Hall Effect Speed Sensors

Hall Effect (HE) speed sensors are sometimes referred to as switches, as they switch on and off when the tooth of a gear passes across the sensor. Hall Effect Speed Sensors typically consist of three wires which are power, ground, and signal. HE sensors usually have one to two Hall Effect chips that are positioned on a magnet within the sensor and are in proximity to the ferrous target wheel. When the target wheel turns, the magnetic flux increases and creates Hall voltage, which in turn produces a square digital signal wave. The advantages of a Hall effect speed sensor are that they can still detect the target at a larger air gap and continue to produce a signal at zero speed, whereas a VR sensor cannot.

Hall Effect (HE) speed sensors are crucial components with diverse applications in engineering and technology. They function as highly sensitive switches, activating when a gear’s tooth passes by. These sensors consist of three primary wires: power, ground, and signal.

Within the sensor assembly, one to two Hall Effect chips are strategically positioned close to a magnet. These chips act as precise detectors, continuously monitoring the surrounding magnetic field. When a ferrous target wheel starts to rotate, it induces changes in the magnetic flux, leading to the generation of Hall voltage. This Hall voltage is then converted into a square digital signal wave, effectively encoding the occurrence of motion.

Hall Effect speed sensors boast remarkable capabilities, including exceptional air gap tolerance, allowing them to detect targets even when a considerable distance separates the sensor from the observed object. In contrast to Variable-Reluctance (VR) sensors, Hall Effect sensors continue to function flawlessly at low speeds and even when motion ceases entirely.

These sensors are unsung heroes in various engineering sectors, playing a pivotal role in monitoring and controlling motion and speed in numerous systems and industries. Their consistent and accurate data capture makes them indispensable tools for engineers, contributing to the design and maintenance of highly efficient, secure, and dependable systems.

Whether in manufacturing, aerospace, automotive technology, or other precision-critical fields, Hall Effect speed sensors are the silent guardians that ensure seamless operations. Their versatility and reliability make them essential for optimizing system performance, a fact recognized by engineers worldwide.

A sensor manufactured by Magnetic Sensors Corporation, featuring a Hall Effect sensor technology. The sensor is enclosed in a durable 303 stainless steel casing. It has a digital output and does not contain any moving parts or contacts. The sensor operates on a voltage range of 4.5 to 24Vdc and functions reliably in temperatures from -40°C to +125°C. With its rugged design and adaptable configuration, this versatile sensor is commonly utilized in applications such as engine governor/controls, transmission, diesel engines, hydraulic motors, turbines, and power generation.

Features

- True zero speed sensing
- Digital output
- No moving parts or contacts
- Supply Voltage from 4.5 – 24Vdc
- Operating Temp -40°C to + 125°C
- Wide variety of styles and sizes
- Rugged design
- Configurable for most environments
- Customized versions available
- Adapts to various configurations

Sizes Available
Tubular	.250″ to .500″ dia
UNF Thread	1/4-28 to 3/4-16
Metric Thread	M12X1.25 TO M22X1.5