OELCHECK test instrument: TOX-100
Sample quantity: approx. 5 ml
Unit: ppm
Test result: chlorine content
Analysis for: gas engine oils, in particular when operating with special gases
Brief description:

The oil sample is burned at a temperature of 1,000 °C with the addition of oxygen. The combustion gases are flushed into the titration cell with the gas flow. Among other things, this cell contains a silver electrode in an electrolyte solution. If the combustion gases contain chloride ions, the ions react with the silver ions. This reduces the silver concentration of the solution, and the current must be increased to compensate for the loss of silver ions in the solution.

Once the chlorine has reacted fully, the measurement is complete. The chlorine content of the sample is calculated from the current consumed for the measurement.

Statement: The fuel gas in facilities that operate with landfill gas or biogas is sometimes contaminated with chlorinated compounds. Chlorine can end up in the oil during combustion. Determining the chlorine content helps estimate the risk of aggressive acids forming, in order to avoid what is known as "pitting corrosion".
Test standard used: DIN 51408-2