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.) pairs 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 sensing the 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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