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Magnetic Sensors - Switches (Solid State)

Magnetic sensors, commonly known as switches, are momentary sensors that detect magnetic fields. They are commonly used as a means of detecting the presence of a magnet, or to detect when a magnet is moved to a certain location and activate a switch accordingly. Solid state switches are desirable over mechanical switches because they are much more reliable, and can be used in much harsher environments.The AS-M15SA-R is a solid state magnetic switch used to detect the presence of a magnetic field.

AS-M15SA-R Application Field

The AS-M15SA-R is a low cost, small form factor switch, that is highly suited for applications where low power consumption, long service life, and high reliability are paramount. It is ideal for use in safety circuits, such as those used in manufacturing equipment or medical applications. Its solid state construction makes it suitable for harsh environments, such as extreme temperatures, dusty, wet, or corrosive atmospheres.

The AS-M15SA-R is ideal for applications from medium to low sensitivity magnetic field measurements, making it a great choice for proximity sensing of low-field magnetic fields. This makes it suitable for use as part of an auto-initiated system, such as a robotic arm, or in code-reading applications. Other potential applications may include liquid level sensors or load sensing equipment.

AS-M15SA-R Working Principle

The AS-M15SA-R is a Hall Effect switch, which means that it utilizes the Hall Effect to detect a magnetic field. The Hall Effect was discovered by Edwin Hall in 1879, and occurs when a conductive material, in this case a semiconductor, is placed in a perpendicular magnetic field. When this occurs, a voltage potential, known as the Hall Voltage, proportional to the strength of the field is generated.

In the AS-M15SA-R, this voltage potential is detected by a circuit equipped with a comparator, which triggers an output for the switch when a certain threshold is reached. This helps to keep the sensitivity of the switch very consistent, so that it can be reliably used for applications such as proximity sensing.

The AS-M15SA-R is available in two sensitivity variants – the low-sensitivity switches can detect the presence of a magnetic field at up to 0.4 Gauss, while the higher sensitivity switches can go up to 1.2 Gauss. The output of the switch can also be programmed, offering the flexibility to customise the action of the switch according to the application.

Conclusion

The AS-M15SA-R is a solid state, low cost, and small form factor switch designed for applications with low power consumption, long service life, and high reliability. Its Hall Effect-based design makes it ideal for applications such as proximity sensing, liquid level sensing, or load sensing. It is also available in two different sensitivity levels and is highly programmable for flexible control.

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