What are the key points in distinguishing AMR sensors from reed switches?
Reed switches have mechanical contacts, and so the contacts have a limited lifespan, and they are sensitive to impact and vibrations.
(Have you ever had reed switches that failed to work after product delivery? They may have been affected by a strong impact during transportation or when mounting.)
AMR sensors have a higher impact durability than reed switches, have a smaller size, and when the magnet position cannot be changed significantly, the AMR sensor can be turned off by the direction of the magnetic force lines.
This can be used for applications in switches with extremely short strokes and in rotation detection.
Also, because the magnetic field detection direction is the same as reed switches, magnets that were used in reed switches may be able to be used without modification in AMR sensors in some cases.
*The Simulation Tool can be used to conduct a general check of whether the sensor will operate using the same magnet.
In contrast to reed switches, AMR sensors include built-in switching circuits, and a power supply is required to operate the sensors. Be aware that AMR sensors may have different numbers of wires and current consumptions.
For details, see Differences Between AMR Sensor (Magnetic Switches) and Other Systems