1. Product Overview
The Xiaomi Water Sensor 2 is a smart flood and water leak detector designed to provide early warnings for potential water damage in your home. Utilizing Bluetooth 5.2 connectivity, it integrates with the Mi Home App and can trigger various alarm methods, including acousto-optic alarms, app notifications, and smart device linkages. Its robust IP67 dustproof and waterproof design, coupled with a 3-year ultra-long life battery, ensures reliable performance in humid environments.
Image: Overview of the Xiaomi Water Sensor 2 highlighting its multi-scenario leak detection, multiple alarm methods, and 3-year ultra-long life battery.
Image: Visual summary of the sensor's capabilities, including IP67 protection and Mi Home app integration.
2. Setup and Installation
Before installation, ensure you have a compatible Bluetooth gateway and the Mi Home App installed on your smartphone.
2.1 Important Pre-requisites
- This product is the Chinese version. When connecting to the Mi Home App, you MUST set the App region to China Mainland for it to function correctly.
- This product requires a Bluetooth gateway to operate and cannot be used separately.
2.2 Mi Home App Configuration
- Open the Mi Home App.
- Log in to your account.
- Navigate to your profile (usually a 'Profile' or 'Me' tab).
- Go to 'Additional settings' or 'Settings'.
- Select 'Region' and ensure it is set to 'Chinese mainland'.
Image: Screenshots illustrating how to set the Mi Home App region to 'Chinese mainland'.
2.3 Device Pairing
- Ensure your Bluetooth gateway is powered on and connected to the Mi Home App.
- In the Mi Home App, click the "+" icon in the upper-right corner of the homepage to 'Add device'.
- Select "Xiaomi flood guard 2" (or similar name for the water sensor) from the list of available devices.
- Follow the on-screen prompts in the app to complete the pairing process.
Image: Visual guide for adding the device through the Mi Home App.
2.4 Placement
Place the sensor in areas where water leaks are likely to occur. The sensor detects water at two levels: top spray and bottom immersion.
- Immersion Detection: The bottom double probe design detects flooding when water height reaches 0.5mm.
- Top Spray Detection: The top poly water design triggers an alarm when water covers the top two probes.
Recommended placement locations:
- Under kitchen sinks
- Next to water inlets/outlets of washing machines or dishwashers
- Bathroom floors
- Near water heaters or radiators
- Easy-to-enter positions of window sills
Image: Examples of optimal sensor placement under a sink and near a radiator.
Image: Illustration of the sensor's bottom double probe design for 0.5mm immersion detection, with placement examples near a washing machine and on a bathroom floor.
Image: Diagram showing the top poly water design, where water covering the probes triggers an alarm.
3. Operating Instructions
The Xiaomi Water Sensor 2 offers multiple alert methods to ensure you are promptly notified of any water leakage.
3.1 Leak Detection
The sensor continuously monitors for water presence. It features a multi-scenario leak detection system with both immersion and drenching guards.
Image: Depiction of immersion guard (water level reaching the sensor base) and drenching guard (water droplets on the sensor surface).
3.2 Alarm Methods
Upon detecting a leak, the sensor can trigger alarms through various channels:
- Acousto-optic alarm: A built-in buzzer and indicator light provide a local alert, which is convenient for quickly locating the leak source. This alarm can also function when the device is offline.
- MIJIA APP smart alarm: Receive remote notifications on your smartphone via the Mi Home App, providing real-time monitoring of flooding status and risk dynamics.
- Smart device alarm: If linked with other smart devices (e.g., smart speakers, smart displays), these devices can play an alert tone.
Image: Visual representation of the acousto-optic alarm, Mi Home App notification, and smart device alarm.
Image: Detailed explanation of the three alarm types, including app features like full-screen reminders.
3.3 Smart Device Linkage
The sensor supports linkage with other Xiaomi smart home devices through the Mi Home App and a Bluetooth Mesh gateway. This allows for personalized automation scenarios, such as automatically powering off a smart wall socket connected to a washing machine if a leak is detected.
