Choose another country or region to see content specific to your location.

Product at a glance

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.


  • 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


Purpose of control Electronic temperature and humidity sensor (independently mounted)
Supply 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 Z-Wave
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 ±3%
Dimensions 85 mm x 85 mm x 30 mm
Weight 0.2 kg (approx.)
Case material Flame-retardant thermoplastic
Ball pressure test temperature 75˚C
Mounting Wall mounting, using a single-wall wall box (not supplied)
Enclosure protection IP30
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