SENSOR MAGNET SELECTION

Magnetic field profiles example

Magnetic field profiles example

Magnets, electromagnets and solenoids could all be used to trigger magnetic sensors such as Reed Switches and Hall Effect devices. The choice of magnet is determined by the actual application and the environment of the application. Temperature, distance and location of the magnet, presence of other magnetic field sources and the presence of any ferromagnetic materials all need taking into account.

To activate a Reed Switch or Hall Effect device requires selecting the correct size, shape and grade of magnet for the application (to give the required magnetic field strength at the distance away from the magnet). If you have a magnet that works but you need to change how your application is activated, we can assist you.

We can help you specify the required magnet and we can produce and supply stock and custom produced magnets (to all the magnet material types, grades and coatings we currently offer).

SENSOR MAGNET SELECTION – SIZE GUIDANCE

Magnetic field drops off quickly the further away the sensor is from the magnet.
To gain more field at the sensor, reduce the distance from magnet to sensor if possible.
To gain more field at the same distance increase magnet diameter.
To gain more field at the same distance increase magnet height (gain does plateau off with increasing height works well for thin magnets).
To gain more field at the same distance increase magnet Br (i.e. select a stronger magnet grade or even a stronger magnetic material if feasible).

 

D6x2.5mm N35SH Disc Magnets for Rotary Position Sensors

D6x2.5mm N35SH Disc Magnets Diametral for Rotary Position Sensors, Rare Earth Round Neodymium Magnets, Max. 150 °C Sensor Permanent Magnets N35SH Disc Magnets Part No.: HSND-0062.5D-35SH Magnetisation Grade: N35SH Material: Sintered Neodymium-Iron-Boron (Rare Earth NdFeB) Plating / Coating: Nickel (Ni-Cu-Ni) Magnet Shape: Disc, Disk, Round Magnet Size: D6 x 2.5 mm Magnetisation Direction: Diametral / Diametrical Residual Magnetic […]

Diametric Disc Magnet NdFeB N35 D6x2.5mm

Diametric Disc Magnet NdFeB N35 D6x2.5mm

Diametric Disc Magnet NdFeB N35 D6x2.5mm, Diametrical Neo Disc Magnets for Rotary Position Sensor, Round NdFeB Magnet Disc Magnet NdFeB Part No.: HSND-0062.5D-35 Magnetisation Grade: N35 Material: Sintered Neodymium-Iron-Boron (Rare Earth NdFeB) Plating / Coating: Nickel (Ni-Cu-Ni) Magnet Shape: Disc, Disk, Round Magnet Size: D6 x 2.5 mm Magnetisation Direction: Diametral / Diametrical Residual Magnetic Flux Density (Br): 1170-1220 mT (11.7-12.2 […]

D6x2.5mm N35H Diametric Disc Magnets for rotary position sensor

D6x2.5mm N35H Diametric Disc Magnets

D6x2.5mm N35H Diametric Disc Magnets for rotary position sensor, Rotary Position Sensor Diametrical Magnetic Discs, Sintered Rare Earth NdFeB Disc Magnets, Sensor Magnet Diametric Disc Magnets Part No.: HSND-0062.5D-35H Magnetisation Grade: N35H Material: Sintered Neodymium-Iron-Boron (Rare Earth NdFeB) Plating / Coating: Nickel (Ni-Cu-Ni) Magnet Shape: Disc, Disk, Round Magnet Size: D6 x 2.5 mm Magnetisation Direction: Diametral / Diametrical Residual Magnetic […]

D8x2.5mm Axial Disc Magnets N35H for Linear Position Sensor

D8x2.5mm Axial Disc Magnets N35H for Linear Position Sensor

D8x2.5mm Axial Disc Magnets N35H for Linear Position Sensor,  Sintered NdFeB Disc Magnets, N35H Rare Earth Neodymium Sensor Magnet, Magnets for Magnetic Rotary Encoder Disc Magnets N35H Part No.: HSND-0082.5-35H Magnetisation Grade: N35H Material: Sintered Neodymium-Iron-Boron (Rare Earth NdFeB) Plating / Coating: Nickel (Ni-Cu-Ni) Magnet Shape: Disc, Disk, Round Magnet Size: D8 x 2.5 mm Magnetisation Direction: Axial Residual […]

D6x2.5mm N35H Axial Disc Magnets for Linear Position Sensor

D6x2.5mm N35H Axial Disc Magnets for Linear Position Sensor

D6x2.5mm N35H Axial Disc Magnets for Linear Position Sensor,  Sintered NdFeB Disc Magnets, Rare Earth Neodymium Sensor Magnet, Linear Position Sensor Magnets Axial Disc Magnets Part No.: HSND-0062.5-35H Magnetisation Grade: N35H Material: Sintered Neodymium-Iron-Boron (Rare Earth NdFeB) Plating / Coating: Nickel (Ni-Cu-Ni) Magnet Shape: Disc, Disk, Round Magnet Size: D6 x 2.5 mm Magnetisation Direction: Axial Residual Magnetic […]

D4x2.5mm Axial N35H Disc Magnet for Linear Position Sensor

D4x2.5mm Axial N35H Disc Magnet for Linear Position Sensor

D4x2.5mm Axial N35H Disc Magnet for Linear Position Sensor, NdFeB Sintered Disc Magnet, Sensor Rare Earth Neodymium Magnet N35H Disc Magnet Part No.: HSND-0042.5-35H Magnetisation Grade: N35H Material: Sintered Neodymium-Iron-Boron (Rare Earth NdFeB) Plating / Coating: Nickel (Ni-Cu-Ni) Magnet Shape: Disc, Disk, Round Magnet Size: D4 x 2.5 mm Magnetisation Direction: Axial Residual Magnetic Flux Density (Br): […]