ME202WSP 5m Smart Home High-Precision WiFi Sensor User Manual

1. Introduction

The ME202WSP 5m Smart Home High-Precision WiFi Sensor is designed for remote monitoring of liquid levels in various tanks, including water and oil. It features solar panel power, app remote control via Tuya Smart APP or Smart Life APP, and provides real-time data and alerts. This device is suitable for harsh environments and offers flexible installation options.

Figure 1: System Overview - Sensor, Solar Panel, and App Monitoring

2. Specifications

Figure 2: Wireless Liquid Level Sensor Specifications and Applications

3. Package Contents

Please check the package for the following items:

• ME202WSP/DS Wireless Level Sensor Unit
• Solar Panel with Cable
• Sensor Probe with Cable
• Mounting Accessories (screws, etc.)
• User Manual (this document and/or PDF)

4. Safety Information

• **Warning:** Do not touch the diaphragm of the sensor to prevent damage.
• Ensure all connections are secure and waterproof, especially in outdoor or humid environments.
• Use the specified power supply (5V 1A Type-C for charging the solar panel).
• Keep the device away from strong electromagnetic interference.
• Do not attempt to disassemble or repair the device yourself. Contact support if issues arise.

5. Setup Guide

5.1 Physical Installation

1. **Charge the Solar Panel:** Before installation, ensure the solar panel is fully charged using a 5V 1A Type-C charger. The green light on the solar panel indicates full charge.
2. **Connect Cables:** First, connect the solar panel cable to the sensor unit, then connect the sensor probe cable to the sensor unit.
3. **Power On:** Power on the solar panel. The sensor's LED light should flash rapidly, indicating it's ready for configuration.
4. **Sensor Placement:** Carefully place the sensor probe into the liquid to be measured. The device supports flexible installation on top or sides of the tank.

Figure 3: Product Dimensions and Flexible Installation

5.2 App Installation

1. **Download App:** Scan the QR code provided in the manual or on the product packaging to download the "TUYA Smart APP" or "Smart Life APP" on your mobile device (available for Android and iOS).
2. **Enable WiFi & Bluetooth:** Turn on WiFi and Bluetooth on your phone.
3. **Open App & Add Device:** Open the downloaded app and navigate to the "Add Device" section.

Figure 4: App Installation Steps

5.3 Network Reset & Connection

1. **Initiate Pairing Mode:** Press and hold the touch key (marked with a circle on the sensor unit) for 5 seconds. The LED light on the sensor will flash rapidly. Release the button. This indicates the device is in network reset/pairing mode.
2. **Connect via App:** The app should automatically search for nearby devices. Once "ME202W Level Sensor" is found, select it.
3. **Enter WiFi Information:** Enter your Home WiFi name and password in the app.
4. **Confirm Connection:** The device will be added. Once connected successfully, the sensor's indicator light will become steady.

Important Notes:

• WiFi frequency can only be 2.4GHz, not 5GHz.
• When adding a device, ensure both the sensor and your phone are connected to the same 2.4GHz WiFi network.
• If the phone cannot find the device or fails to connect, hold down the touch key for 5 seconds again to re-enter pairing mode.

6. Operating Instructions

6.1 Monitoring Liquid Levels

After successful connection, open the "ME202W Level Sensor" interface in the app. You will see:

• **Liquid Level Ratio:** Percentage of liquid in the tank.
• **Liquid Level Depth:** Actual depth of the liquid in meters.
• **Liquid Level Status:** Indicates 'Normal', 'Lower alarm', or 'Full alarm'.
• **Supply Voltage:** Current voltage of the device.
• **History:** View historical liquid level data.

6.2 Setting Alarms and Parameters

Access the 'Setting' menu within the device interface in the app. Configure the following parameters:

1. **Liquid Maximum Depth (B):** Set the maximum height of the liquid in your tank (e.g., 5.00m). This is crucial for accurate percentage calculation.
2. **Set Max (High Level Alarm):** Set the percentage for a high liquid level alarm (e.g., 80%). When the actual liquid level (C) reaches this percentage of the maximum depth (B), a 'Full alarm' will be triggered.
3. **Set Min (Low Level Alarm):** Set the percentage for a low liquid level alarm (e.g., 20%). When the actual liquid level (C) falls below this percentage of the maximum depth (B), a 'Lower alarm' will be triggered.
4. **Level Rate (Density):** For ME202WS (Water), use 1g/cm³. For ME202DS (Diesel), use 0.85 g/cm³.

Example: If Liquid maximum depth (B) = 3m, and actual liquid level (C) = 2m, then the liquid level ratio is (2/3 * 100%) = 67%. If 'Set Max' is 60%, a 'Full alarm' would be triggered.

Figure 5: Product Features and App Functionalities

6.3 Pump Control (if applicable)

The app may offer options for 'Auto Pump Control' (on-Auto / off-Manual), 'Pump Mode' (on-Supply / off-Drainage), and 'Pump Switch' (on-Start / off-Stop). These functions allow for automated or manual control of a connected pump based on liquid levels. Refer to the app interface for specific controls and ensure proper wiring if connecting to a pump system.

6.4 Sharing Device Data

The app allows you to share water tank data with other users, enabling multiple individuals to monitor the liquid levels.

7. Maintenance

• **Regular Cleaning:** Periodically clean the sensor probe to prevent buildup that could affect accuracy. Use a soft cloth and avoid harsh chemicals.
• **Solar Panel Check:** Ensure the solar panel is clean and free from obstructions to maximize charging efficiency.
• **Connection Integrity:** Regularly check all cable connections for signs of wear or damage, especially in outdoor installations.
• **Firmware Updates:** Keep the app updated to the latest version to ensure optimal performance and access to new features.

8. Troubleshooting

• **Device Not Connecting to App:**
  • Ensure your phone and the sensor are on the same 2.4GHz WiFi network.
  • Verify the sensor's LED is flashing rapidly when attempting to pair. If not, press and hold the touch key for 5 seconds to re-enter pairing mode.
  • Check WiFi signal strength at the sensor's location (max 50m from router without obstacles).
  • Restart your router, phone, and the sensor unit.
• **Inaccurate Readings:**
  • Check if the sensor probe is clean and free from debris.
  • Verify that the 'Liquid Maximum Depth' and 'Level Rate' (density) settings in the app are correct for your tank and liquid type.
  • Ensure the sensor is properly submerged and not obstructed.
• **Solar Panel Not Charging:**
  • Ensure the solar panel is exposed to direct sunlight.
  • Check the connection between the solar panel and the sensor unit.
  • Clean the surface of the solar panel.
• **LED Light Flashes Slowly:** This indicates WiFi is not connected. Follow the network reset and connection steps (Section 5.3).
• **LED Light Flashes Every 30s:** This indicates WiFi is connected but not configured. Follow the app connection steps (Section 5.2 & 5.3).

9. User Tips

• For optimal performance, ensure the sensor is installed in a location with good 2.4GHz WiFi coverage.
• Regularly check the app for real-time data and set up push notifications for critical liquid levels to receive immediate alerts.
• Consider the specific density of your liquid (water vs. diesel) when configuring the 'Level Rate' for accurate measurements.

10. Warranty & Support

For warranty information, technical support, or service inquiries, please refer to the seller's policy or contact the manufacturer directly. Keep your purchase receipt as proof of purchase.

For additional information, you may refer to the official user manual PDF: View User Manual (PDF)

11. Regulatory Compliance

This device complies with CE certification standards.