Application report - Mobile hydraulics


The speed and rotation of direction of hydrostatic drives are to be measured and passed on to the control system. The environmental conditions place extreme demands on the reliability and sturdiness of the sensors.

These drives can be used for snowplows, street cleaning vehicles, agricultural machines and any sort of construction machines. But they can also be used in drill heads of tunnel boring machines or in special vehicles.


Depending on the version, the two-channel differential hall-effect sensors of the FA series either transmit two frequency signals, which are phase shifted by 90° or one frequency signal, and one rotational direction signal (0 / 24 V).

These sensors can be used at pressures of up to 10 bar and at temperatures of between –40 °C and +125 °C. They meet the toughest requirements in terms of thermal shock resistance, electromagnetic compatibility, vibration resistance, shock resistance and resistance against known oil types, diesel, salt fog and high-pressure cleaners.  

The sensors are protected by special individual wire seals, among others from fluids entering them through cables (IP69K protection class).

Another solution could also be the FE Push-Pull series. These sensors can be used at pressures of up to 20 bar and do not only impress with their small size but also with their high protection class IP6K9K.

Furthermore the output signal push-pull offers more flexibility regarding electronic connection. These sensors comes in standard with cable length 1500 mm and an overmolded DEUTSCH connector DT04-4P.

The sensors are used in hydrostatic drives exclusively by Bosch-Rexroth - Mobile Hydraulics.

The full report can be downloaded here: