Milesight - EM300-SLD & EM300-ZLD
Leakage Detection Sensors

The Milesight EM300-SLD Spot Leak Detection Sensor and the Milesight EM300-ZLD Zone Leak Detection Sensor are compact leakage sensors for detecting the presence of liquids and preventing water damage to valuable assets. Its ultra-low power consumption technology offers a 5 year lifespan using the 4000 mAh battery to enable a 10 year service life. Common use cases include pipe leakage monitoring, indoor flooding and managing network server rooms.

Theses sensor offers temperature and humidity monitoring which can be enhanced by integrating with other temperature and humidity sensors. Data can be stored locally with 2800 historical records to secure the traceability of reported information. With the support of data retransmission, the EM300-SLD guarantees data transfer even if the network is down.

The EM300-SLD and EM300-ZLD have a data transmission range of 15 km in rural areas and 2 km in urban environments. This makes the Milesight Leak Detection Sensors compatible with various industry-standard LoRaWAN gateways.


  • Detect liquid presence with the included 1.5m cable
  • Equipped with temperature and humidity sensors
  • IP67 UV resistance with waterproof and dustproof enclosure
  • Line of sight transmission of 10km
  • Stores 2800 historical records and supports data retransmission
  • Equipped with NFC for easy configuration
  • Compliant with standard LoRaWAN gateways and network servers


Physical Characteristics
Dimensions105.6 mm x 85.3 mm x 27 mm
InstallationWall mount
Environmental Characteristics
Operating Temperature-30C to +70C
Relative Humidity0% to 100%
Ingress ProtectionIP67
Battery1 4000mAh ER18505 Li-SOCL2 battery
Battery Life10 years
Power On/OffNFC or internal power button
Sensor Characteristics
Leakage DetectionType: EM300-SLD: probe, spot detection, EM300-ZLD: rope, zone detection
Trigger Condition: When liquid level reaches 5mm
Cable Length: 1.5m (EM300-SLD), 3m (EM300-ZLD)
TemperatureRange: -30C to +70C
Accuracy: 0C to +70C (+/-0.3C), -30C to 0C (+/-0.6C)
Resolution: 0.1C
HumidityRange: 0% to 100% RH
Accuracy: 10% to 90% RH (+/-3%), below 10% and above 90% RH (+/-5%)
Resolution: 0.5% RH
Wireless Characteristics
Tx Power16dBm (868) / 20dBm (915) / 19dBm (470)
Sensitivity-137dBm @300bps
ModeOTAA/ABP Class A
Configuration Interface
NFCConfigure with mobile app

Ordering Information and Pricing
Part Number Model Number Description RRP
[A] Milesight EM300-SLD LoRaWAN Spot Leak Detection Sensor
EM300-SLD-915M EM300-SLD LoRaWAN Environmental Monitoring, Spot Leakage Detector, Liquids Temp Humidity, NFC, 1.5m Probe, IP67 $132.00 C3
[B] Milesight EM300-ZLD LoRaWAN Zone Leak Detection Sensor
EM300-ZLD-915M EM300-ZLD LoRaWAN Environmental Monitoring, Zone Leakage Detector, Liquids Temp Humidity, NFC, 3m Probe, IP67 $198.00 C3