1. Introduction
The Moray ME201W is an ultrasonic liquid level sensor designed for remote monitoring of water and other liquid tanks. It integrates with the Tuya Smart or Smart Life mobile applications, allowing users to track liquid levels, set alarms, and optionally control pumps from anywhere. This manual provides detailed instructions for the installation, setup, operation, and maintenance of your ME201W sensor.
2. Safety Information
- Ensure the power adapter is connected to a suitable AC 110V-240V power source.
- Do not attempt to disassemble or modify the sensor, as this may void the warranty and cause damage.
- Keep the device away from extreme temperatures and direct sunlight.
- Ensure proper ventilation around the power adapter.
- The sensor is rated IP65 for protection against dust and water jets, but it is not designed for submersion.
3. Package Contents
Please check the package for the following items:
- ME201W Liquid Level Sensor
- AC/DC Power Adapter (EU, US, UK, or AU type, depending on region)
- Installation Mark (3M adhesive)
- Self-tapping screws
- User Manual (PDF available online)
Figure 1: ME201W Sensor, Power Adapter, and App Interface
Figure 2: Available Power Adapter Types
4. Specifications
| Feature | Specification |
|---|---|
| Model Number | ME201W |
| Type | Digital Ultrasonic Liquid Level Sensor |
| Power Supply | 5V DC, 100mA |
| Input Voltage (Adapter) | 100-240V AC |
| Level Range | 0.1m - 4m (10cm - 400cm) |
| Accuracy | ±0.02m |
| Operation Temperature | -20°C to 70°C |
| Protection Rating | IP65 |
| Wireless Connectivity | 2.4G WiFi (IEEE 802.11 b/g/n) |
| App Compatibility | Tuya Smart APP, Smart Life APP |
| PCB Included | Yes |
| Battery Included | No |
| Certifications | CE |
Figure 3: Sensor Dimensions
5. Setup
5.1 Physical Installation
- Prepare the Tank Surface: In the center of the tank's top surface, paste the provided 3M installation mark.
- Drill the Hole: Drill a hole with a diameter of 55mm (or greater than 60mm as per OCR) right in the middle of the marked area.
- Position the Sensor: Place the ME201W sensor over the drilled hole, ensuring it is centered and the ultrasonic probe is unobstructed.
- Secure the Sensor: Fasten the sensor using the self-tapping screws. If the mounting surface is curved, ensure the sensor is fixed securely but not overly stressed. If data appears abnormal, loosen the screws slightly.
Figure 4: Physical Installation Steps
Installation Guidelines:
- Hold the sensor perpendicular to the liquid surface.
- Install the sensor away from the water inlet to avoid pseudo-echoes.
- The sensor installation cannot be close to the bulkhead, as this will cause a strong pseudo-echo.
Figure 5: Sensor Placement Guidelines
5.2 App Connection and Pairing
- Power On: First, connect the AC/DC power adapter to a power outlet, then connect it to the ME201W sensor.
- Download App: Scan the QR code provided in the original manual or search for "Tuya Smart APP" or "Smart Life APP" in your mobile device's app store and download it.
- Enable Wireless: Turn on both Wi-Fi and Bluetooth on your mobile phone.
- Add Device in App: Open the Tuya Smart or Smart Life app. The app should automatically search for nearby devices. If not, select "Add Device" and follow the prompts.
- Connect to Sensor: Click on the detected "ME201W Level Sensor" in the app.
- Enter Wi-Fi Information: Enter your 2.4GHz Wi-Fi network name and password when prompted. Note: The sensor only supports 2.4GHz Wi-Fi.
- Confirm Connection: Once connected, the LED light on the sensor should turn solid. If the app fails to find the device or connect, proceed to network reset.
Figure 6: App Pairing Steps (Part 1)
Figure 7: App Pairing Steps (Part 2)
Network Reset:
If the device fails to connect or is not found, press and hold the touch button on the sensor for 5 seconds. The LED light will flash rapidly. Release the button, and the sensor will reset its network connection, allowing you to attempt pairing again.
6. Operation
6.1 Monitoring Liquid Level
Once connected, open the Tuya Smart or Smart Life app to view the liquid level interface. You can monitor the liquid level ratio, liquid level depth, and current status (Normal, Full Alarm, Lower Alarm) in real-time. The app also displays the supply voltage and historical data.
