Condition monitoring leader CM Technologies(CMT) has added a fuel injection acoustic emission sensor to its proprietary PREMET X range of two- and four-stroke diesel engine performance indicators.
The new device allows engineers to monitor the acoustic signature of a diesel engine’s fuel injection system to detect any problems with fuel injectors, nozzles, and pumps. Clogged or worn nozzles, leaking injectors, and damaged fuel pumps can affect fuel atomisation and timing, leading to poor engine performance, increased fuel consumption, increased emissions and potentially engine failure.
Unlike accelerometer-based sensors, which need to be mounted internally and can be affected by mechanical load, high temperatures and pressures, CMT’s Fuel Injection Acoustic Emissions Sensor is based around a unique EMAT(Electromagnetic acoustic transducer) technology.
This non-contact ultrasonic technology means there is no need to access internal components. It incorporates a built-in amplifier and a signal conditioning module to monitor frequencies in the 200-700kHz range and since no direct contact is needed, it can measure through coated surfaces, unaffected by pollutants, oxidation or surface roughness. The senor features a magnetic tip for an easy connection on any metallic surface.
Depending on where the sensor is placed, different aspects of the fuel injection process can be monitored. For example, if the sensor is placed on the cylinder head the injection and exhaust valve timing can be monitored, while the performance of each nozzle can be gleaned by placing the sensor on the relevant tie rod.
Together with the detailed combustion pressure data provided by PREMET X, the simultaneous monitoring of noises during the fuel injection process provides a more complete picture of the performance of the engine. This includes important information relating to combustion, ignition, and injection timing, fuel pump activity as well as injection and ignition delay.

-TEL: +49(4124)50-4430
-https://cmtechnologies.de/en/