• Protect mechanical plants


    • Ensure efficient operation


    • Predictive maintenance


    • Monitor electric motors


    • Monitor HVAC efficiency


    • Monitor AC switchgear




    • Normal temperature range
      -40 °C to +85 °C


    • High-temperature alarm
      up to +145 °C


    • Powered by Magnus® S3


    • Sensor size
      25.4 x 9.1 x 3.2 mm


    • Battery-free design


    • Adhesive backing


Battery-free equipment monitoring

The RFM3250 is built with wireless Smart Passive Sensing™ technology that forms a battery-free and maintenance-free temperature sensor. This rugged sensor is designed to monitor mechanical plant and equipment temperatures in the harsh and extreme environments common in industrial settings. Typical applications include electric motor protection, bearing temperature monitoring, heating and cooling equipment (HVAC) efficiency monitoring, switchgear and other applications where metal surfaces are common.

Wireless temperature sensing

The RFM3250 has a normal operating temperature range of -40°C to +85 °C. This covers the typical operating temperatures of most equipment over a range of environmental operating conditions. The RFM3250 reports temperatures beyond its normal operating range to as high as +145 °C, although prolonged operation at such an elevated temperature is not recommended.

Rugged design for use on-metal

The RFM3250 is built with a robust composite antenna and is ideal for harsh environments subject to temperature extremes and the elements. The integrated RF antenna harvests energy for the temperature sensing function, as well as communicates with a RAIN/UHF compliant reader. The integrated antenna is suitable for use on metal surfaces that might otherwise adversely affect wireless/RF communication range.


The RFM3250 is available in FCC and EU/ETSI frequency ranges. The RFM3250 requires a RAIN/UHF compliant reader. These sensors can be purchased separately or as part of a kit.


Purchase RFM3250 Rugged Wireless Temperature Sensors

ORDER: RFM3250-BFS for FCC version or RFM3250-BES for EU/ETSI
Taxes and shipping will be added


Pack of 5: Price: US $97.25
Pack of 25: Price: US $486.25
Pack of 100: Price: US $1,887
Pack of 300: Price: US $5,661.00