MG Series Magnets
The MG Series magnets offered by Honeywell Sensing and Control includes several bar magnets in various
sizes and strengths for actuating Hall-effect and magnetoresistive sensor ICs. These bar magnets are for
use in sensors with unipolar or omnipolar magnetic characteristics.
Made from different magnetic materials and available in a variety of sizes and shapes, the MG Series
magnets can be used for evaluation and design of magnetic systems, and in numerous potential
applications across a variety of different industries. Some of these magnets are offered with threaded
bushings for easy installation and have a good resistance to demagnetization which could be caused by
magnetic shock. These magnets are designed to provide minimum magnetic fields at a specified distance
to help system designers match the appropriate magnet to their requirements.
Value to the Customer
Variety of sizes, shapes, and packaging options
to choose from
The MG Series consists of a range of magnets based on varying
dimensions and packaging types to help customers identify the
most appropriate magnet that can be used to evaluate Honeywell’s
Hall-effect and magnetoresistive sensor ICs in their applications.
DID YOU KNOW?
Magnetic sensing characteristics of Hall-effect sensor ICs are specified within
particular ranges.
For example, assume an application with a temperature range of -40 °C to 125 °C
[-40 °F to 257 °F] using an SS443A. The operate point may be up to 215 Gauss [21.5 mT]
and the release point may be 60 Gauss to 190 Gauss [6.0 mT to 19.0 mT]. To ensure
reliable operation, at least 215 Gauss [21.5 mT] must be presented to the sensor. For a
robust activation, the flux from the magnet at the maximum operating gap should be 20
% to 100 % higher than the sensor’s maximum operating point over temperature. The
Gauss level must then be reduced below 60 Gauss [6.0 mT] to ensure that the sensor will
release.
Therefore, it is necessary to know the flux density (Gauss) measured at the chip to be
able to:
• Select a device with the best magnetic characteristics for the application
• Select the best magnet
• Verify the desired mechanical characteristics
COMPACT SIZE • WIDE RANGE • VARIETY OF SHAPES
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Features
and Benefits
PHYSICAL STRENGTH
The MG Series offers Alnico or Indox magnets which exhibit good physical strength.
MAGNETIC FIELD
Rare Earth (SmCo-Samarium Cobalt) magnets from MG Series offer strong magnetic field
in compact sizes.
Choose the best fit option
MAGNETIC MATERIAL
Honeywell’s MG Series offer magnets made from different magnetic materials allowing
customers to choose the most suitable option for their application.
OPERATING TEMPERATURE
The MG Series magnets exhibit good stability over a wide range of operating temperatures,
as low as -40 °C [-40 °F] or as high as 140 °C [284 °F] to 300 °C [572 °F], depending on
the magnet.
OPERATING MAGNETIC GAUSS LEVELS
The MG Series offers a wide selection of magnets operating across various magnetic Gauss
levels to choose from.
Potential Applications
These magnets are used as actuators for Hall-effect and magnetoresistive sensor ICs which
in turn can be used in a number of potential industrial and medical applications.
INDUSTRIAL
• Door or lid closure detection in appliances or electronically controlled containers
The unipolar sensor recessed in the door frame with a magnet embedded in the door
can help in sensing the open and close positions in doors or lids in appliances or
electronically controlled containers.
• Simple speed and RPM (revolutions per minute) sensing in fitness and industrial
equipment
A single magnet of appropriate polarity mounted on the motor shaft of a treadmill when
actuates a unipolar Hall-effect sensor IC generates single digital pulse for each revolution
which in turn can help measure the speed or RPM of the equipment.
MEDICAL
• Position sensor in hospital beds and medical equipment
Magnets can be used to determine the home or end-of-travel position of the equipment
on an activator arm of hospital beds and medical equipment.
• Medication bin monitor on portable drug carts
These magnets can be mounted on a drug dispensing drawer to detect the open or
close position using a unipolar Hall-effect sensor IC.
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