1. Introduction
The ZEEGII QDY30A-B submersible liquid level sensor is designed for precise and reliable measurement of liquid levels in various industrial applications, including rivers, deep wells, and tanks. Constructed from durable 304 and 316 stainless steel, its hermetically sealed housing ensures suitability for most industrial liquids.
This sensor features a robust design with excellent anti-corrosion properties and a waterproof cable, ensuring long-term operational stability. The conductors of the cable are isolated from the outside environment to maintain sensor integrity over extended use. Equipped with a full digital conditioning circuit, it provides a stable 4-20mA signal output for consistent and accurate readings.
2. Product Overview
The QDY30A-B liquid level sensor is characterized by its anti-bending, solid structure, and high reliability. Its anti-blocking design facilitates easy cleaning and maintenance. The sensor is rated IP68 for multi-layer waterproof protection, allowing it to withstand harsh environments and ensuring a long service life.
Figure 1: Overall view of the ZEEGII QDY30A-B Liquid Level Sensor, showing the stainless steel body and coiled cable.
3. Setup and Installation
3.1 Safety Precautions
- Ensure power is disconnected before installation or maintenance.
- Handle the sensor carefully to avoid physical damage.
- Verify proper wiring to prevent electrical hazards and sensor damage.
3.2 Mounting
- Select an appropriate location in the liquid container (river, well, tank) where the sensor can be fully submerged and measure the desired range.
- Securely suspend the sensor using its cable or a suitable mounting bracket, ensuring it hangs vertically and does not touch the bottom or sides of the container, which could affect readings.
- Ensure the cable is routed safely, avoiding sharp edges or areas where it could be damaged.
3.3 Wiring
The QDY30A-B sensor provides a 4-20mA output signal. Connect the sensor to a compatible power supply and control system as follows:
- Power Supply: Connect the sensor to a stable DC power source (typically 24V DC, as indicated on some product labels).
- Signal Output: Connect the 4-20mA output wires to your PLC, display meter, or data acquisition system. Refer to the wiring diagram provided with your specific unit for exact color codes.
Figure 2: The sensor with its wiring exposed, showing the red and blue wires for connection to power and signal output.
4. Operating Instructions
- Power On: After completing the wiring, apply power to the sensor.
- Signal Interpretation: The sensor will immediately begin transmitting a 4-20mA current signal proportional to the liquid level. A 4mA output typically corresponds to the minimum measured level (e.g., empty), and 20mA corresponds to the maximum measured level (e.g., full).
- Monitoring: Use your connected display or control system to monitor the liquid level based on the received 4-20mA signal.
- Calibration (Optional): If precise calibration is required, follow the instructions for your specific control system to match the 4mA and 20mA outputs to your desired minimum and maximum liquid levels.
5. Maintenance
Regular maintenance ensures the longevity and accuracy of your QDY30A-B liquid level sensor.
- Probe Cleaning: The sensor's probe is detachable and features an anti-blocking design, making it easy to clean. Periodically remove the sensor from the liquid and clean any accumulated debris or sediment from the probe tip to ensure accurate readings.
Figure 3: Close-up view of the sensor's probe, highlighting its anti-blocking design for easy cleaning.
- Cable and Housing Inspection: Regularly inspect the sensor cable and housing for any signs of wear, cuts, or damage. Ensure the waterproof integrity is maintained.
- Connection Check: Verify that all electrical connections remain secure and free from corrosion.
6. Troubleshooting
If you encounter issues with your liquid level sensor, refer to the following troubleshooting guide:
| Problem | Possible Cause | Solution |
|---|---|---|
| No output signal (0mA) | No power, incorrect wiring, damaged cable/sensor | Check power supply, verify wiring connections, inspect cable for damage. |
| Inaccurate or fluctuating readings | Debris on probe, improper installation depth, electrical interference, sensor malfunction | Clean the probe, ensure correct submersion, check for strong electromagnetic fields, recalibrate if necessary. |
| Output stuck at 4mA or 20mA | Sensor not submerged (4mA), sensor fully submerged beyond range (20mA), wiring issue, sensor fault | Verify liquid level relative to sensor range, check wiring, test sensor in a controlled environment. |
7. Specifications
- Model:
- QDY30A-B
- Output Signal:
- 4-20mA
- Material:
- 304 & 316 Stainless Steel
- Waterproof Rating:
- IP68
- Typical Range:
- 500cm - 600cm (variant dependent)
- Item Weight:
- 1.76 pounds
- Package Dimensions:
- 1.18 x 0.79 x 0.39 inches
- Manufacturer:
- ZEEGII
8. Warranty and Support
For warranty information, technical support, or service inquiries, please contact your retailer or the manufacturer directly. Keep your purchase receipt for any warranty claims.
