QMI Technology

The principle used in the early oil mist detection systems – obscuration light absorption – is still used by most manufacturers of oil mist detection systems to this day. The technology involves the extraction of the oil mist from selected points within the crankcase which is then transferred in sequence via discrete pipes to a central detector, usually mounted on the engine, with a facility for remote reading at a centralised panel.

However, these systems have a very slow response time which, in some cases, raises alarm after engine seizure or explosion has actually taken place.

When the lenses become obscured a false alarm can occur.

To provide 100% oil mist detection accuracy and reliability, QMI systems use a proprietary light scatter (nephelometry) technology proven to:

  • Eliminate false alarms
  • Deliver rapid readings within 500 milliseconds of oil mist being detected
  • Eliminate unnecessary pipework
  • Allow for linear output (true zero)
  • Quantify oil mist in mg/l
  • Allow for up to 50% lens obscurity
  • Allow for detector calibration
  • Allow the use of smaller detectors
  • Allow for optimum placement of detectors
  • Monitor the condition of the engine


“When there is an alarm there is an actual problem.”