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.
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.
