Electronic leak detector EM300 series

waterliquidfor conductive liquids

Overview
The Milesight EM300-SLD/ZLD is a LoRaWAN leak detection sensor that identifies the presence of water and other conductive liquids and sends remote alerts for leaks, spills or floor wetness. Available in probe and rope sensing variants, it is designed for industrial and commercial monitoring where early leak detection and environmental monitoring are required.

Sensor types

• EM300-SLD (Probe type): probe-style sensor detecting liquid at two fixed points; standard probe cable length 1.5 m (customizable).
• EM300-ZLD (Rope type): rope-style sensor for coverage over larger areas; standard sensing cable length 3 m (customizable; optional cables available up to hundreds of meters).

Key features

• Detects conductive liquids (water and other conducting fluids); trigger when liquid reaches approximately 5 mm.
• IP67 enclosure and UV-resistant materials for harsh environment use.
• Integrated temperature and humidity sensors for combined environmental monitoring.
• Customizable alarm reporting intervals and scheduled alarm times to fit diverse deployment needs.
• On-device storage for up to ~2,800 historical records (non-removable to preserve traceability).
• Data retransmission support to improve reliability under intermittent network conditions.
• Multi-year battery operation depending on configuration and reporting frequency (see datasheet for examples).

Connectivity & Cloud

• LoRaWAN® communication (OTAA/ABP, Class A).
• Compatible with standard LoRaWAN gateways and network servers.
• Supports Milesight D2D (device-to-device) communication for direct interaction with D2D-capable nodes and controllers.
• Integrates with Milesight IoT Cloud for dashboards, automatic triggers, reports and real-time alerts; mobile management (Android/iOS) supported.

Configuration & commissioning

• NFC configuration via Milesight ToolBox app (phone or NFC-capable PC) for parameter setup and initial commissioning.
• Downlink configuration supported through LoRaWAN network server.

Installation

• Transceiver mounting: wall screw, 3M tape or cable-tie mounting.
• Sensor probe/rope mounting: wall screw, 3M tape or cable-tie as appropriate for the chosen sensing type.

Technical specifications

• Model (commercial denomination): EM300-SLD/ZLD
• Wireless technology: LoRaWAN® (OTAA/ABP), Milesight D2D
• Antenna: internal antenna
• Frequencies (variants): CN470 / IN865 / RU864 / EU868 / US915 / AU915 / KR920 / AS923-1/2/3/4
• Tx power: 16 dBm (868 MHz) / 20 dBm (915 MHz) / 19 dBm (470 MHz)
• Sensitivity: down to -137 dBm @300bps
• Leak detection: conductive liquids; trigger at ~5 mm liquid level
• Sensing cable length: EM300-SLD probe 1.5 m (standard, customizable); EM300-ZLD rope 3 m (standard, customizable; optional long cables up to hundreds of meters)
• Temperature sensor: range -30 °C to +70 °C; accuracy ±0.3 °C (0 °C to +70 °C), ±0.6 °C (-30 °C to 0 °C); resolution 0.1 °C
• Humidity sensor: range 0% to 100% RH; accuracy ±3% (10%–90% RH), ±5% (below 10% and above 90%); resolution 0.5% RH
• LED / Button: 1 × internal LED indicator; 1 × internal power/reset button
• Power supply: 1 × 4000 mAh ER18505 Li-SOCL2 battery (8000 mAh optional)
• Battery life example: Over 10 years (SF7, EU868 & US915) with 10 min reporting interval + 24 triggers/day; shorter under higher SF / more frequent reporting
• Operating temperature: -30 °C to +70 °C
• Operating humidity: 0% to 100% (non-condensing)
• Ingress protection: IP67
• Housing & materials: Transceiver ABS+PC (flame retardant), white; Probe stainless steel 316; Rope: PE + steel wire (typically yellow & black)
• Dimension (transceiver): 105.6 × 85.3 × 27 mm
• Installation methods: wall screw, 3M tape, cable-tie mounting
• Storage & logging: on-device storage up to ~2,800 records (non-removable)
• Advanced features: threshold alarm, configurable reporting intervals/times, data retransmission, NFC configuration, Milesight D2D support
• Approvals: CE, FCC, ISED, RCM, Telec, ICASA (region-dependent); RoHS