[S31-LB] LoRaWAN Temperature & Humidity Sensor

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    The Dragino S31-LB is a LoRaWAN Temperature and Humidity Sensor for the Internet of Things solution. It is used to measure the surrounding environment temperature and relative air humidity precisely, and then upload to the IoT server via LoRaWAN wireless protocol.

    The temperature & humidity sensor used in S31-LB is SHT31, which is fully calibrated, linearized, and temperature-compensated digital output from Sensirion, it provides strong reliability and long-term stability. The SHT31 is fixed in a waterproof anti-condensation casing for long-term use.

    The LoRa wireless technology used in S31-LB allows the device to send data and reach extremely long ranges at low data rates. It provides ultra-long-range spread spectrum communication and high interference immunity while minimizing current consumption.

    S31-LB supports the Temperature & Humidity alarm feature, the user can set the temperature alarm for instant notice. S31-LB supports the Datalog feature, it can save the data when there is no LoRaWAN network and uplink when the network recovers.

    S31-LB supports BLE configure and wireless OTA update which make users easy to use.

    S31-LB is powered by an 8500mAh Li-SOCI2 battery it is designed for long-term use up to 5 years.

    Each S31-LB is pre-load with a set of unique keys for LoRaWAN registrations, register these keys to the local LoRaWAN server and it will auto-connect after powering on.


    • LoRaWAN 1.0.3 Class A
    • Ultra-low power consumption
    • External 3 meters SHT31 probe (For S31-LB)
    • Measure range -40°C ~ 80°C
    • Temperature & Humidity alarm
    • Bands: IN865 Mhz
    • Support Bluetooth v5.1 and LoRaWAN remote configure
    • Support wireless OTA update firmware
    • Uplink on periodically
    • Downlink to change configure
    • IP66 Waterproof Enclosure
    • 8500mAh Li/SOCl2 Battery 


    • Wireless Alarm and Security Systems
    • Home and Building Automation
    • Automated Meter Reading
    • Industrial Monitoring and Control
    • Long range Irrigation Systems,etc. 


    Common DC Characteristics:

    • Supply Voltage: Built-in Battery , 2.5v ~ 3.6v
    • Operating Temperature: -40 ~ 85°C

    Temperature Sensor:

    • Range: -40 to + 80°C
    • Accuracy: ±0.2 @ 0-90 °C
    • Resolution: 0.1°C
    • Long Term Shift: <0.03 °C/yr

    Humidity Sensor: 

    • Range: 0 ~ 99.9% RH
    • Accuracy: ± 2%RH ( 0 ~ 100%RH)
    • Resolution: 0.01% RH
    • Long Term Shift: <0.25 %RH/yr

    LoRa Spec:

    • Frequency Range,  Band 1 (HF): 865  Mhz
    • Max +22 dBm constant RF output vs.
    • RX sensitivity: down to -139 dBm.
    • Excellent blocking immunity


    • Li/SOCI2 un-chargeable battery
    • Capacity: 8500mAh
    • Self-Discharge: <1% / Year @ 25°C
    • Max continuous current: 130mA
    • Max boost current: 2A, 1 second

    Power Consumption:

    • Sleep Mode: 5uA @ 3.3v
    • LoRa Transmit Mode: 125mA @ 20dBm, 82mA @ 14dBm

    Package Includes:

    • 1 x S31-LB LoRaWAN Temperature & Humidity Sensor 

    Dimension and weight: 

    • Device Size: 120 * 55 * 200 mm
    • Device Weight: 370g