Figure 8: Remote Monitoring via App
Video 1: Demonstration of liquid level changes and app alarms.
6.2 Setting Alarms
Within the app's settings for the ME201W sensor, you can configure alarm thresholds:
- Installation Height (A): Set the distance from the sensor to the bottom of the tank.
- Liquid Maximum Depth (B): Define the maximum height of liquid the tank can hold.
- Set Max (High Level Alarm): Configure the percentage or depth at which a "Full Alarm" will be triggered.
- Set Min (Low Level Alarm): Configure the percentage or depth at which a "Lower Alarm" will be triggered.
When the liquid level exceeds the set maximum or falls below the set minimum, the app will send a notification.
Figure 9: App Alarm States
6.3 Control Pump (Optional)
The ME201W sensor can be integrated with a pump control system (e.g., via a solid-state relay) to automate liquid level management. The pump working mode is set to "Refilling" by default. This allows the system to automatically activate a pump to refill the tank when the liquid level drops below a certain threshold, or to stop filling when it reaches a high level.
Figure 10: Optional Pump Control Setup
6.4 Multi-Tank Monitoring
The Tuya Smart/Smart Life app supports adding multiple ME201W sensors, allowing you to monitor several tanks simultaneously from a single interface. Each sensor will appear as a separate device (e.g., P1, P2, P3) in the app.
Figure 11: Multi-Tank Monitoring
7. Maintenance
- Cleaning: Periodically clean the sensor's surface to ensure accurate readings. Use a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Firmware Updates: Check the Tuya Smart/Smart Life app regularly for any available firmware updates for the sensor to ensure optimal performance and access to new features.
- Power Supply: Ensure the power adapter is in good condition and the connection is secure.
- Network Stability: A stable 2.4GHz Wi-Fi connection is crucial for continuous monitoring. Ensure your router is within range and functioning correctly.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Sensor not connecting to app / LED flashing slowly | Incorrect Wi-Fi credentials, 5GHz Wi-Fi network, sensor not in pairing mode, poor Wi-Fi signal. | Ensure you are using a 2.4GHz Wi-Fi network. Perform a network reset (press and hold touch button for 5s). Re-enter Wi-Fi password carefully. Ensure phone and sensor are on the same Wi-Fi network during setup. Move sensor closer to router. |
| Inaccurate liquid level readings | Improper sensor installation, obstacles in the tank, sensor stressed by mounting. | Verify sensor is perpendicular to liquid, away from water inlets, and not near bulkheads. Ensure no obstacles in the reflection area. Loosen mounting screws if the sensor appears stressed. Check and adjust 'Installation Height' and 'Liquid Maximum Depth' settings in the app. |
| No alarm notifications | Alarm thresholds not set, app notifications disabled, poor network connection. | Set 'Set Max' and 'Set Min' thresholds in the app. Ensure app notifications are enabled in your phone's settings. Check Wi-Fi connection. |
| Pump control not working | Incorrect wiring, pump working mode not configured, relay issue. | Verify wiring between sensor, relay, and pump. Check pump working mode in app settings. Ensure the relay is functioning correctly. |
9. User Tips
- The device offers accurate water level measurement and effective monitoring reminders.
- Users have reported fast connection speeds and wide Wi-Fi coverage, making it reliable for remote tracking.
- The product is generally considered to be of good quality for keeping track of water levels.
10. Frequently Asked Questions (FAQ)
- Q: What is the power supply voltage for the sensor?
- A: The sensor operates on 5V DC. The provided AC/DC adapter converts AC 100-240V to 5V DC.
- Q: Is this device recommended for use in a petrol tank?
- A: This device is primarily designed for water and similar non-flammable liquids. Using it with petrol or other highly flammable/corrosive liquids is not recommended and may pose safety risks or damage the sensor. Please consult the manufacturer for specific liquid compatibility.
- Q: Does this device work with the ewelink APP?
- A: The ME201W sensor is designed to work with the Tuya Smart APP or Smart Life APP. Compatibility with other third-party apps like ewelink is not guaranteed by the manufacturer.
11. Warranty & Support
For technical assistance, troubleshooting, or warranty inquiries, please contact the seller or manufacturer directly. A detailed user manual in PDF format is also available for download: User Manual (PDF).