e.g. oil with Diesel) is not good for being used as a lubricant e.g.: in an engine. –
above 5% from nominal value
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