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Environmental conditions

Indoor use

IP40 (MCUlite-2 and MCU5)

IP31 (MCU W)


Up to 2000 m

Operating temperature

+5 °C to +40 °C

Storage temperature

-25 °C to +70 °C (MCUlite-2 and MCU5)

-20 °C to +60 °C (MCU W *)

Relative humidity

Relative humidity 80% maximum (non-condensing) for temperatures up to +31 °C.

Linear decrease to 50% at +40 °C

Pollution degree

Pollution degree 2 as defined by BS EN 61010-1:2001 section

Normally only non-conductive pollution occurs. Occasionally, however, temporary conduction caused by condensation occurs.

* Storing the MCU W battery at high temperatures is not recommended because it prematurely ages the battery. The maximum recommended times for storage of the MCU W battery are:

  • 1 week at +60 °C
  • 1 month at +45 °C
  • 6 months at +40 °C
  • 12 months at +35 °C