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 sensors transmit the data over cellular network (Narrowband IoT and LTE-M) 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 / LTE-M 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

LTE band (FDD)
LTE band (FDD): 8, 20, devices working on other bands available on request
3GPP: Release 13 (LTE-Cat M1)
Power: 23 dBm (LTE-M NB-IoT)

BLUETOOTH LE
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; Trasnsmission interval: 5 minutes – 10 days, configurable

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

BATTERY
Battery: 2 x AA 3,6 V, capacity 4 200 mAh (replaceable)

Battery operating time: up to 10 years

DIMENSIONS
27 x 71 x 71 mm
Weight: 100 g