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Sensors • Magnetic Sensors

Actuated by a magnet and designed to detect the direction and magnitude of external magnetic fields, a magnetic sensors are used in truck transmissions, heavy duty off-road equipment, power take-off shafts, railroad axles, and glass processing equipment.Magnetic sensor types include magnetic proximity sensors, speed sensors, rotary position sensors, limit sensors, and direction sensors. Magnetic speed sensors are used to sense the approach of ferrous metal targets like gear teeth, fan blades, rotor blades, and wheel spokes; while noncontact magnetic sensors are found within industrial, agricultural, solar energy, and wind turbine applications.

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  • Euchner-USA, Inc.

    Euchner-USA offers magnetic sensors for a variety of applications. Inductive single and multiple limit switches are non-contact sensors that control and monitor machinery and industrial equipment, and actuate only upon detection of metal. Two operating voltages are available: 10-55 VDC and 20-250 VAC.

  • Marsh Electronics, Inc.

    Marsh Electronics offers a variety of magnetic sensors. The MP1001 Series magnetic position sensors have electrical immunity protection and are compatible with unregulated power supplies.  Hall-based magnetic proximity sensors include the MP1014 Series in low-profile, flange-mount housing, MP1005-MP1007 Series in adjustable, threaded housing, and MP1013 Series in snap-fit mounting.

  • Smith Systems, Inc.

    Smith Systems offers its Digi-Tran Series of active magnetic sensors and zero speed sensors for truck transmissions, heavy duty off-road equipment and power take-off shafts, railroad axles, and glass processing equipment. Nine models of magnetic sensors are available, each with high vibration noise immunity.

  • SICK, Inc.

    SICK manufactures magnetic proximity sensors and magnetic cylinder sensors. Proximity sensors are available in both cylindrical (MM) and square (MQ) configurations, with a maximum sensing range of 120 mm. Cylinder sensors are available in T-slot, C-slot, and other configurations.

  • VectorNav Technologies

    VectorNav Technologies makes the VN-100, an orientation sensor that combines a 3-axis accelerometer, 3-axis gyro, 3-axis magnetometers, and a 32-bit processor. The unit comes fully calibrated for bias, gain, and misalignment, and is thus able to calculate orientation accurately over a 360-degree range at 200 Hz.

  • Balluff, Inc.

    Balluff offers a variety of magnetic sensors, starting with inductive proximity sensors. These products emit alternating electro-magnetic sensing fields that trigger upon entrance of a metal target. Housing styles include standard and mini tubular and block styles, as well as cylinders  and large housings. The company also produces inductive distance sensors with Sn ranges from 2 mm to 50 mm, as well as magnetic field sensors that use magneto-resistive technology to detect piston magnets through the aluminum walls of pneumatic cylinders.

  • CHERRY/ZF Electronics Corporation

    CHERRY's MP Series magnetic proximity sensors are designed to meet the needs of OEM customers. Available in a variety of flange-mount, threaded, and snap-fit configurations. Economical reed sensors provide long life with micro-processor-compatible, hermetically sealed contact switching.

  • Honeywell Sensing and Control

    Honeywell's magnetic sensing line is based on anisotropic magnetoresistive thin film technology, and includes magnetic sensors, magnetometers, compasses, and dead reckoning modules. Applications include compassing in passenger cars, cell phones and handheld GPS receivers, and aircraft, marine, and personal navigation. Products include the HMR2300 Smart Digital Magnetometer, which features low magnetic field sensitivity (<70 micro-Gauss, <7 nano-Tesla) and both static and alternating field measurements up to 5 MHz, as well as linear and angular position sensors capable of measuring the angle direction of a magnetic field from a magnet with <0.07-degree resolution.

  • Yaskawa Electric America

    Yaskawa offers a range of magnetic sensors, featuring the dustproof, flood-tight Bestact magnetic proximity switch. These switches utilize  Bestact logic and inductive rated (0.5 and 0.125 Hp) reed switches for locations up to 510 degrees Fahrenheit, with sensing distances up to 4.33". They can also handle corrosive, dirty, extreme temperature, and gaseous Class I, Division II hazardous location environments.

  • Infineon Technologies North America Corporation

    Infineon magnetic sensors are split into three subcategories: rotational speed sensors, Hall-effect switches, and position and current sensing. Rotational speed sensors are used in automotive applications like ABS, transmission management, and engine management, and available for 2- or 3-wire interfaces, as well as with or without direction detection and/or vibration suppression. The Hall switches are unipolar and omnipolar switches and bipolar latches that cover a wide range of applications, from position sensing to index counting. Features include voltage interface, 2-wire current interface, double latch for speed and rotation direction detection, and more. Finally, position and current sensing products start with linear Hall sensors, and end with GMR-based 360-degree angle sensors.

  • Motion Sensors, Inc.

    Motion Sensors Inc. carries magnetic speed sensors that sense the approach of ferrous metal targets like gear teeth, fan blades, rotor blades, wheel spokes, etc. Designs include variable reluctance (VR), amplified magnetic speed , and Hall effect sensors (i.e., magnetoresistive). The company specializes in VR sensors, which are offered four types. The least expensive are Value Series epoxy encapsulated VR speed sensors, which offer welded connectors, stainless steel fronts, and operation up to 450 degrees Fahrenheit; Premium Series VR sensors, which are resistant to electrical noise interference, for use in cryogenics and other sever environments; Premium Series high temperature VR sensors that have an operational range of -450 to +850 degrees Fahrenheit continuous; and Value or Premium Series amplified VR speed sensors that offer near-zero velocity (2 Hz) speed sensing, large air gap capability, and several digital output options.

