Magnetic switches

Limit switches, motion, rotation, speed and direction sensors

Working principle
A reed contact in a housing is actuated by a permanent magnet. This allows magnetic switches to

be used as limit switches. For checking movement (motion sensors etc.) a pair of magnets with

opposing magnetic poles are mounted onto a shaft (or some other moving or rotating component)

so that they pass very close to a magnetic switch. If the contact is not triggered within a specified

time interval, a state of standstill or under-speed will be recognised. Rotation speed and linear

speed can be monitored using the same principle.
With a suitable arrangement of magnets on a rotating appliance, magnetic switches can be

used to sense the direction of rotation.

Area of application
As a limit switch and for the sensing of continuous movement or the speed of movement on a wide

variety of rotating and other machinery.

Temperature
- 20 ° C to 80 ° C

Materials
Brass, stainless-steel, glass fibre reinforced polyamide, aluminium, polyethylene.

Output
Switched output or continuous analogue output through suitable measurement converters.
For the sensing of speeds of rotation in a range from 200 - 3000 rpm.

Fitting and Types
Right-angled or cylindrical switch housing; mounted using nuts, screws or pins and thus suited to a
large number of applications.

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