motcom® SiCOMS® / OCom

Oil mist Concentration monitoring



Oil mist inside an engine is produced when lubricants or fuel come in contact with hot surfaces. Damaged bearings can also lead to oil mist due to friction which induces heat. This oil mist becomes high ignitable at a concentration of 50mg/l or higher. An explosion can cause large scale engine damages and in a worst case the loss of human lives.

Functional description

The OCom system is an oil mist detection system without the disadvantages of older OMD systems. It is a pipe-free system, with sensors mounted directly at the engine wall which allows a quick and exact measuring of the produced oil mist in each compartment.

The measured data of each sensor are sent via a redundant serial bus to the Evaluator which processes and displays the data of the whole system. Up to 16 sensors can be connected to one Evaluator. For the case of an alarm, the Evaluator is equipped with two independent relais, so i.e. the shutdown of the engine can be initiated to prevent further damage.

Additionally, the measured data can be sent from the Evaluator to a PC with a specially designed software and/or to a OCom Remote Monitoring Unit.

The PC software is able to display, store and review the measured data.

The Remote Monitoring Unit is able to display the measured data like the Evaluator. It has also the capability to reset an alarm.



The sensor measures the oil mist directly where it is generated, inside the engine. It is very sensitive, so it can even measure smallest amounts of oil mist. Without any moving parts and without piping, the installation is very easy and almost no maintenance is needed. Sensors are available for Gas and Diesel engines.

Sensor SiCOMS

SOG and Diffusor

The Splash Oil Guard (SOG) protects the measuring section against splash oil inside the engine. With its multiple chamber design only oil mist can get into the measuring section.

In cases of high splash oil concentrations, the diffusor can be mounted onto the SOG for even better splash oil protection.

SOG and Diffusor


The Evaluator is designed to withstand the environment in the engine room. Its vibration resistance allows an installation near the engine without any special support. For installation on the engine, a special vibration damping feature is available.

The Evaluator consists of a alloy case, a liquid crystal display (LCD), three LEDs indicating the system status and five membrane buttons for user interaction. A powerful micro controler inside the Evaluator analyzes the measured data continously, displays the data on the LCD and triggers the alarm relais in case of oil mist. The bargraph display makes compartment localization easy.

OCom Evaluator
Oilmist concentration
Sensor Temperature
System Evaluator

click to see SiCOMS / OCom functionality as video animation

SiCOMS® / OCom Advantages

  • Easy installation due to simple electric cabling
  • Pipe-less and suction free oil mist detection and temperature measurement system
  • Online and continuous monitoring
  • Features the display of the oil mist concentration in mg/l
  • Measurement of the temperature in each compartment
  • Depending on the mounting location it is possible to measure the temperature of splash oil
  • Self-redundant measurement system
  • Maintenance free optical sensor system protected against splash oil contamination
  • No moving parts
  • OCom Sensor replacement is possible at any time
  • Minimizing engine maintenance and service costs
SiCOMS® / OCom Advantages
SiCOMS® / OCom Advantages

Current available certificates for SiCOMS® / OCom system:

Click here to see a SiCOMS / OCom demonstration video with the demo model

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