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Magnetic Proximity Sensors
Hall and Reed sensors, two types of magnetic proximity sensors, are most
commonly used for long-life position and presence sensing. Cherry offers a
wide range of Hall and Reed sensors.
Sensor Operation
A Reed Sensor is an omnipolar, magnetically activated switch. It can
be approached by a magnet from any angle and with either pole. Sev-
eral possible operating methods are shown below.
Different Designs
Hall and Reed sensors differ greatly in the way they function. A Hall sensor
is a solid-state device whose output changes when exposed to a magnetic
?eld. A Reed sensor, on the other hand, is electrically switched with tiny
contacts that open or close in the absence or presence of a magnetic ?eld.
Different Applications
Both types of sensors can be used for many similar applications, but there
also cases where one is clearly better than the other.
Unlimited Lifespan
Perpendicular magnet travel
S
Parallel magnet travel
Thanks to its almost unlimited lifespan, Hall sensors are ideal for geartooth
speed and rotary position sensing. Reed sensors cannot match the virtually
in?nite life of a Hall sensor.
operate
N
release
S
Energy Ef?ciency
N
Reed Sensors have zero power consumption in stand-by mode and are,
thus, very energy ef?cient. In addition, they are immune to ESD. Reed sen-
sors are also frequently used for applications with supply voltages outside
the typical 5 V DC to 24 V DC range of Hall sensors. They can effectively
switch 110 V ACac at low current.
Reed Sensors
Cherry offers Reed sensors in different contact con?gurations:
This method maximizes air gap
Nose-to-nose activation
Up to three operations
possible with one magnet
Rotational magnet travel
Normally open (Form A)
This sensor is normally open in the absence of a
release
operate
magnetic ?eld, and closed near a magnetic ?eld
Normally closed (Form B) This sensor is closed in the absence of a magnetic
?eld, and open near a magnetic ?eld
operate
N
S
release
operate
Changeover (Form C)
This sensor has three leads representing the nor-
mally open, normally closed and common contacts.
S
It is a "changeover" device because the common
contact changes from the normally closed to the nor-
N
release
mally open position when a magnetic ?eld is nearby
Magnetic Poles
Most solid-state sensors of our standard product line are south-pole sensi-
Both ends of the magnet
work equally well
Multi-pole ring magnets
can be used to achieve
a larger number of
operations per rotation
tive. Exceptions: the bipolar latching sensors MP101303 and MP101304,
which are latched with a south pole and unlatched with a north pole. The
MP1021 series includes both north pole-sensitive devices and latching de-
vices. All of our Reed sensors (MP2007 through MP2019) are omnipolar
Airgap (Distance Sensor – Magnet)
The ?eld strength at various points around a permanent magnet is de-
pendent on several factors, including the shape, size and material of the
magnet. Our bipolar latching sensors MP101303 and MP102104 have
relatively low gauss thresholds, allowing for somewhat wider airgaps.
Switching Hysteresis
The switching hysteresis is determined by the difference between the
sensing face and magnet detection distance as well as the sensing face
and magnet release distance.
25
Speci?cations subject to change without notice.
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相关PDF资料
SDP8407-001
PHOTOTRANSISTR SILICON NPN
SDP8436-004
PHOTOTRANSISTOR SILICON NPN T-1
SDP8476-201
PHOTOTRANSISTOR NPN SIDE LOOK
SE2460-002
DIODE IR EMITTING GAAS PILL PACK
SFP-1GBT-05
OPTO FIBER OPTIC TRANSCEIVER
SFP-1GBT-06
OPTO FIBER OPTIC TRANSCEIVER
SFP9530
MOSFET P-CH 100V 10.5A TO-220
SFT1341-E
MOSFET P-CH 40V 10A TP
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