1. Introduction
The ZEEGII QDY30A-B submersible liquid level sensor is designed for accurate and reliable liquid level measurement in various industrial applications, including rivers, deep wells, and tanks. Its robust construction, featuring 304 and 316 stainless steel and a hermetically sealed housing, ensures suitability for most industrial liquids. The cable conductors are isolated from the external environment, contributing to the sensor's long-term operational stability.
Image 1.1: Overview of the ZEEGII QDY30A-B Liquid Level Sensor, showing its stainless steel body and integrated cable.
2. Features
- Material: Constructed from anti-corrosion materials, including 304 and 316 stainless steel, with a waterproof cable for enhanced durability.
- Design: Features an anti-bending, solid structure for high reliability. The anti-blocking design and detachable probe facilitate easy cleaning and maintenance.
- Performance: Equipped with a full digital conditioning circuit, providing a stable 4-20mA signal output for reliable and consistent readings.
- Durability: IP68 multi-layer waterproof protection ensures the sensor can withstand harsh environments, extending its service life.
3. Setup and Installation
Proper installation is crucial for the accurate and reliable operation of the QDY30A-B liquid level sensor.
- Mounting: Submerge the sensor into the liquid to be measured. Ensure the sensor is positioned vertically and securely to prevent movement due to liquid flow or turbulence.
- Cable Routing: Route the waterproof cable away from potential damage or interference. Secure the cable at appropriate intervals to prevent strain on the sensor connection.
- Wiring: Connect the sensor's output cable to your control system or display unit. For the 4-20mA output model, ensure correct polarity and connection to a compatible input. Refer to the wiring diagram provided with your specific unit for detailed connections.
- Power Supply: Connect the sensor to a stable DC 24V power supply. Verify the power supply meets the sensor's requirements to ensure optimal performance.
Image 3.1: The liquid level sensor with its coiled cable, ready for deployment and connection.
4. Operating Instructions
Once installed and powered, the QDY30A-B sensor continuously measures the liquid level. The sensor converts the hydrostatic pressure of the liquid into an electrical signal (4-20mA) that is proportional to the liquid depth.
- Signal Output: The sensor provides a 4-20mA current output. A 4mA signal typically corresponds to the minimum measured level (e.g., empty or lowest point of measurement), while 20mA corresponds to the maximum measured level (e.g., full or highest point of measurement).
- Monitoring: Connect the 4-20mA output to a PLC, data logger, or display unit capable of interpreting this signal. Calibrate your receiving device to accurately convert the current signal into a liquid level reading (e.g., centimeters, meters).
- Environmental Considerations: Ensure the operating environment remains within the sensor's specified temperature and pressure limits for accurate readings.
5. Maintenance
Regular maintenance helps ensure the longevity and accuracy of your liquid level sensor.
- Cleaning: The sensor features an anti-blocking design and a detachable probe, making it easy to clean. Periodically remove the sensor from the liquid and clean any accumulated debris or sediment from the sensor tip and pressure port. Use a soft brush and mild cleaning solution if necessary, then rinse thoroughly with clean water.
- Cable Inspection: Regularly inspect the sensor cable for any signs of wear, cuts, or damage. Ensure the waterproof integrity of the cable is maintained.
- Connection Check: Verify that all electrical connections remain secure and free from corrosion.
Image 5.1: Close-up view of the sensor's tip, highlighting the pressure port and anti-blocking design for easy cleaning.
6. Troubleshooting
If you encounter issues with your QDY30A-B liquid level sensor, consider the following troubleshooting steps:
- No Output Signal:
- Check power supply: Ensure the sensor is receiving the correct DC 24V power.
- Verify wiring: Confirm all cable connections are correct and secure, paying attention to polarity for the 4-20mA output.
- Inspect cable: Look for any visible damage to the sensor cable.
- Incorrect or Unstable Readings:
- Clean sensor tip: Remove any debris or sediment from the pressure port.
- Check for air bubbles: Ensure no air bubbles are trapped around the sensor's pressure port when submerged.
- Verify calibration: Ensure your receiving device (PLC, display) is correctly calibrated to interpret the 4-20mA signal.
- Environmental factors: Confirm the liquid temperature and density are within expected operating parameters.
- Sensor Not Submerged: Ensure the sensor is fully submerged to the desired measurement depth.
If problems persist after performing these checks, contact ZEEGII customer support for further assistance.
7. Specifications
| Specification | Value |
|---|---|
| Model Number | QDY30A-B |
| Brand | ZEEGII |
| Output Signal | 4-20mA |
| Power Supply | DC 24V |
| Measurement Range | 500cm (5 meters) |
| Material | 304 & 316 Stainless Steel |
| Protection Rating | IP68 |
| Item Weight | 1.76 pounds |
| Package Dimensions | 1.18 x 0.79 x 0.39 inches |
| Assembly Required | No |
Image 7.1: The sensor with a visible label indicating specifications such as output (4-20mA), power (DC 24V), and range (e.g., 0-5M).
8. Warranty and Support
Information regarding product warranty and specific support contacts was not provided in the available product data. Please refer to the product packaging or the manufacturer's official website for the most current warranty details and customer support options.
