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 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.

Cherry Corp. specializes in the production of magnetic proximity sensors, speed sensors, and rotary position sensors to meet the needs of OEM customers. Magnetic options include the MP2007 Series reed sensor that is omnipolar and can therefore be approached by a magnet from any angle, with an operate time of either 0.6 or 1 ms; the DS1101 Series solid state button-actuated sensor that uses Hall effect technology; and the VN1015 Series magnetically-activated digital vane switch that comes in an overmolded plastic housing with either 3-pin or 3-wire harness termination.

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. 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 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.

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 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.

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 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.

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 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.

Electro-Numerics offers variable reluctance, Hall effect, and zero speed proximity magnetic sensors in standard and custom designs. Their ruggedized sensor line includes stainless steel housing, blind end construction, and 300 degree Fahrenheit epoxy encapsulation, and are rated for shock and vibration. The commercial sensor line comes with a choice of housing materials (stainless steel, brass, or plastic), and pole diameter sizes from 0.25" to 0.625".

Governors America Corp. provides magnetic speed sensors for the detection of ring gear teeth and other ferrous projections.  With a variety of dimensions, these sensors offer 0.025" to 0.035" proximity to gear teeth, -65 to +225 degree Fahrenheit temperature range, 0.5 to 30 V RMS output, and 30 to 1,200 ohm resistance, depending on the sensor.