RFID temperature sensor needs no battery

March 27, 2014 // By Christoph Hammerschmidt
Condition-based maintenance is rapidly becoming state of the art since it helps users to save money. Instead of a rigid schedule with fixed maintenance date, machines and equipment only are maintained if the sensors indicate a necessity. The battery-free Pyros-TGT2-DWB RFID sensor tag from Spanish manufacturer Farsens is addressing the needs of cost-conscious operators.

The Pyros tag needs neither wiring nor batteries. This makes it perfect for applications such as rotary parts monitoring (i.e.: rotor temperature monitoring in engines) or asset monitoring in the railway and automotive industry (monitoring temperature variations of key assets while in operation).

The device can be used without batteries at all, allowing for a wide range of opportunities monitoring 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 sensor tag transmits a unique identifier and the associated temperature measurement data to a commercial EPC C1G2 reader. The device features a 103GT-2 NTC thermistor (10K) from Semitec with a measurement range from -10°C to +120°C with an accuracy of ±0.5°C. It also offers an extended temperature range from -30°C to +300°C with an accuracy of ±3°C. RFID tag operation range is -30°C to +85°C.

The tag is available with a variety of antenna designs and sizes to adapt the performance to the required application in the 860 to 960 MHz band. The reading distance for the battery-free thermistor tag is around 1.5 meters (5 feet) 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.