1. Introduction
The ME201W is a high-accuracy WIFI remote ultrasonic water tank level meter sensor designed for smart home applications. This device provides reliable liquid level monitoring, offering easy installation, high durability, and versatility. It integrates seamlessly with smart home systems like Tuya SmartLife, allowing users to remotely monitor water levels and set up automated controls.
The Tuya Ultrasonic Sensor technology offers numerous advantages, including reliable distance detection, ease of use, high durability, and low maintenance costs, making it a valuable addition to any project.
Video: Overview of the ME201W Ultrasonic Liquid Level Monitor, showcasing its features and application.
2. Safety Information
- Ensure the power supply is within the specified range (100-240VAC to DC 5V).
- Do not expose the device to extreme temperatures outside its operating range (-20°C to 70°C).
- Avoid installing the ME201W in environments with floating balls, high humidity, or steam, as this model is not designed for such conditions. Refer to the ME201W vs ME202W comparison for suitable applications.
- Keep the device away from strong electromagnetic interference.
- Handle with care to prevent physical damage.
3. Package Contents
Upon unboxing your ME201W sensor, please verify that all the following items are included:
- ME201W Level Sensor
- Power Adapter (100-240VAC to DC 5V)
- Mounting Plate
- Self-tapping Screws
- User Manual (this document and a PDF version)
Image: Unboxing photos showing the ME201W sensor, power adapter, mounting plate, and screws.
4. Specifications
| Feature | Specification |
|---|---|
| Model Number | ME201W |
| Product Name | Fluid Level Monitor |
| Type | Digital |
| Application | Water |
| Usage | Home Automation System |
| Measuring Range | 0.1m ~ 4.0m |
| Accuracy | ±0.02m |
| Power Supply | 100-240VAC to DC 5V (≤100mA@ 5V DC) |
| Operating Temperatures | -20°C ~ 70°C |
| Protection Rating | IP65 |
| WiFi Frequency | 2.4G |
| Operation System | Android, iOS APP |
| APP | Tuya SmartLife |
| PCB Included | Yes |
| Battery Included | No |
| Certification | CE |
5. Setup Guide
5.1 Physical Installation
- **Prepare the Tank Surface**: Remove any release paper from the gasket and attach the gasket to the center of the tank where the hole will be drilled.
- **Drill Hole**: Drill a hole with a diameter of >60mm in the middle of the tank.
- **Position the Sensor**: Place the sensor over the gasket, ensuring it is aligned with the screw holes.
- **Secure the Sensor**: Fasten the sensor with self-tapping screws.
Image: Product components, dimensions, and installation steps on a tank.
Important Installation Notes:
- **Perpendicular Placement**: Always hold the sensor perpendicular to the liquid surface for accurate readings.
- **Avoid Water Inlets**: Install the sensor away from the water inlet to prevent pseudo-echoes, which can lead to inaccurate measurements.
- **Clear Bulkhead**: The sensor installation should not be close to the bulkhead, as this can also cause strong pseudo-echoes.
- **Tank Interior**: The inner wall of the tank must be smooth. Avoid rough inner walls.
- **Reflection Area**: Ensure there are no obstacles (e.g., pipelines, protruding outlets, floating balls, boards) in the reflective area of the sensor. The reflection area dimensions are:
- For H=4m, D>2m
- For H=3m, D>1.6m
- For H=2m, D>1.1m
- **Model Suitability**: The ME201W model is **not suitable** for tanks with floating balls, underground water tanks, or environments with high humidity/steam. For these conditions, consider the ME202W model.
Image: Comparison diagram highlighting application differences between ME201W and ME202W models, showing ME201W is not suitable for floating balls, underground tanks, or steam environments.
Image: Diagrams showing correct and incorrect installation methods for the sensor, emphasizing perpendicular placement, avoiding water inlets, and keeping clear of bulkheads.
5.2 App Connection
- **Power On**: First, power on the AC/DC ADAPTOR, then power on the sensor.
- **Download App**: Scan the QR code provided in the manual or search for "TUYA Smart APP" or "Smart Life APP" on your mobile device's app store and install it.
- **Network Reset**: If the sensor is not found or fails to connect, press and hold the button on the sensor for 5 seconds. The LED light will flash rapidly. Release the button to initiate a network reset. The device will then attempt to connect to the network automatically.
- **Connect to App**: Turn on both Wi-Fi and Bluetooth on your phone. Open the Tuya Smart or Smart Life app and follow the prompts to add a new device. Ensure your phone and the sensor are connected to the same 2.4GHz Wi-Fi network during the setup process.
Note:
- The Wi-Fi frequency must be 2.4GHz. 5GHz networks are not supported.
- After successful setup, the indicator light on the sensor should be steady. If the device is not found or connection fails, perform a network reset as described in step 3.
Image: Detailed app screenshots for connecting the sensor, including Wi-Fi setup, adding the device, and viewing the liquid level monitor interface.
6. Operation
6.1 Monitoring Liquid Level
Once connected, open the Tuya Smart or Smart Life app to view the liquid level monitor interface. Here you can see:
- **Liquid Level Ratio**: Percentage of liquid in the tank.
- **Liquid Level Depth**: Actual depth of the liquid in meters.
- **Liquid Level Status**: Indicates if the level is Normal, Full alarm, or Lower alarm.
- **Supply Voltage**: Current voltage of the sensor.
- **Historical Data**: View liquid level depth over Day, Month, or Year.
Video: Demonstration of the ME201W sensor measuring liquid levels in real-time with app updates and alarm notifications.
