Magnetic Speed Sensors
Magnetic Sensor Signal Conditioners
Magnetic Speed Sensor Specs
- Frequency range: to above 100 kHz
- Temperature ranges: Standard & Extended, High temp & cryogenic sensors, -450 to 850° F (-270 to 454° C)
- Air Gaps:
Magnet speed sensors: Recommended air gap between the magnetic sensor and the target is 0.005" to 0.015" typical, air gaps up to .25" are possible depending on target velocity and mass
Inductive speed sensors: 1” max depending on magnetic field strength
- Shock and vibration resistant - reliable in oily, wet and harsh environments;
- Sensor sizes: popular standard and metric thread and diameter sizes
- Shell Material: 303 Stainless Steel; other materials available
Magnetic Speed Sensor Applications:
SPECTEC's magnetic speed pickups are sensitive, yet very reliable in harsh speed sensing environments that require shock-proof sensors. Applications of magnetic sensors are in wheel speed sensor, vehicle speed sensor, counting and position sensing in industrial applications, such as on conveyer belts.
Magnetic sensors are used with targets such as: slotted wheels, sprockets, and bolt heads.
Other applications for magnetic speed sensors is as ATV tachometer sensors; vehicle speed sensors, truck transmission and ABS sensors, locomotive traction sensors, and marine transmissions; in ABS brake systems for wheel slip and traction control; construction equipment transmission and tachometer applications; and in vehicles for engine RPM, speed and automatic transmission sensors.
SPECTEC magnetic speed sensors are used as high temperature race car sensors, applications on pipelines and oil fields around the world, OEM replacement locomotive traction sensors on commuter railroads, as well as in the moist, corrosive and noisy electrical environments of ships at sea.
Contact us for your custom magnetic speed sensors needs.
Magnetic Speed Sensor Principles of Operation:
The signal output of a magnetic speed sensor is caused by the excitation of its inductive coil by a passing target. As a ferrous actuator, such as a wheel's gear or a turbine's blade, moves past the magnetic sensor, the actuator's surface discontinuity (i.e. a gear tooth) excites a voltage in the pickoff coil, producing an electrical analog wave.
The frequency and voltage of the analog signal is proportional to actuator velocity (like an AC-generator). Each passing discontinuity in the target causes the magnetic sensor to generate a pulse.
The cyclical pulse train created by a vehicle's rotating gear, a flow meter's turbine blade or a cotter key slot can be read by counters, meters or governing instrumentation.