How can I use RFID technology to monitor items being stored?
The tags you can use would depend on how cold the refrigerator or freezer is. Tag chips typically work at temperatures as low as -40 degrees Celsius (-40 degrees Fahrenheit). So as long as your storage unit is not colder than that number, almost any passive high-frequency (HF) or ultrahigh-frequency (UHF) transponder will work (check the chip’s specifications before you buy it).
Tags can operate at much colder temperatures, provided they are protected from the elements. I know that Wake Forest Baptist Health is using Omni-ID‘s passive UHF FIT 200 tags on specimen containers stores at cryogenic temperatures of -196 degrees Celsius (-321 degrees Fahrenheit). The tags, attached using ITW Devcon adhesive, are small and have a short read range, but can be interrogated even while submersed in liquid nitrogen.
—Mark Roberti, Founder and Editor, RFID Journal
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