  • Nve Corp.

    NVE Corporation offers an array of magnetic sensor options. Within their product line are medical sensors, which are solid-state components as small as 1 mm2, sensitive to magnetic fields as low as 1 Oe (0.1 mT). Also available are GT Sensors designed for detection of gear teeth and magnetic encoder wheels for industrial speed sensing; they provide a 50% duty cycle output with wide airgap and temperature tolerances, as well as low profile packages. A host of other magnetic sensors are available, as well, such as analog sensors, digital sensors, and current sensors.

  • Omron Electronic Components

    The GLS magnetic proximity sensor is available from Omron. With a permanent magnet used to operate the reed switch, the sensor is ideal for detecting opening and closing doors. The GLS has a 15 mm sensing distance, ambient temperature range from -20 to +60 degrees Celsius, and ambient humidity range of 35% to 85% (with no condensation).

  • Electro-Sensors, Inc.

    Electro-Sensors is a supplier of hazard monitoring systems and machine monitoring sensors for industrial applications. Available products incldue magneto resistive sensors with features include non-contact sensing, NPN open collector outpu, large sensing gap, 8-24Vdc operation and PLC Digital I/O compatibility.

  • Phoenix America Inc.

    Phoenix America carries magnetic speed sensors and magnetic proximity sensors. The former can be used to determine rotational speeds from 0 to 100 kHz with very high resolution, and in almost all industrial environments (e.g., dirt, grease, water splashes, etc.). They come magnet-actuated, gear-actuated, or variable reluctance. With similar environmental tolerances, proximity sensors determine the location or passage of a target moving up to 100 kHz with rapid response times. Operation methods include permanent magnet-, ferrous material-, and inductive material-actuation.

  • Sensor Solutions

    Sensor Solutions manufactures non-contact magnetic sensors for the industrial, agricultural, solar energy, wind turbine, and related markets. They offer single-channel gear tooth speed sensors that use Hall effect technology to produce a digital output as gear teeth pass by the sensor, and Hall switch sensors and magnetoresistive switch sensors to determine linear and rotational speed, as well as direction and position, of targets. Single-channel target tracker gear tooth sensors, which send digital pulses in the presence of metal without the rotational alignment of a Hall effect sensor, can be used to determine speed on bolt heads, holes in gears, etc. In addition to these three options, Sensor Solutions offers more than a dozen others, include quadrature 2-channel gear tooth sensors, speed direction gear tooth sensors, speed direction quad gear tooth sensors, dual output Hall switch sensors, Hall latch sensors, and digital and analog ferrous metal detection sensors.

  • Sensoronix, Inc.

    Using both Hall effect and variable reluctance technologies, Sensoronix magnetic sensors provide a range of sensor solutions to measure speed, direction, position, and proximity. Their basic Hall effect zero speed sensors provide digital output with constant amplitude signal, regardless of speed variation. With an airgap from 0.005" to 0.120", it measures a speed range from 0 to 15 KHz (20 KHz optional). The digital proximity sensor comes with sinking NPN or sourcing PNP output; its magnetic release point is 140 Gauss Nom. and its magnetic operate point is 180 Gauss Nom. Two Hall effect linear position sensors are also available at 0 to 5 VDC and 0 to 10 VDC, as well as analog speed sensors (sine wave), analog to digital converter speed sensors, and analog complimentary variable reluctance speed sensors (dual sine wave).

  • TTI Inc.

    TTI carries Honeywell magnetic speed and position sensors that use Hall effect, magnetoresistive, and variable reluctance technology. Available speed sensors start with the 1GT gear tooth sensor with an operating speed >100 KHz for sensing ferrous metal targets, and end with the SNDJ Series, T4C double Hall effect sensor, which has a 1.5 mm sensing range and two back-biased Hall effect ICs that are zero-speed capable for use as a proximity switch. Position sensors include the bipolar Hall effect SS30AT, which offers reverse polarity protection and stable output over a -40 to +125 degree Celsius temperature range; unipolar Hall effect 103SR for position and RPM sensing in non-corrosive applications; and omnipolar magnetoresistive 2SS52M, which offers digital output in response to very low magnetic fields.

  • Spectec

    Variable reluctance speed sensors are available from Spectec, with frequency ranges >100 kHz and temperature ranges from -450 to +850 degrees Fahrenheit. Air gaps between the speed sensor and target for magnet types is 0.001" to 0.003", and 1" max for inductive types. Specialized units are also available, such as those that are intrinsically safe to zone 0, dual output, or hermetically-sealed and sanitary. Typical applications for these sensors include ATV tachometer sensors; truck, railroad, and marine transmissions; wheel slip and traction control in ABS brake systems; are more. Typical targets are slotted wheels, sprockets, and bolted heads.

  • C & A Tranducers Inc

    C&A Transducers Inc. specializes in custom design and manufacturing of solutions for the aerospace and commercial industries, including variable reluctance magnetic speed sensors, Hall effect sensors, and digital speed sensors. Magnetic speed sensors come in a variety of styles, from general purpose (85 ohm max resistance, 25 mh max inductance) to high sensitivity (1,200 ohm max resistance, 450 mh max inductance). Other options and styles are blind end, full thread aluminum, miniature, and low cost. The company's sensors have been used in a variety of space, aircraft, and commercial projects, including magnetic pickups in the water separator of the lunar excursion module, temperature probes on the Nimbus weather satellite, and magnetic pickups in J-2 engines and emergency power units.