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Crosshead and crank temperature monitoring


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Ultimate equipment for bearing temperature monitoring

wireless bearing sensor
SENTRY® wireless bearing sensor and antenna.

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.

Sentry sensor
Photo showing the SENTRY® sensor installed inside the crank case.

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.

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.

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