EM300-SLD LoRaWAN Spot Leak Detection Sensor

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EM300-SLD is a compact spot leakage detection sensor for detecting the presence of water (or other liquids) and transmitting alarms using LoRaWAN® technology. With this low power consumption technology, EM300-SLD can work up to 5 years with a 4000 mAh battery. Combining with the Milesight LoRaWAN® gateway and Milesight IoT Cloud solution, users can manage all sensor data remotely and visually and receive alarms via mobile APP. EM300-SLD also integrates temperature and humidity sensors, which has great use for applications such as pipe leakage monitoring, basement flooding, pump failure, etc.


  • Detect the presence of liquids by a small water probe and based on the conductive principle
  • Embedded with temperature and humidity sensors for environment monitoring
  • Ultra-wide-distance transmission up to the line of sight of 10km
  • IP67 UV-resistant and waterproof enclosure for harsh environment applications
  • Built-in 4000 mAh replaceable battery and works for 5 years without replacement
  • Equipped with NFC for easy configuration
  • Compliant with standard LoRaWAN® gateways and network servers
  • Quick and easy management with Milesight IoT Cloud solution

Wireless Transmission

  • Technology LoRaWAN®
  • Frequency CN470/IN865/RU864/EU868/US915/AU915/KR920/AS923
  • Tx Power 16dBm(868)/20dBm(915)/19dBm(470)
  • Sensitivity -147dBm @300bps
  • Mode OTAA/ABP Class A


  • Leakage Detection
  • Trigger Condition When liquid level reaches 5mm
  • Cable Length 1.5m (customizable)


  • Range -30°C to + 70°C
  • Accuracy 0°C to + 70°C (+/- 0.3°C), -30°C to 0°C (+/- 0.6°C)
  • Resolution 0.1°C


  • Range 0% to 100% RH
  • Accuracy 10% to 90% RH (+/- 3%), below 10% and above 90% RH (+/- 5%)
  • Resolution 0.5% RH


  • Power On & Off NFC, power button (Internal)
  • Configuration Mobile APP(via NFC) or PC software (via USB Type-C)

Physical Characteristics

  • Power Supply 1 × 4000 mAh ER18505 Li-SOCL2 battery (extendable to 2 batteries)
  • Battery Life* >5 years (10 min interval and alarm once every day, SF10)
  • Operating Temperature -30°C to +70°C
  • Relative Humidity 0% to 100% (non-condensing)
  • Ingress Protection IP67
  • Dimension 105.6 × 85.3 × 27 mm (4.16 × 3.36 × 1.06 in)
  • Installation Wall Mounting

*Tested under laboratory conditions and for guideline purposes only.

We build to order