Flex2-T-RH LWEU/LWNA temperature and humidity transmitter

The Flex2 series is a multipurpose weatherproof LoRaWAN transmitter series with several input options for various needs of industrial measurement and monitoring. The LoRaWAN radio offers a long range, especially outdoors, and connectivity to all standard LoRaWAN systems. Compare the Flex devices.

Flex2-T-RH LWEU/LWNA measures the ambient temperature and relative humidity with a polymer sensor in the protruding black part.

The device consists of two parts, a measuring part and a radio part.

Product code measuring part: 20639

Product code radio part Europe: 21607
Product code device Europe: 21483

Product code radio part USA and Canada: 20648
Product code device USA and Canada: 20659

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User manual and brochure


  • Operating temperature: -30…+60 °C
  • Operating humidity: 0-100 %RH
  • Protection class: IP65
  • Enclosure material: Plastic (PC+ABS)


  • Weight:
    Radio modules: 35g
    Measurement modules: 70g (slight variation between Flex2 models)
  • Dimensions: Width 60 mm, depth 32.5 mm, height: 212.8 mm
  • Cable gland: M12x1.5

Power supply

  • Batteries: 3.6V Lithium Thionyl battery pack
  • Typical battery life:
    With a good radio link and 5 min measurement interval, typically 5 years
    With an average radio link and 30 min measurement interval, typically 5 years
    With a bad radio link and 30 min measurement interval, typically 3 years

Measuring and data transmission

  • Measure interval: Configurable: 0…14400s
  • Radio: LoRa radio technology with Murata ABZ-093 LoRaWAN modem
  • Antenna: Internal
  • Frequency band: EU868: 863-870 MHz / US915: 902-928 MHz
  • Transmission power: Max +14 dBm E.R.P.
  • Range, line-of-sight: Depends on installation location and environment, in good conditions 10 km

T-RH module

  • Temperature sensor type: Semiconductor based internal sensor
  • Measurement range: -40…+125 °C
  • Accuracy: ±0.5 °C
  • Humidity sensor type: Capacitive polymer humidity sensor inside a sintered filter
  • Measurement range: 0…100 %RH
  • Total error band: ±5 %RH over 10…90 %RH and +5…+50 °C
  • Accuracy: Typically ±3 %RH over +0…+50 °C