Model Selection Guide
Please choose the corresponding output protocol model based on your controller or PLC requirements:
| Model | Specification | Output Description |
|---|---|---|
| DS1603L | UART Serial Port | TTL-UART digital serial output for MCU/Arduino/Raspberry Pi integration. |
| DS1603-AQ | Analog Output | Proportional analog voltage output for analog signal collection. |
| DS1603NF | Normally Open (NO) | Relay output with Normally-Open contact for liquid level switch control. |
| DS1603NFK | Normally Closed (NC) | Relay output with Normally-Closed contact for safety/alarm logic circuits. |
| DS1603DA-RS485 | RS485 Interface | RS485 Modbus industrial communication for long-distance PLC/SCADA systems. |
| L023MPNW | Low-Voltage Analog Output | Low-voltage version operating at 2.8V – 5V power supply with analog output. |
Non-Contact Ultrasonic Liquid Level Sensor Module (DS1603 Series)
The DS1603 Series Non-Contact Ultrasonic Liquid Level Sensor provides high-precision, non-invasive liquid depth detection without drilling holes or altering your container structure. Mounted directly to the bottom or outer wall of the vessel, it emits ultrasonic pulses through the container material to accurately measure real-time liquid levels.
Equipped with built-in temperature compensation, it automatically adjusts measurement values according to environmental changes, making it an ideal choice for smart home automation, water tank level monitoring, and industrial liquid management.
Key Features
- Non-Invasive Measurement: Attaches externally to the tank bottom. Zero contact with liquid ensures anti-corrosion, clean, and leak-free operation.
- Built-in Temperature Compensation: Ensures stable accuracy across varying temperature environments.
- Real-Time Continuous Tracking: Supports dynamic tracking. No system restart is required when filling an empty tank.
- Multiple Output Interfaces: Available in UART (DS1603L V1.0), RS485 (DS1603DA V1.0), and Analog Voltage (DS1603AQ V1.0) versions for flexible MCU and PLC integration.
⚠️ Critical Operating & Tank Compatibility Requirements
To ensure reliable ultrasound penetration and accurate measurements, please verify that your application meets all of the following conditions prior to installation:
- Container Material & Thickness: Must be an integrated/seamless metal container wall with a thickness between 0.5 mm and 5.0 mm.
- Surface Condition: The probe mounting area on the container wall must be free of paint, rust, coating, or heavy oxide layers (clean metal surface required).
- Container Size / Pipe Diameter:
- For tanks/containers: Outer diameter must not exceed 2 meters.
- For pipes: Outer diameter must be larger than 15 cm.
- Liquid Purity: The measured liquid should be clear with low impurity/sediment levels to prevent sound wave scattering.
- Internal Obstructions: The interior acoustic path must be unobstructed (hollow) and contain liquid only (no internal baffles, mixers, or bubbles).
- Operating Temperature: Maximum liquid/vessel temperature must not exceed 60°C (140°F).
Technical Specifications
| Parameter | DS1603L V1.0 | DS1603DA V1.0 | DS1603AQ V1.0 |
|---|---|---|---|
| Operating Voltage | DC 3.3V – 12V | DC 10V – 36V | DC 10V – 36V |
| Detection Range | 5 cm – 200 cm | 5 cm – 200 cm | 5 cm – 100 cm |
| Output Signal | UART Output | RS485 Output | Analog Voltage Output |
| Measurement Accuracy | ±(5 + S * 0.5%) mm | ±(5 + S * 1.0%) mm | ±(10 + S * 1.0%) mm |
| Dimensions | Probe Diameter: 27.7mm ± 0.5mm | Height: 17mm ± 1mm | Cable Length: 450mm ± 10mm | ||
* Note: S represents the current detected liquid level height in millimeters.
Applications
- Smart home appliance liquid monitoring (e.g., water dispensers, coffee machines)
- Water tank & storage container level management
- High-risk liquid level detection & automated pump control (High/Low limit control)
- DIY electronics & industrial automation projects
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