Wireless temperature and humidity loggers are used to measure both temperature and humidity in places which require constant monitoring of the prevailing conditions – museums, archives or churches to monitor atmospheric conditions affecting exhibits.

Efento NB-IoT sensors transmit the data over cellular network (Narrowband IoT) and do not require any additional devices (router, gateway, etc.). Sensors are also equipped with Bluetooth Low Energy interface, which allows quick and easy configuration with a smartphone. Efento NB-IoT sensors can be integrated with any cloud platform.

TEMPERATURE SENSOR
Range: -35° to 70°C
Accuracy up to 0.25°C in the -20°C to +70°C range and 0.5°C in the -35°C to -20°C range
Resolution: 0.1°C
Drift: -0.1°C / year
Measurement interval: 1 minute to 10 days, configurable
Memory size: 60 000 measurements

HUMIDITY SENSOR
Range: 0 to 99% RH
Accuracy: 4% in 0 to 80% RH, 7% in 81 to 99% RH
Resolution: 1%
Drift: -0.25% / year
Measurement interval: 1 minute to 10 days, configurable
Memory size: 60 000 measurements

NB-IoT
NB-IoT band: 1, 2, 3, 4, 5, 8, 12, 13, 17, 18, 19, 20, 25, 28, 66
3GPP: Release 13
Power: 20 dBm

BLUETOOTH LE
Communication: Bluetooth Low Energy (BLE)
Radio module frequency: 2,4 GHz
Power: 2,5 mW (4 dBm)
Range: up to 100 m (LOS)
Transmision period: 1 s

COMMUNICATION
Protocol: CoAP; Transmission interval: 5 minutes – 10 days, configurable

SOFTWARE UPDATES
Over the air (with delta mechanism); Over Bluetooth Low Energy

POWER SUPPLY
Replaceable AA batteries 2 x AA,
4200 mAh or 3 x AA, 6300 mAh.
Battery operating time: up to 10 years
USB 5V with 1000 mAh rechargeable battery