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Crosshead and crank temperature monitoring - SENTRY

The SENTRY® wireless bearing temperature monitoring system is capable of continuously measuring the metal temperature of bearings during engine operation. Each sensor is individually interrogated from a multiplexed signal processing unit using a high frequency and low energy radar pulse.

Ultimate equipment for bearing temperature monitoring

The radar pulse is transmitted to the wireless sensor via a coaxial cable to a stationary antenna positioned inside the crank case. Within the interrogation range of the stationary antenna the sensor responds to the radar pulse by reflecting a pulse pattern back to the signal processing unit. The characteristics of the reflected pulse is uniquely defined by the temperature.

Sentry sensor

Main benefits

  • Significantly reduced risk of unforeseeable repair costs
  • Stand-alone or fully integrated with the alarm monitoring system
  • Improved operational safety for crew and vessel
  • Type approved to replace oil mist detectors
  • Compact and simple installation

Main components

  • Wireless temperature sensor
  • Stationary reading antenna
  • Signal processing unit
Operating principle of the SENTRY system


The SENTRY® system is based on a sensor technology called Surface Acoustic Wave (SAW), which opens for non-contact wireless temperature sensing without using batteries or transmitting inductive power to the sensor. In this system the air-gap between the sensor and the stationary antenna can vary between 10 and 50 millimetres providing an extremely flexible installation inside the crank-case.

Services and support

  • 24/7 Technical support

    Our 24/7 technical support team is there to help at any time, day or night, wherever your vessel is.


    We understand the importance of having the right parts, available in the right place, at the right time.

  • Training

    Ensure that your crew is properly and thoroughly trained. This will reduce operational risk, downtime and maximise return on asset investment.

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