M04 Non-Contact Water Level Detection Module

M04 Non-Contact Water Level Detection Module is a highly reliable sensor designed for accurately detecting the presence of liquid without ever making physical contact with the fluid itself. This module utilizes advanced signal processing technology to sense capacitance changes caused by the liquid when attached to the external wall of a non-metallic container (such as plastic, glass, or ceramic). Consequently, this non-invasive method eliminates concerns regarding corrosion, contamination, or safety risks often associated with traditional submersible probes. Furthermore, the M04 module simplifies system design by offering a digital output, allowing you to easily integrate precise level monitoring into automated control systems, home appliances, and various IoT projects. Therefore, choose the M04 when you need clean, safe, and maintenance-free liquid level sensing.

Key Features:

• Non-Contact Sensing: Detects liquid level through the container wall (up to 12 mm thickness), ensuring zero fluid contact and preventing contamination.
• High Sensitivity: Optimized to detect a wide range of non-metallic liquids, offering excellent performance and responsiveness.
• Digital Output: Provides a direct digital signal (HIGH/LOW) indicating the presence or absence of liquid at the sensor’s mounting point, simplifying microcontroller interfacing.
• Wide Voltage Compatibility: Operates across a broad supply voltage range, making it compatible with both 3.3 V and 5 V logic systems.
• Strong Anti-Interference: Features enhanced circuitry to resist electrical interference and external noise, ensuring stable long-term operation.

Technical Specifications:

• Operating Voltage (V_CC): 5 V DC to 24 V DC
• Current Consumption: ≤ 5 mA
• Output Voltage (High Level): V_CC
• Output Voltage (Low Level): 0 V
• Response Time: 500 ms
• Wall Thickness Limit: ≤ 12 mm (Non-metallic materials only)
• Operating Temperature: −20°C to +105°C
• Sensor Protection: IP67 Rated (when properly installed)

Mechanical Specifications:

• Sensing Principle: Capacitive sensing
• Installation Method: Adhesion (using double-sided tape or adhesive) to the container wall.
• Housing Material: High-temperature resistant ABS plastic
• Indicators: Includes an LED to display the output status (liquid detected/not detected).

Dimensions:

• Module Diameter: ≈ 28 mm
• Module Height: ≈ 16 mm
• Cable Length: ≈ 45 cm (3-wire connection)
• Mounting: Designed for surface mounting on container wall.

Pinout and Wiring:

• Brown Wire (VCC): Connect to the positive power supply (5V to 24V DC).
• Blue Wire (GND): Connect to the circuit ground (0V).
• Black Wire (OUT): Digital Output signal. This pin provides V_CC when liquid is detected and 0 V when no liquid is detected.
• Wiring Note: Always ensure the sensor face makes full, flat contact with the clean, dry exterior surface of the container at the desired detection level.

Datasheet Reference:

• Download M04 Non-Contact Liquid Level Sensor Datasheet (Reference)

Commonly Used in:

• Vending Machines: Monitoring stock levels in drink dispensers and coffee makers.
• Humidifiers and Water Dispensers: Providing reliable low-water level alarms and automatic shutoff mechanisms.
• Aquarium and Hydroponics Systems: Maintaining precise water levels without introducing submerged electrical components.

Applications:

• High/Low Level Alarms: Triggering notifications when liquid reaches a critical point in a tank.
• Automated Refill Systems: Controlling pumps to automatically maintain a preset fluid level.
• Medical Equipment: Safely monitoring liquid volumes in non-invasive diagnostic devices.
• Chemical Processing: Detecting corrosive or highly pure liquids where metallic sensors are unacceptable.

Equivalent Models:

• XKCS-Y25 Series: A functionally similar capacitive non-contact liquid level switch that offers comparable features and performance.
• JSN-SR04T-2.0 (Note: Ultrasonic): While not capacitive, this ultrasonic sensor is commonly used for non-contact distance/level measurement from the top of the tank, however, it measures distance, not just presence.
• D-TEK M15-30: Another alternative non-contact capacitive sensor often used in industrial settings, providing a high-quality cross-reference option.

Package Includes:

• 1 x M04 Non-Contact Water Level Detection Module