1. Introduction
The Moray ME203W is a non-contact ultrasonic liquid level sensor designed for accurate and reliable monitoring of liquid levels in various tanks, including water, oil, and septic tanks. It features WiFi connectivity, allowing remote monitoring and control via the Tuya or Smart Life mobile application, and is compatible with smart home systems like Amazon Alexa and Google Assistant. This manual provides detailed instructions for the safe and effective use of your ME203W sensor.
2. Safety Information
- Read all instructions carefully before installation and operation.
- Ensure the power supply (5V DC) matches the sensor's requirements.
- Do not expose the sensor to extreme physical shock or temperatures outside its operating range.
- Installation should be performed by individuals familiar with basic electrical and mechanical procedures.
- Ensure the sensor is securely mounted to prevent accidental detachment.
- This device is designed for non-contact measurement; do not immerse the sensor in liquid.
3. Package Contents
Please check the package for the following items:
- Moray ME203W Ultrasonic Liquid Level Sensor
- Power Adapter (AC 110V-240V to DC 5V)
- User Manual (this document)
4. Product Overview
The ME203W sensor provides real-time liquid level data to your smartphone. Its non-contact design ensures durability and minimal maintenance.
Key Features:
- Non-contact ultrasonic measurement
- WiFi (2.4GHz) connectivity for remote monitoring
- Tuya/Smart Life APP control
- Compatible with Amazon Alexa and Google Assistant
- Strong anti-interference ability
- Explosion-proof design
- Measuring range: 0.1m to 10m
- IP65 protection rating
Description: This image highlights the main features of the Moray ME203W sensor, including Tuya/Smart Life APP compatibility, non-contact measurement, strong anti-interference, and a range of 0.1-10m.
Sensor Components:
Description: This diagram shows the physical dimensions of the ME203W sensor, including its diameter ($\phi$ 88.5mm), height (102mm, total <135.5mm), thread size (M32x1.5), and identifies the antenna and power cable connection points. It also shows the LED and Reset key location under the top cover.
5. Setup & Installation
5.1 Physical Installation
- Drill Hole: Drill a hole with a diameter of at least 33mm (or 35mm as shown in video) on the water tank cover where the sensor will be mounted.
- Insert Sensor: Remove the nut from the sensor probe. Insert the sensor probe into the drilled hole from the top of the tank cover.
- Secure Sensor: Install the nut from the underside of the tank cover and screw it to the appropriate position, ensuring the sensor is securely fastened.
- Vertical Placement: Place the sensor vertically on the tank. Ensure the sensor is perpendicular to the liquid surface.
Description: This diagram illustrates the four steps for physical installation: drilling a hole ($\ge$33mm), placing the sensor probe, vertically installing the sensor, and the final installation completion.
5.2 Installation Best Practices
- 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, otherwise it will cause a strong pseudo-echo.
Description: This image provides visual guidance on correct and incorrect sensor placement to ensure accurate readings, emphasizing perpendicularity, distance from inlets, and distance from bulkheads.
5.3 App Installation & Pairing
- Download App: Scan the QR code provided in the product packaging or search for