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As
the term magnetic switches suggests, these are operated by
magnetic fields; another description widely used is magnetic
"SENSOR". As our eyes sense change of light, our
ears sense the change of sound, magnetic switches/sensors
sense the change of magnetic flux in Pneumatic and Hydraulic
cylinders. When magnetic switches sense a magnetic field it
will give a switching signal, through a control circuit, allowing
sensing or control operation to be achieved.
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Because
of the characteristic of magnetic switches they can sense a change
of magnetic field, such as a moving magnet thereby allowing the
magnetic switch to sense the change of magnetic field relative to
the position of the magnet, such as in a Pneumatic or Hydraulic
cylinder, whereby the magnet is attached to a moving piston and
thus position of the moving part (i.e. piston) can be detected.
| a |
Magnet
is mounted on the piston of a cylinder and is moving together
with the piston |
| b |
Magnetic
switch is fixed on the of surface of a cylinder, when the magnet
moves to the position under a magnetic switch, the switch will
operate due to the change of magnetic field and give a switching
signal. |
| c |
Thus
the position of the piston can be identified and a resulting
signal generated to continue the sequence of a circuit. |
The magnetic switches available in the market
can be classified in two different groups. One group are switches
with contacts, called mechanically operated or reed switches.
The other group of switches, without contacts, are called
solid state type (Ultraline solid state switches utilise GMR technology).
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