FAQ

magnete_prod

Most Reed Sensor applications are operated by permanent magnets.

 

We provide assistance to select the suitable magnet for your sensor application. Either from our standard range or to your own design.

  • What is the cheapest magnet material?

    Ferrite

  • What is meant by "Rare Earth Magnets"?

    SmCo (Samarium-Cobalt) and NdFeB (Neodymium-Iron-Boron) magnets belong to the "Rare Eearth" types since they contain Samarium or Neodymium. These elements are used in high-energy magnets.

  • What stands NdFeB, SmCo and AlNiCo for?

    • NdFeB (Neodymium-Iron-Boron)
    • SmCo (Samarium-Cobalt)
    • AlNiCo (Aluminium-Nickel-Cobalt)
  • Do you also supply single pole magnets?

    Sorry, there is no magnetic "mono or single pole" available (like a battery always has two poles).

  • Do magnets lose their magnetization after some time?

    Provided that the magnet is not exposed to strong demagnetizing fields, radioactivity or temperatures exceeding the max. OP temperature, the magnetization remains nearly unchanged.

  • Why is Remanence Br much higher than what I measure using a Gaussmeter on a pole surface?

    The Remanence Br (in Gauss or mT) is stated for the material grade, not for the individual surface value of a magnet type.

  • Where is North / South pole?

    The north pole of a magnet points toward geographic north, which is magnetic south, since unlike poles attract. So the south pole of a magnet points toward geographic south, which is magnetic north. Geographic North = magnetic South. Geographic South = magnetic North. We supply also magnets with pole marking.



Selection Guide

Magnet selection criteria
Costs Ferrite AlNiCo NdFeB SmCo
Energy Product
Ferrite AlNiCo SmCo NdFeB
Operating Temperature max. NdFeB Ferrite SmCo AlNiCo
Corrosion Resistance NdFeB SmCo AlNiCo Ferrite
Resistence to Demagnetization AlNiCo Ferrite NdFeB SmCo
Mechanical Strength
Ferrite SmCo NdFeB AlNiCo
Temperature Coefficient
AlNiCo SmCo NdFeB Ferrite

 

Additional information about magnets