Could RFID Enable a Temperature-Triggered Circuit to Open?

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Ask The ExpertsCategory: QuestionsCould RFID Enable a Temperature-Triggered Circuit to Open?
Amanda McCann asked 2 weeks ago
I am working on a project for the University of Minnesota. We are trying to develop a system with passive RFID that would be connected to a temperature-triggered circuit that would open once a threshold temperature has been reached. The tag and the circuit would be in a ceramic box together to protect them from the heat. I need some help finding a tag that can survive 200 degrees Celsius for 30 minutes, and a way to interface or connect the circuit to the tag so that it can be read when the circuit has been broken. For the circuit, imagine a fixed rod laying on top of a pinned rod, which would be supported by a material designed to melt at the threshold temperature. Thank you for any help.

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Amanda,

I discussed your project with the folks at HID Global and came up with some good recommendations. First, try using one of the standard seal tags on the market—they suggested their HID Seal Tag edTemper, though there are others available—and replace or extend the loop by your loop. To make this work, the loop must be made from conductive material. Next, you’ll have to tackle the housing material. If the tag is not specified for 200 degrees Celsius for 30 minutes, you’ll need to remove the original housing and put the electronics inside your ceramics. This would alter the tag’s read-range characteristics. As you may have discovered, standard RFID chips cannot be read at 200 degrees. Most will survive that temperature for 30 minutes, but to read them you would need to cool them to about 85 to 130 degrees. Good luck on your project.

Claire Swedberg
Senior Editor
RFID Journal

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