|
Operating principle
|
CEIA altimetric radar microwaves
|
Doppler microwaves
|
Induction field
|
Optical
|
Ultrasonic
|
Electromechanical
|
|
Max. Distance measurement
|
99 m |
20 ÷ 25 m |
20 m |
10 ÷ 15 m |
28 m |
2 ÷ 3 m |
|
Digital setting of intervention distances
|
YES*
|
NO
|
NO
|
NO
|
NO
|
NO
|
|
Unaffected by environmental factors
|
YES
|
NO
|
NO
|
NO
|
NO
|
YES
|
|
Failsafe operation
|
YES
|
NO**
|
NO
|
YES
|
YES
|
- |
|
Relative velocity information
|
YES
|
YES
|
NO
|
NO
|
NO
|
NO
|
|
Accuracy of measurement independent of velocity of the cranes
|
YES
|
NO
|
YES
|
YES
|
NO
|
YES
|
|
Automatic channelling (synchronisation between two or more telemeters)
|
YES
|
YES
|
NO
|
YES
|
NO
|
- |
|
Easy to install
|
YES
|
YES
|
NO
|
NO
|
NO
|
YES
|