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  1. Detection - Measurement
  2. Flow, Pressure and Level Measurements
  3. Electronic leak detector
  4. Milesight IoT
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Electronic leak detector WS303
liquidfor conductive liquidswater

Electronic leak detector - WS303 - Milesight IoT - liquid / for conductive liquids / water
Electronic leak detector - WS303 - Milesight IoT - liquid / for conductive liquids / water
Electronic leak detector - WS303 - Milesight IoT - liquid / for conductive liquids / water - image - 2
Electronic leak detector - WS303 - Milesight IoT - liquid / for conductive liquids / water - image - 3
Electronic leak detector - WS303 - Milesight IoT - liquid / for conductive liquids / water - image - 4
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Characteristics

Technology
electronic
Detected fluid
liquid, for conductive liquids, water
Other characteristics
battery powered, wireless, compact, wall-mounted, LoRaWAN, with audible signal, with alarm
Applications
for small leaks, for industry, building

Description

Overview
  • Compact wireless water leak sensor detecting conductive liquids; triggers immediate local buzzer alert and remote LoRaWAN® uplink when liquid reaches 0.5 mm.
  • Supports Milesight D2D for direct device-to-device automatic responses and standard LoRaWAN® for wide-area monitoring.


Key Features
  • High sensitivity: detects liquid contact from 0.5 mm.
  • Immediate alerts: built-in buzzer (configurable on/off) and remote notifications via LoRaWAN®; buzzer can stop automatically or by downlink.
  • D2D automatic response: can trigger Milesight D2D-capable controllers (e.g., UC300/UC100) for automatic valve shutoff.
  • Long-range connectivity: LoRaWAN® transmission with stable urban and rural performance.
  • Long battery life: powered by 1 × 590 mAh CR2450 coin cell for multi-year operation; built-in capacitor enables power-failure alarm.
  • Compact and robust: mini design for discreet placement; IP67 ingress protection; corrosion-resistant probes and stainless steel fasteners.
  • One-tap NFC configuration: quick on/off and parameter setup via Milesight ToolBox App using NFC.


Applications
  • Server rooms and data centers for early leak detection under racks and equipment.
  • Bathrooms, kitchens and humid public spaces where IP67 and corrosion resistance are required.
  • Laboratories and sensitive instrument areas for discreet, precise placement.
  • Libraries, archives and storage rooms to protect humidity-sensitive documents and goods.
  • Cold storage and facilities requiring continuous low-power monitoring.


Installation & Configuration
  • Flexible mounting: surface placement, wall mounting or 3M tape for quick deployment in constrained spaces.
  • One-tap NFC via mobile app for fast configuration and on/off control; also configurable via LoRaWAN® downlinks.


Connectivity & Integration
  • Supports standard LoRaWAN® and Milesight D2D for both wide-area monitoring and low-latency direct device linkage to Milesight controllers.
  • Compatible with mainstream LoRaWAN® platforms through gateways and standard payload decoding.


Specifications / Technical specifications
  • Wireless Transmission: LoRaWAN® / Milesight D2D; Internal antenna; Frequency options: 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: -137 dBm @300bps; Mode: OTAA / ABP Class A.
  • Leakage Detection: Conductive liquids; Trigger: liquid level reaches 0.5 mm.
  • Alarms & Features: Built-in buzzer (on/off); local audible alarm and remote notification; power-failure alarm via built-in capacitor; D2D linkage for valve shutoff; NFC & LoRaWAN® configuration.
  • Physical: Power: 1 × 590 mAh CR2450; Battery life*: ~5.7 years (assumption: 1 h leakage/week, 25°C); Operating temp: -10°C to +60°C; RH: 0–100% (non-condensing); IP rating: IP67; Dimension: 63 × 63 × 14 mm; Weight: 36.4 g (with battery); Material: ABS+PC, white; Installation: 3M tape or desktop.
  • Approvals: CE, FCC; Environmental: RoHS.

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IoT LoRaWAN® Series

*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.
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