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     With the integration of electronics in modern hydraulic systems growing stronger every day, modern hydrostatic transmissions very often rely on "them circuit chips", which, in their turn, "make their decisions" on the basis of information supplied by the speed sensors, mounted in motors and sometimes in pumps.

    In Sauer Danfoss series 90 pumps and motors, for example, these small hall sensor based devices pick up the barrel rotation speed by sensing the alternative magnetic field, created by the moving magnetized ring, mounted on the barrel. These sensors DO NOT require physical contact with the ring to pick up speed. If you look at the pictures to the left, you'll see what happens when the contact occurs - both the magnetic ring and the speed sensor usually end up in scrap - and those do not come cheap!

    Here you will find some technical information and mounting instructions on Sauer Danfoss speed sensors. Under any circumstances remember - when in doubt - too much out is better than too much in!
Sauer Danfoss Series 90, badly mounted speed sensor
Sauer Danfoss Series 90, badly mounted speed sensor