Magnetic Sensing Solves Tamper Detection

“Wrap rage” is the common name for heightened levels of anger and frustration resulting from the inability to open packaging particularly some heat-sealed plastic blister packs and clamshells.   —WIKIPEDIA

We’ve all been there. Trying to get batteries out of those plastic cases is an unpleasant challenge, but you have to admit the packaging works. No one is walking out of the store with those batteries in their pockets.

In electronic tamper protection, you’re looking for the same level of security. According to Statista, the smart meter shipment worldwide is expected to grow to more than 30 million units shipped in North America, 44 million in Europe, and 122 million in Asia Pacific by 2024.

The key to this technology is the ability to discretely hide the magnet and sensor in the cover or lid of the safeguarded device. This also has the added benefit of keeping the device’s power consumption at a bare minimum during the storage period between manufacture and purchase.

These magnet-sensor solutions employ various technologies, including anisotropic magneto resistive (AMR), giant magneto resistive (GMR), Hall sensor technology, or tunnel magneto resistive (TMR.)

While AMR, GMR, and Hall struggle with low voltage output and temperature fluctuation, TMR has the inherent advantage of offering both extremely high magnetic sensitivity and less susceptibility to temperature change.

While some magnetic sensor companies feature TMR-based products, all solutions are far from equal. Crocus TMR sensors are based on XtremeSense® TMR technology, which provides ultra-low noise, and the highest accuracy, along with low power, temperature stability, and more efficient designs. Last, but not least, Crocus XtremeSense® TMR sensors’ high sensitivity means you can increase activation distances, and pair them with less expensive magnets, reducing product size and cost.


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