Dragino S31B: outdoor LoRaWAN temperature and humidity sensor

Description

Dragino S31B LoRaWAN: all-in-one outdoor temperature and humidity sensor

The Dragino S31B LoRaWAN is an outdoor temperature and humidity sensor, waterproof to IP66, designed for long-range IoT with long range. An evolution of the S31, it integrates directly in its housing the renowned Sensirion SHT31 sensor, fully calibrated, linearized and temperature-compensated, with no remote probe to install.

With a measuring range of -40 °C to +80 °C, an accuracy of ±0.2 °C and ±2 %RH, the S31B transmits its readings via the LoRaWAN protocol to your gateway and IoT platform (TTN, ChirpStack, Actility, Helium, etc.). Available in three LoRaWAN versions: S31B-LB (8,500 mAh), S31B-LB2 (19,000 mAh) and S31B-LS (solar) , it is perfectly suited to smart agriculture, connected buildings, greenhouses, laboratories and the supply chain.

Key features of the Dragino S31B LoRaWAN

• Sensor Sensirion SHT31 built in: calibrated, linearized and compensated
• Measuring range: -40 °C to +80 °C / 0 - 99.9 %RH
• Outstanding accuracy: ±0.2 °C and ±2 %RH
• Fine resolution: 0.01 °C and 0.01 %RH
• Very low long-term drift: < 0.03 °C/year and < 0.25 %RH/year
• Wireless configuration via Bluetooth Low Energy (BLE) from a smartphone
• OTA updates performed remotely for easier maintenance
• Temperature and humidity alarms (configurable)
• Housing IP66 waterproof and anti-condensation specially designed for outdoor use
• Ultra-low power consumption : 5 µA in standby → multi-year battery life
• Configurable periodic uplink

Available LoRaWAN versions

• S31B-LB : non-rechargeable Li/SOCl₂ battery 8,500 mAh : versatile and cost-effective
• S31B-LB2 : non-rechargeable Li/SOCl₂ battery 19,000 mAh : maximum battery life, ideal for remote sites
• S31B-LS - Solar panel + 3,000 mAh rechargeable Li-ion battery, virtually unlimited operation outdoors in sunny conditions

Technical specifications

• Brand: Dragino
• Models: S31B-LB / S31B-LB2 / S31B-LS
• Sensor: Sensirion SHT31 built into the housing
• Temperature measurement: -40 to +80 °C, accuracy ±0.2 °C @ 0-90 °C, resolution 0.01 °C, drift < 0.03 °C/year
• Humidity measurement: 0 to 99.9 %RH, accuracy ±2 %RH, resolution 0.01 %RH, drift < 0.25 %RH/year
• Configuration: Bluetooth Low Energy (BLE) + OTA update
• Operating temperature : -40 °C to +85 °C
• Protection rating: IP66 anti-condensation
• LoRa specifications:
  • HF band: 862-1020 MHz
  • Max RF output power: +22 dBm
  • RX sensitivity: down to -139 dBm
  • Excellent anti-blocking immunity
• S31B-LB / S31B-LB2 power supply: non-rechargeable Li/SOCl₂ battery 8,500 / 19,000 mAh, self-discharge < 1 %/an @25 °C, courant max continu 130 mA, courant de boost 2 A pendant 1 s
• S31B-LS power supply: solar panel + 3,000 mAh rechargeable Li-ion battery
• Power consumption:
  • Standby: 5 µA @ 3.3 V
  • LoRa transmission: 125 mA @ 20 dBm, 82 mA @ 14 dBm

S31 or S31B: what is the difference?

The S31 and the S31B share the same sensor Sensirion SHT31 and the same measurement performance. The main difference lies in the Design :

• S31 : sensor on a 3-meter cable, ideal when the measurement must be taken away from the electronics housing
• S31B : sensor built directly into the housing, plus BLE configuration and OTA updates , for faster commissioning

Choose the S31B for a simple, all-in-one installation, or the S31 if you need to position the probe precisely at a distance.

Why choose LoRaWAN for your temperature and humidity sensors?

LoRaWAN technology LoRaWAN offers a range of up to several kilometers in open areas, with no operator subscription. It is the ideal solution for farms, greenhouses, campuses, private industrial sites, municipalities and large infrastructures, where you can deploy your own LoRaWAN gateway. With its very low data rate and minimal power consumption, the S31B can send its readings for several years on a single battery.

Applications

• Smart agriculture & greenhouses : crop temperature and humidity monitoring
• Connected buildings & home automation : HVAC, BMS, zone monitoring
• Supply chain & cold chain : warehouses, fridges, sensitive stock
• Laboratories : regulatory environmental monitoring (HACCP, GxP)
• Smart cities : street furniture, local weather, urban monitoring
• Server rooms & data centers : continuous temperature / humidity monitoring
• Heritage & museums : preventive conservation of artworks and archives

Frequently asked questions (FAQ)