SES303 is a wireless sensor that measures both indoor air temperature and humidity. It is powered by two AA batteries and is Z-Wave Plus certified. It can be used as a standalone measuring device, and can also be used with the following external temperature sensors:

  1. One external NTC wired temperature sensor (SES001) 
  2. Up to four external wired pipe/tank temperature sensors (SES002, 1-metre cable) 
  3. One external wired pipe/tank temperature sensor (SES003, 4-metre cable)

SES303 is ideal for smart home systems, as well as large-scale metering systems.



  • Metering network

    A large scale metering network can be set up using a number of SES303 units together with a Z-Wave controller. A controller placed centrally can collectdata from SES303 units placed around a building, and then pass the data to the backend system.

    The sensors are battery powered, so installation is quick and easy. Long battery life makes SES303 ideal for suchapplications.

  • Key Feature

    • Accurate measurement of temperature and humidity
    • Z-Wave Plus™ certified
    • Unique serial numbers reported over Z-Wave
      • Suitable for large metering networks
    • Configurable data reporting interval and Delta change of temperature
    • Low battery alarm
    • Pushbutton for easy network inclusion/exclusion
    • Specification
    • Electrical

      Purpose of control

      Electronic temperature and humidity sensor (independently mounted)


      3 V DC (2 x AA alkaline batteries)

      Battery life

      >2 years (using on-board sensor and 4 external sensors, with the default configuration)

      Software Class

      Class A


      Mesh radio type


      Operating frequency

      868.42 MHz (EU)

      921.42 MHz (ANZ)

      Receiver Category

      Category 3

      Power Class

      Class B

      RF Range

      ≥100 m, line of sight



      Temperature range

      0 °C to +40 °C

      Temperature accuracy

      ± 0.5 °C

      Relative humidity range

      20% to 80%

      Relative humidity accuracy




      85 mm x 85 mm x 30 mm


      0.2 kg (approx.)

      Case material

      Flame-retardant thermoplastic

      Ball pressure test temperature

      75 ˚C


      Wall mounting, using a single-wall wall box (not supplied)


      Enclosure protection


      Pollution Degree

      Degree 2

      Operating temperature range

      0 ˚C to +40 ˚C

      Storage temperature range

      -20 °C to 55 °C

      Humidity (relative)

      0% to 95%

      Atmospheric pressure

      980 hPA to 1035 hPa