Image: Diagram showing how the Water Leak Sensor can link with a Smart Wall Socket and Gateway to automatically cut power upon leak detection.
Image: The water sensor integrated into a broader home security system alongside a Xiaomi smoke detector and natural gas guard.
4. Maintenance
4.1 Battery Life
The Xiaomi Water Sensor 2 uses a CR2450 button battery with an ultra-low power consumption design, providing an endurance of up to 3 years without frequent battery replacement. This estimate is based on the device reporting information every 15 minutes and generating water spraying or flooding alarm events twice a year, along with 100 short-term follow-up tests annually. Actual usage may vary.
Image: Graphic emphasizing the 3-year battery life of the sensor.
Image: Detailed explanation of the 3-year battery life calculation and conditions.
4.2 Durability and Design
The sensor is built for durability and reliability:
- IP67 Dustproof and Waterproof: No fear of dust and humid environments, ensuring long-term operation.
- UV-resistant Material: Durable and resistant to yellowing over time.
- Corrosion Resistance: Features a nickel-plated metal probe that is anti-rust and anti-corrosion for longer use.
Image: Sensor being splashed with water, illustrating its IP67 dustproof and waterproof rating.
Image: Further details on the IP67 protection level, confirming its dustproof and waterproof capabilities.
Image: Close-up views of the sensor highlighting its installation without plug-in, corrosion-resistant metal probe, and nickel plating.
Image: Details on the UV-resistant material for durability and the option for free expansion of monitoring scope.
Image: Exploded view of the Xiaomi Water Sensor 2, showing its internal components including the battery and circuit board, emphasizing its compact and integrated design.
5. Troubleshooting
- Device not connecting to App: Ensure your Mi Home App region is set to "China Mainland". This is a critical step for the Chinese version of the product.
- Sensor not detecting leaks or alarming: Verify that the sensor is properly placed in a location where water can reach its probes. Check the battery level in the Mi Home App.
- No smart device integration: Confirm that you have a functional Bluetooth gateway connected to your Mi Home App. The sensor requires a gateway for smart linkages.
- Gateway compatibility: Not all Xiaomi gateways may be compatible or function optimally with this specific sensor, especially if they are older models or global versions. Ensure your gateway supports Bluetooth Mesh and is updated.
6. Specifications
| Feature | Specification |
|---|---|
| Product Model | SJWS02LM |
| CMIIT ID | 25J44B33A046 |
| Wireless Connection | Bluetooth version 5.2 |
| Battery Specification | CR2450 |
| Operating Temperature | 0°C - 55°C |
| Product Size | Φ55 × 19.5mm |
| Protection Level | IP67 |
| Implementation Standards | GB 4943.1-2022 |
| Power Source | DC |
| Control Channels | 2 CHANNELS |
| State of Assembly | Ready-to-Go |
| Origin | Mainland China |
Image: Table showing product parameters and the packing list (Xiaomi Water Leak Sensor 2 x1, Chinese manual x1).
Image: Comparison chart detailing improvements of Water Leak Sensor 2 over the previous model, including lower immersion detection (0.5mm vs 1mm), longer battery life (3 years vs 1 year), and more alarm settings.
7. User Tips
- Region Setting is Key: Always double-check that your Mi Home app region is set to "China Mainland" for seamless operation and device recognition.
- Gateway is Essential: Remember that a Bluetooth gateway is required for the sensor to function and integrate with your smart home ecosystem.
- Strategic Placement: Place sensors in low-lying areas or directly under potential leak sources for the earliest detection. Consider areas like under sinks, near water heaters, washing machines, and in basements.
- Regular Checks: Periodically check the sensor's status and battery level within the Mi Home app to ensure it's online and ready to detect leaks.
8. Warranty and Support
For warranty information and technical support, please refer to the documentation provided with your purchase or contact the seller directly. Keep your proof of purchase for any warranty claims.
