ME201R Ultrasonic Wireless Water Tank Liquid Level Monitor

1. Introduction

The ME201R is a high-performance ultrasonic wireless liquid level monitor designed for water and oil tanks. It provides unattended automatic detection, high-precision liquid level measurement, and intelligent remote monitoring via the Tuya SmartLife app. The device features an LCD display for real-time data, including liquid level ratio, depth, status, temperature, and sensor power. It supports setting high and low water level alarms and offers optional pump control. Its simple design ensures easy installation and use, helping users manage tank liquid levels efficiently and safely.

2. Package Contents

Please check the box for the following items:

• ME201R Gateway/Display Unit
• Ultrasonic Sensor
• Power Adapter (AC/DC)
• USB Cable
• Mounting Screws
• User Manual (this document)

Figure 2.1: ME201R Package Contents

3. Specifications

4. Setup Guide

4.1 Physical Installation

1. Sensor Placement: Mount the ultrasonic sensor on top of your water or oil tank. Ensure the sensor is held perpendicular to the liquid surface. Avoid installing the sensor directly above the water inlet to prevent false readings from pseudo-echoes. Also, ensure the sensor is not too close to any bulkheads, which can cause strong pseudo-echoes.
2. Gateway Placement: Place the ME201R Gateway/Display Unit in a convenient location within range of your Wi-Fi network and the ultrasonic sensor (RF433MHz communication).

Figure 4.1: Sensor Installation Guidelines

Figure 4.2: System Overview

4.2 Power Connection

1. Connect the power adapter to the ME201R Gateway/Display Unit.
2. Plug the power adapter into a standard 100-240VAC outlet.
3. Connect the ultrasonic sensor to the gateway using the provided cable.

4.3 App Installation & Pairing

1. Download App: Scan the QR code in the physical manual or search for “TUYA Smart APP” or “Smart Life APP” in your mobile device’s app store (Android or iOS) and install it.
2. Power On: Ensure the Gateway and Sensor are powered on.
3. Network Reset: On the Gateway, press and hold the reset button for 5 seconds. The LED light will flash rapidly. Release the button. This initiates the network reset and prepares the device for pairing.
4. Open App: Enable Wi-Fi and Bluetooth on your smartphone. Open the Tuya Smart or Smart Life app.
5. Add Device: The app should automatically detect the new device. If not, tap “Add Device” or the “+” icon, then select “Liquid Level Monitor” or search for it.
6. Connect to Wi-Fi: Follow the in-app instructions to connect the device to your home Wi-Fi network. Enter your Wi-Fi password when prompted.
7. Confirm Connection: Once successfully added, the app will display the “Liquid Level Monitor” device. Tap “Done” to complete the pairing process.

Video 4.1: ME201R Installation and App Pairing Guide

This video demonstrates the physical connection of the sensor and gateway, power-up, and the step-by-step process of pairing the device with the Tuya Smart app, including network reset and Wi-Fi configuration.

Figure 4.3: App Pairing Process

5. Operating Instructions

5.1 Monitoring Liquid Level

Once set up, you can monitor the liquid level through the Gateway's LCD display or the mobile app.

• Gateway Display: The LCD screen on the gateway shows real-time data including battery level, Wi-Fi status, pump status, sensor connection, current liquid level percentage, and environmental temperature.
• Mobile App: The Tuya SmartLife app provides a detailed interface showing liquid level ratio, liquid level depth, liquid level status (Normal, Full alarm, Lower alarm), temperature, and sensor power. It also offers historical data viewing.

Figure 5.1: Gateway Display Interface

Figure 5.2: Mobile App Monitoring Interface

5.2 Setting Alarms

The device supports setting high and low liquid level alarms. You can configure these settings within the Tuya SmartLife app:

1. Open the app and select your Liquid Level Monitor device.
2. Navigate to the settings section (often represented by a gear icon).
3. Look for options like "Set Max" and "Set Min" to define your desired high and low alarm thresholds (e.g., 80% for max, 20% for min).
4. You can also enable/disable a beep alarm for local notification.

Figure 5.3: Water Level Alarm Display in App

5.3 Multi-Tank Monitoring

If you have multiple ME201R units, you can monitor them all from a single Tuya SmartLife account. Each sensor will appear as a separate device in your app's device list, allowing you to track liquid levels in various tanks simultaneously.

Figure 5.4: Multi-Tank Monitoring in App

5.4 Pump Control (Optional)

The ME201R offers optional pump control features, allowing you to automate liquid transfer based on tank levels. This can be configured in the app:

1. In the device settings, look for "Auto Pump Control" to enable or disable automatic operation.
2. Set the "Pump Mode" to either "Supply" (to fill the tank when low) or "Drainage" (to empty the tank when full).
3. You can also manually control the pump using the "Pump Switch" option (Start/Stop).

Figure 5.5: Pump Control Settings

6. Maintenance

• Cleaning: Periodically clean the sensor head to ensure accurate readings. Use a soft, damp cloth. Do not use abrasive cleaners or solvents.
• Power Supply: Ensure a stable power supply (100-240VAC to DC 5V) to the gateway for continuous operation.
• Firmware Updates: Check the Tuya SmartLife app regularly for any available firmware updates for your device to ensure optimal performance and access to new features.

7. Troubleshooting

• No Reading/Inaccurate Reading:
  • Check sensor placement: Ensure it's perpendicular to the liquid, away from inlets, and not too close to bulkheads (refer to Figure 4.1).
  • Verify sensor connection to the gateway.
  • Ensure the sensor head is clean and free from obstructions.
• Gateway Not Connecting to Wi-Fi:
  • Perform a network reset on the gateway (press and hold the button for 5 seconds).
  • Ensure your Wi-Fi network is 2.4GHz (most smart home devices require this).
  • Check your Wi-Fi password in the app.
  • Move the gateway closer to your Wi-Fi router.
• App Not Displaying Data:
  • Ensure the gateway is connected to Wi-Fi and the sensor is connected to the gateway.
  • Check your phone's internet connection.
  • Restart the app or your phone.
• Alarms Not Triggering:
  • Verify that alarm thresholds are correctly set in the app.
  • Ensure app notifications are enabled on your phone and for the Tuya SmartLife app.

8. User Tips

• Optimal Range: The sensor has a measuring range of 0.1m to 4.0m. Ensure your tank's liquid level falls within this range for accurate monitoring.
• Fast Connection: Users have reported fast connection times and accurate water level measurements, making initial setup and ongoing monitoring efficient.
• Regular Checks: Although the system provides remote monitoring and alarms, occasional visual checks of your tank and device can help ensure everything is functioning as expected.

9. Warranty and Support

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