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Magneto-Electric Rotation Detector

Question number FAQ-0862

What should be noted when installing multiple MP-9810/MP-9830 devices? (Additional question) I installed four MP-9810/MP-9830 devices on one gear. The material of the fixing jig is SUS400 series. The outer two devices operate even with a gap of 1 mm or more from the gear, but the inner two do not operate with a gap of 1 mm; they only operate with a gap of 0.8 mm. Why is that?

The SUS400 series is a magnetic material, so please change the fixture to a non-magnetic material.


The MP-9810/MP-9830 has magnets in the tip. It forms a magnetic circuit between the MP and the valleys of the gears, detecting changes in that magnetism.
Therefore, using magnetic materials for installation tends to weaken the magnetism between the gears, resulting in reduced sensitivity.
When using multiple units, adjustments such as narrowing the gap may be necessary due to the influence of the magnetism between the MPs.
Please refer to the instruction manual for usage precautions.

  • The detection gear is made of ferromagnetic material, with modules ranging from 1 to 3, and a tooth width of 3 mm or more.
  • The installation jigs for MP-9810/MP-9830 use non-magnetic materials and are fixed to prevent movement due to vibrations.
  • Install it facing the gear to match the MP positioning mark.
  • When installing multiple MPs, maintain a spacing of at least 35 mm.

In strong magnetic fields (in environments with magnetic changes), the magnetic circuit can easily become unstable, and as a result, it may not be detectable.
(For large AC motors, please consider installing them in positions less affected by the magnetic field.)
It is not suitable for precise position detection.
(When detecting protrusions, there is variation in the relationship between the protrusion position and the signal.)

Last updated: 2025-03-27