Flex2-ES LWEU/LWNA temperature 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-ES LWEU/LWNA measures temperature with an external sensor connected to a spring-loaded connector inside the transmitter. The sensor is not supplied, but a thermocouple or a RTD sensor can be used.

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

Product code measuring part: 20640

Product code radio part Europe: 21607
Product code device Europe: 21479

Product code radio part USA and Canada: 20648
Product code device USA and Canada: 20660

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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: 197.3 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

ES module

  • Sensor type: RTD
    • Cable length: < 30 m
    • Measurement range: -200…+650°C
  • Accuracy: Accuracy 0.05% rdg + 0.2 °C at 25 °C ambient
    • Thermal drift: 0.01 °C/°C
    • Sensor type: Thermocouple
    • Cable length: < 30 m
    • Measurement range: mV: -30…2000mV
    • (Linearity error):
      TcB: 400…1700 °C (0.3 °C)
      TcC: 0…2300 °C (0.5 °C)
      TcD: 0…2300 °C (1 °C)
      TcE: -100…900 °C (0.2 °C)
      TcG: 1000…2300 °C (2 °C)
      TcJ: -160…950 °C (1 °C)
      TcK: -150…1370 °C (0.5 °C)
      TcL: -150…900 °C (0.5 °C)
      TcN: 0…1300 °C (0.1 °C)
      TcR: 0…1700 °C (0.5 °C)
      TcS: 0…1700 °C (0.5 °C)
      TcT: -200…400 °C (1 °C)
    • Accuracy: Typically ±1.0°C over +0…+100 °C