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Magnetic Proximity Sensors

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About Magnetic Proximity Sensors

Magnetic proximity sensors are noncontact proximity devices utilize inductance, Hall effect principles, variable reluctance or magneto resistive technology. Magnetic proximity sensors are characterized by the possibility of large switching distances, available from sensors with small dimensions. They detect magnetic objects (usually permanent magnets), which are used to trigger the switching process.  As the magnetic fields are able to pass through many non-magnetic materials, the switching process can also be triggered without the need for direct exposure to the target object. By using magnetic conductors (e.g., iron), the magnetic field can be transmitted over greater distances so that, for example, the signal can be carried away from high temperature areas.  The measurement of proximity, position and displacement of objects is essential in many different applications: valve position, level detection, process control, machine control, security etc. Proximity sensing is the technique of detecting the presence or absence of an object using a critical distance. A position sensor determines an object's coordinates (linear or angular) with respect to a reference, displacement means moving from one position to another for a specified distance (or angle). In effect, a proximity sensor is a threshold version of a position sensor.


Products & Services Related to Magnetic Proximity Sensors

Hall Effect Position Sensors
Hall effect position sensors are non-contact devices that convert energy from a magnetic field into an electrical signal. They use the Hall effect, a voltage caused by current-flow in the presence of a magnetic field.
Hall Effect Proximity Sensors
Hall effect proximity sensors are used to detect the proximity, presence or absence of a magnetic object using a critical distance.
Inductive Linear Position Sensors and Switches
Inductive linear position sensors and switches are noncontact devices that determine an object's coordinates (linear or angular) with respect to a reference.
Inductive Proximity Sensors
Inductive proximity sensors detect the presence or absence of an object using a critical distance.
Magnetic Speed Sensors
Magnetic speed sensors rely on a magnet as the sensing element or sensed target to capture rotational or linear speed. They are typically used as gear tooth speed sensors or incorporated into stroboscopes or tachometers.
Magnetoresistive Linear Position Sensors and Switches
Magnetoresistive linear position sensors and switches have a linear resistance output signal representing the distance an object is from a reference point.
Variable Resistance Linear Position Sensors and Switches
Variable reluctance linear position sensors and switches are noncontact devices that use variable reluctance based technology, and whose output signal represents the distance between an object and a reference point.

Engineering Web: Magnetic Proximity Sensors - Machine Design

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