Milesight Sensor WS303
Milesight WS303 is a smart water leak detector with two stainless steel probes that detect water as low as 0.5 mm. It features a built-in buzzer for local alerts, sends notifications through LoRaWAN, and offers up to 5 years of battery life. Its compact IP67 design allows installation even in hard-to-reach places.
Integration Links
General configuration
Configuration is done via NFC using the Milesight ToolBox app.
For sensor configuration instructions, see 👉 General configuration.
LoRaWAN Network Options
For information about supported LoRaWAN network server platforms, see 👉LoRaWAN Network Options
LoRaWAN configuration
| Parameter | Value |
|---|---|
| Join type | OTAA |
| AppEUI/JoinEUI | 24E124C0002A0001 |
| AppKey | 5572404C696E6B4C6F52613230313823 |
Data Encoding & Decoding
| Type | GitHub Link |
|---|---|
| Decoder | View decoder |
| Encoder | View encoder |
| Codec | View codec |
Power supply
| Type | Value |
|---|---|
| Power | CR2450 battery |
Technical Specifications
| Parameter | Value |
|---|---|
| Wireless Transmission | |
| Technology | LoRaWAN®, Milesight D2D |
| Antenna | Internal |
| Frequency | CN470 / IN865 / RU864 / EU868 / US915 / AU915 / KR920 / AS923-1&2&3&4 |
| Tx Power | 16 dBm (868MHz) / 20 dBm (915MHz) / 19 dBm (470MHz) |
| Sensitivity | -137 dBm @300bps |
| Mode | OTAA / ABP Class A |
| Leakage Detection | |
| Liquid Type | Conductive liquid |
| Trigger Condition | ≥ 0.5 mm liquid level |
| Others | |
| Buzzer | Yes |
| Configuration | NFC App / Downlink |
| Advanced Features | D2D Controller, Water Leakage Alarm |
| Physical Characteristics | |
| Power Supply | 1 × CR2450 (590 mAh) |
| Battery Life | ~5.7 years (typical use, 25°C) |
| Operating Temp | -10°C ~ +60°C |
| Humidity | 0%–100% RH (non-condensing) |
| Ingress Protection | IP67 |
| Dimensions | 63 × 63 × 14 mm |
| Weight | 36.4 g (incl. battery) |
| Material | ABS+PC, White |
| Installation | 3M Tape / Desktop |
| Approvals | CE, FCC, RoHS |