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LSN50V3 S31-LB LoRaWAN Temperature & Humidity Sensor


S31-LB is a LoRaWAN Temperature and Humidity Sensor with a SHT31 sensor probe  based SN50v3-LB or LSN50V3 supports BLE configure and wireless OTA update.

Center frequency


The Dragino S31-LB is a LoRaWAN Temperature and Humidity Sensor for Internet of Things solution. It is used to measure the surrounding environment temperature and relative air humidity precisely, and then upload to 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 a 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 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 whilst minimizing current consumption.

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

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

S31-LB is powered by 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 local LoRaWAN server and it will auto connect after power on.


LoRaWAN 1.0.3 Class A

Ultra-low power consumption

External 3 meters SHT31 probe (For S31-LB)

Measure range -55°C ~ 125°C

Temperature & Humidity alarm

Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/IN865

Support Bluetooth v5.1 and LoRaWAN remote configure

Support wireless OTA update firmware

Uplink on periodically

Downlink to change configure

IP66 Waterproof Enclosure

8500mAh Battery for long term use.


Common DC Characteristics:

Supply Voltage: built in 8500mAh Li-SOCI2 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): 862 ~ 1020 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 continuously current: 130mA

Max boost current: 2A, 1 second

Power Consumption:

Sleep Mode: 5uA @ 3.3v

LoRa Transmit Mode: 125mA @ 20dBm, 82mA @ 14dBm


Wireless Alarm and Security Systems

Home and Building Automation

Automated Meter Reading

Industrial Monitoring and Control

Long range Irrigation Systems,etc. 

Order Info


XX: the default frequency band

EU433: Default frequency band EU433

CN470: Default frequency band CN470

EU868: Default frequency band EU868

IN865: Default frequency band IN865

KR920: Default frequency band KR920

AS923: Default frequency band AS923

AU915: Default frequency band AU915

US915: Default frequency band US915

KZ865: Default frequency band KZ865

Package Includes:

1 x S31-LB LoRaWAN Temperature & Humidity Sensor 

Dimension and weight: 

Device Size: 120 * 55 * 200 mm

Device Weight: 370g

Useful Link:

Product Details
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LSN50V3 S31-LB LoRaWAN Temperature & Humidity Sensor

S31-LB is a LoRaWAN Temperature and Humidity Sensor with a SHT31 sensor probe  based SN50v3-LB or LSN50V3 supports BLE configure and wireless OTA update.

Write your review

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