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Wireless temperature monitoring for moving parts


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Ultimate equipment for bearing temperature monitoring

SENTRY temperature sensor and antenna
SENTRY® wireless bearing temperature sensor and antenna.

Wireless bearing temperature sensor
Photo showing an installed SENTRY® wireless bearing temperature sensor.

The SENTRY® wireless bearing temperature monitoring system is capable of continuously measuring the metal temperature of bearings during compressor operation. Each sensor is individually interrogated from a multiplexed signal processing unit using a high frequency and low energy radar pulse. The radar pulse is transmitted to the wireless sensor through a coaxial cable to a stationary antenna located inside the crank case. When within 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.


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 millimeters, providing an very flexible installation inside the crank-case.

Main benefits

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

Main components

  • Wireless temperature sensor
  • Stationary reading antenna
  • Signal processing unit

Operating principle of the SENTRY system

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