The system is based on the measurement of the time between the start and the reception of a transmitted microwaves signal on a crane and reflected by the opposite crane.

The standard equipment is transmitter and receiver.

The measurement is done from 4 up to 99 meters with 2 programmable thresholds. The central unit is fitted with a self diagnostic to achieve fail-safe mode reliability.

This microwaves system is independant of severe environments as meteorological effects, vibrations, electromagnetic or electrical interferences, etc.