Functional description

Figure 1 shows the arrangement of the SENTRY Wireless

Temperature Monitoring System installed on a 4-stroke diesel

engine.

• A wireless sensor is fitted to the moving part (e.g. the

connecting rod of an engine)

• A Stationary Antenna is fitted to a bracket inside each cylinder

compartment in a position so that the sensor will pass nearby as

the engine runs.

• Coaxial cables connect the stationary antennas with the

Signal Processing Unit fitted outside. The bulkhead penetration

is made by use of a special, high IP-grade cable gland in which

the coaxial cable shield is terminated to ground.

• The Signal Processing Unit calculates the temperature and

transmits the result to the engine control system.

The SENTRY GB-300 system is based on Surface Accustic

Wave (SAW) -and radar technology. The sensors are passive,

have no battery and are in no need of an external power source.