1. Introduction
The MorayElec ME202D is a high-performance liquid level monitoring device designed for water and oil tanks. It features remote wireless ultrasonic technology, providing high accuracy and efficiency in monitoring liquid levels without manual intervention. This device integrates with the Tuya SmartLife APP, enabling intelligent remote monitoring from your mobile device.

Key advantages include unattended automatic detection, high-precision liquid level measurement, and intelligent remote monitoring. Its simple design ensures easy installation and use, facilitating better management of water tank liquid levels and ensuring the stability and safety of your water supply system.

2. Specifications
| Feature | Specification |
|---|---|
| Product Name | Fluid Level Monitor |
| Model Number | ME202D |
| Brand Name | morayelec |
| Certification | CE |
| Origin | Mainland China |
| Application | Water /Oil Tank |
| Usage | Home Automation System |
| Operating Temperatures | -20-70℃ |
| Operation System | Android, iOS APP |
| APP | Tuya SmartLife |
| Measuring Range | 3m |
| Accuracy | ±0.5% |
| Power Supply | 100-240VAC to DC 5V |
| Battery Included | No |
| High-concerned chemical | None |
2.1 Product Dimensions




2.2 Scenario Suitability (ME202D vs. ME201W)
- Floating Objects: The ME202D is designed to not be disturbed by floating balls or objects in the tank, unlike the ME201W.
- Underground Tanks: The ME202D is suitable for underground water tanks, whereas the ME201W is not applicable.
- High Humidity: The ME202D is suitable for high humidity environments, addressing issues like water droplets inside the tank cover that could affect ME201W measurements.
3. Package Contents
The package typically includes:
- MorayElec ME202D Liquid Level Sensor Unit
- Sensor Probe with Cable
- AC/DC Power Adapter (5V)
- Mounting accessories (screws, anchors) - (Inferred from images, not explicitly listed)
4. Setup and Installation
4.1 Physical Installation
The ME202D sensor is designed for easy and flexible installation. It can be mounted on the side of a tank, or in other suitable positions depending on your tank type (e.g., outdoor, underground). Ensure the sensor probe is correctly positioned within the liquid to be monitored.

4.2 Power Connection
- Connect the sensor unit to the AC/DC power adapter.
- Plug the AC/DC adapter into a suitable power outlet.
- Ensure the sensor is powered on.
4.3 App Download and Network Setup
To utilize the smart features, download the 'TUYA Smart APP' or 'Smart Life APP' on your mobile device.
- Scan the QR code provided in the product packaging or search for 'TUYA Smart' or 'Smart Life' in your device's app store.
- Install and open the application.
- Network Reset: Press and hold the button on the sensor unit for 5 seconds. The LED light will flash rapidly. Release the button to initiate the network reset. The device will then attempt to connect to the network automatically.
- Connecting Sensors to APP: Turn on Wi-Fi and Bluetooth on your mobile phone. Open the app and select 'Add Device'. The app should discover the ME202D Level Sensor. Follow the on-screen prompts to complete the connection, including entering your Wi-Fi information.


5. Operating Instructions
Once connected, the MorayElec ME202D allows for real-time monitoring and management of liquid levels through the Tuya SmartLife APP.
5.1 Real-time Monitoring
- Open the Tuya SmartLife APP on your mobile device.
- Select the 'ME202D Level Sensor' from your list of devices.
- View the current liquid level ratio, liquid level depth, and status (e.g., Normal, Lower alarm).
- The app also displays the supply voltage and historical data for liquid level depth over time (Day, Month, Year).
5.2 Multi-Tank Monitoring
The system supports monitoring multiple tanks simultaneously, providing a comprehensive overview of all connected liquid levels within the app.

5.3 Smart Features
- Remote Wireless Ultrasound: Provides accurate readings over long transmission distances.
- Mobile Phone Control: Monitor and manage liquid levels remotely from anywhere with an internet connection.
- Touch Switch: The device features a convenient touch switch for operation.

6. Maintenance
- Cleaning: Periodically clean the sensor probe to prevent buildup that could affect accuracy. Use a soft cloth and mild detergent if necessary. Ensure the probe is completely dry before re-installation.
- Environmental Conditions: Ensure the sensor unit is protected from extreme weather conditions if installed outdoors, although it is designed for various environments.
- Firmware Updates: Check the Tuya SmartLife APP regularly for any available firmware updates for the device to ensure optimal performance and security.
- Power Supply: Use only the provided AC/DC adapter or a compatible replacement with the correct voltage (5V) to avoid damage.
7. Troubleshooting
- Device Not Connecting to App:
- Ensure Wi-Fi and Bluetooth are enabled on your phone.
- Perform a network reset on the sensor (press and hold the button for 5 seconds until the LED flashes rapidly).
- Verify your Wi-Fi network credentials are correct.
- Ensure the sensor is within range of your Wi-Fi router.
- Inaccurate Readings:
- Check if the sensor probe is clean and free from obstructions or buildup.
- Ensure the probe is fully submerged in the liquid and correctly positioned according to installation guidelines.
- Verify the tank dimensions or calibration settings in the app, if applicable.
- No Power:
- Check the power adapter connection to both the sensor and the power outlet.
- Ensure the power outlet is functional.
8. User Tips
- For optimal performance, place the sensor unit in a location that provides good Wi-Fi signal strength.
- Regularly check the app for notifications and alarms to stay informed about liquid levels.
- Consider setting up automated routines within the Tuya SmartLife app for alerts or actions based on liquid levels.
9. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the seller's specific warranty policy or contact the MorayElec customer support directly. Contact details can typically be found on the product packaging or the seller's official website.