Image: Screenshots of the app connection process, including Wi-Fi setup, device adding, and displaying normal, full alarm, and low alarm states.
6.2 Setting Alarms
You can configure custom alarm thresholds within the app:
- **Installation Height (A)**: Set the distance from the sensor to the bottom of the tank.
- **Liquid Maximum Depth (B)**: Input the maximum possible height of liquid in your tank.
- **Set Max (High Level Alarm)**: Define the percentage or absolute value for a high-level alarm. For example, if the liquid level reaches 80% of the maximum depth, a "Full alarm" will be triggered.
- **Set Min (Low Level Alarm)**: Define the percentage or absolute value for a low-level alarm. For example, if the liquid level drops below 20% of the maximum depth, a "Lower alarm" will be triggered.
6.3 Control Pump (Optional)
The ME201W can be integrated with a smart plug (sold separately) to control a pump based on liquid levels. This requires setting up automation scenes in the Tuya Smart or Smart Life app:
- **Add Smart Plug**: Ensure your smart plug is connected and configured in the same app.
- **Create "Full Alarm" Scene**:
- Go to "Smart" tab > "Scene" > "Add Scene".
- **Condition**: "When device status changes" > Select your ME201W sensor > "Liquid Level Status" > "Upper level alarm".
- **Action**: "Then" > Select your smart plug > "Switch" > "OFF" (to turn off the pump when the tank is full).
- Save the scene.
- **Create "Low Alarm" Scene**:
- Go to "Smart" tab > "Scene" > "Add Scene".
- **Condition**: "When device status changes" > Select your ME201W sensor > "Liquid Level Status" > "Lower level alarm".
- **Action**: "Then" > Select your smart plug > "Switch" > "ON" (to turn on the pump when the liquid level is low).
- Save the scene.
Image: Wiring diagram demonstrating how to connect the ME201W sensor to a junction box and a pump for automated control based on liquid levels.
Image: Screenshots illustrating the 'APP smart socket steps' for setting up automation, specifically linking the sensor's alarm status to a smart plug's on/off function.
6.4 Share Device
The app allows you to share water tank data with other users, enabling multiple individuals to monitor the liquid levels.
Image: Illustration of multiple ME201W sensors (P1, P2, P3) monitoring different water tanks, all connected to a single smartphone app.
7. Maintenance
- **Cleaning**: Periodically clean the sensor surface to ensure optimal performance. Use a soft, damp cloth. Do not use abrasive cleaners or solvents.
- **Connection Check**: Regularly inspect the power adapter and cable for any signs of damage. Ensure all connections are secure.
- **Firmware Updates**: Check the Tuya Smart or Smart Life app for any available firmware updates for your sensor to ensure you have the latest features and improvements.
8. Troubleshooting
8.1 Common Issues and Solutions
- **Device Not Found / Fails to Connect**:
- Ensure your Wi-Fi network is 2.4GHz. 5GHz networks are not supported.
- Verify that your smartphone and the sensor are connected to the same Wi-Fi network during the setup process.
- Perform a network reset by pressing and holding the button on the sensor for 5 seconds until the LED flashes rapidly.
- Check if the sensor's indicator light is steady after setup. If it's still flashing, the connection might be unstable.
- **Inaccurate Measurement Readings**:
- **Obstacles**: Check for any obstacles (pipelines, protruding outlets, floating balls, boards) in the sensor's reflection area. The area directly below the sensor must be clear.
- **Installation Angle**: Ensure the sensor is installed perfectly perpendicular to the liquid surface.
- **Proximity to Inlets/Bulkheads**: Re-position the sensor if it's too close to a water inlet or tank bulkhead, as this can cause pseudo-echoes.
- **Tank Interior**: Ensure the inner walls of the tank are smooth. Rough surfaces can affect accuracy.
- **Environmental Suitability**: The ME201W is not designed for tanks with floating balls, underground tanks, or high humidity/steam environments. If your application involves these, the ME202W model might be more suitable.
- **Minimum Depth**: The sensor may not be precise for liquid levels less than 0.1m (10cm) or in tanks less than two meters deep.
- **App Disconnects Frequently**:
- Check your Wi-Fi signal strength at the sensor's location.
- Ensure the sensor is within the effective range of your Wi-Fi router (max 50m without obstacles).
- Restart your Wi-Fi router and the sensor.
9. User Tips
- **Easy Setup**: Users report fast connection speeds and an easy-to-use app interface, making initial setup straightforward.
- **Stable Connection**: The app generally maintains a stable connection, minimizing disconnections.
- **Accurate Monitoring**: The sensor provides accurate water level measurements and offers monitoring reminders, which is highly valued by users.
- **Tuya Smart Life Compatibility**: The device is fully compatible with the Tuya Smart Life app, allowing for integration into existing smart home ecosystems.
- **Cable Length**: The sensor comes with a generously long cable, which is often appreciated for flexible installation.
- **Calibration for Fuel Tanks**: While designed for water, the sensor can potentially be used for other liquids like diesel fuel. However, ensure proper calibration and consider the specific properties of the liquid.
- **Installation Position**: Always install the sensor from above, ensuring it is perpendicular to the liquid surface. Side installation is not recommended for accurate readings.
- **Granular Materials**: This sensor is specifically designed for liquid level measurement and is not suitable for measuring bulk materials like granules.
10. Warranty and Support
For detailed warranty information, technical support, and further documentation, please refer to the official user manual PDF available at: User Manual (PDF).
You can also contact morayelec customer support for assistance with any product-related queries or issues.