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Battery-free RFID Humidity, Temperature Sensor

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The Hygro-Fenix-H221 from Farsens S.L., San Sebastián, Spain, is a battery free RFID sensor tag capable of transmitting a unique identifier and the associated relative humidity and temperature measurement data to a commercial EPC C1G2 reader without the need of a battery on the sensor tag.

The device features an HTS-221 humidity sensor from ST Microelectronics with a measurement range from 20% to 80% rH with an accuracy approximate  of ±4.5 rH. It also offers temperature with an accuracy of ±1 C degrees in the range from 0 to 60 C degrees.

The tag comes in a variety of antenna designs and sizes to adapt the performance to the required application in the 860-960 MHz band. The reading distance for the battery-free thermistor tag is around 1.5 m (5 ft) and it can be embedded in a wide variety of materials such as plastics or concrete. It can also be encapsulated in an IP67 or IP68 casing for usage in harsh environments. Evaluation kits are available.

The HygroFenix can be used without batteries, allowing for a wide range of opportunities monitoring relative humidity and temperature in applications where the accessibility is restricted, or where the use of batteries is not recommended. Since batteries are not needed, the sensor tags will never have to worry about autonomy.

The fact that HygroFenix tags need neither wiring nor batteries makes them perfect for applications such as datacenter infrastructure management .

Source : Farsens S.L.

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