QDY30A Submersible Liquid Level Sensor

1. Introducció

The QDY30A submersible liquid level sensor is designed for accurate and reliable measurement of liquid levels in various industrial applications. Constructed with 304 & 316 stainless steel and featuring a hermetically sealed housing, it is suitable for most industrial liquids and oils. The sensor's welded housing undergoes in-house helium leak testing to ensure robust protection against environmental factors. A ventilation tube integrated into the cable automatically compensates for changes in atmospheric pressure, ensuring consistent accuracy. The cable conductors are also isolated from the outside environment to maintain long-term operational integrity.

Figure 1: QDY30A Submersible Level Sensor in liquid, highlighting its 19mm probe and 4-20mA output.

2. Característiques

• Alta precisió: Provides precise liquid level measurements.
• Alta sensibilitat: Capable of detecting subtle changes in liquid levels.
• Good Stability: Ensures consistent and reliable performance over time.
• Construcció robusta: All stainless steel structure probe for durability.
• Anticorrosió: Optional anti-corrosion materials available for diverse media.
• Fàcil instal·lació: Dissenyat per a una configuració senzilla.
• Protecció IP68: Shell is resistant to dust and water, ensuring operation in harsh environments.
• Enhanced Waterproofing: All-tube injected with silicone gel for superior waterproof performance.
• Cable resistent: External cable material made of PU and NBR to protect internal wires and extend service life.
• Atmospheric Pressure Compensation: Built-in vent cable balances atmospheric pressure for more accurate measurements.
• Inner Core Protection: Adopts a potting and packaging process to prevent water droplets from invading the sensor's core.
• Double Protection Connection: Probe and cable feature a double protection connection to prevent intrusion of foreign objects, dust, and damage during use.

Figura 2: Detallada view of the QDY30A sensor's internal structure, highlighting its anti-leakage and anti-corrosion design.

Figure 3: The QDY30A sensor with its protective cap removed, revealing the internal components.

3. Aplicacions

The QDY30A submersible liquid level sensor is versatile and suitable for a wide range of applications, including:

• Agricultural irrigation systems
• Petroleum industry
• Processament químic
• Power generation plants
• Urban water drainage systems
• Hydrographic surveys
• Environmental protection initiatives
• Hydraulic monitoring in rivers and seas
• Sewage treatment facilities
• Control de processos industrials
• Dam monitoring for hydraulic applications
• Indústria petroquímica
• Deep well level measurement

Figura 4: Examples of the QDY30A sensor in various real-world applications, such as river level monitoring and drilling projects.

4. Especificacions

Figure 5: Comprehensive technical parameters for the QDY30A liquid level sensor.

5. Configuració

5.1 Model Configuration (Ordering Guide)

When ordering or setting up the sensor, ensure the correct parameters are selected based on your application requirements. The model configuration follows this format:

QDY30A - [Measuring Range] - [Output Signal] - [Power Supply] - [Cable Length]

• Interval de mesura: Specify the desired range (e.g., 0-0.5m H2O up to 500m H2O).
• Senyal de sortida: Select from O1: 4-20mA, O2: 0-5V, O3: 1-5V, O4: 0-10V, O5: RS485.
• Font d'alimentació: Choose from P1: 12VDC, P2: 24VDC, P3: ±12VDC.
• Longitud del cable: Specify in meters (e.g., Lm: 5m).

Figure 6: Visual guide for configuring the QDY30A sensor model based on specific parameters.

5.2 Mètodes d'instal·lació

The QDY30A sensor can be installed using a cable hanger or a fixed flange, depending on the application and tank design. A blind area of approximately 20mm should be considered for both installation types.

5.2.1 Cable Hanger Installation

For this method, the sensor is suspended into the liquid using a cable hanger. The hanger material is 304 stainless steel, and the locking core is made of engineering plastic. Ensure the cable is securely attached to the hanger and the sensor is positioned correctly within the liquid.

5.2.2 Flange Fixed Installation

In this method, the sensor is fixed to the tank using a flange. This provides a more rigid and permanent installation. Ensure the flange is properly sealed to prevent leaks and the sensor is securely mounted.

Figure 7: Diagrams illustrating both cable hanger and flange fixed installation methods for the QDY30A sensor.

6. Instruccions de funcionament

6.1 Esquemes de cablejat

Proper wiring is crucial for the correct operation of the QDY30A sensor. Refer to the specific wiring diagram below based on your chosen output signal type.

6.1.1 Current Output (2 wires)

Connect the Red cable to V+ (positive power supply) and the Blue cable to V- (negative power supply/device input). The device (A) will read the current output.

6.1.2 voltage Output (3 wires)

Connect the Red cable to V+ (positive power supply), the Green cable to V- (negative power supply), and the Yellow cable to the 'out' terminal of your device (A). The device will read the voltage sortida.

6.1.3 RS485 Output (4 wires)

Connect the Red cable to V+ (positive power supply), the Green cable to V- (negative power supply), the Blue cable to A (RS485 data line A), and the Yellow cable to B (RS485 data line B). Connect these to your PC or RS485 compatible device.

Figure 8: Detailed wiring instructions for 2-wire current, 3-wire voltage, and 4-wire RS485 output configurations.

6.2 Level Monitoring and Control

The QDY30A sensor can be integrated into a comprehensive level monitoring and control system. The sensor provides a level signal input to a controller. Based on predefined settings and contact signals, the controller can then activate or deactivate devices such as a water pump or a valve to maintain desired liquid levels.

Figure 9: Diagram illustrating how the QDY30A sensor integrates into a level monitoring and control system to manage liquid levels.

7. Manteniment

To ensure the longevity and accurate performance of your QDY30A submersible liquid level sensor, follow these maintenance guidelines:

• Inspecció periòdica: Periodically inspect the sensor probe and cable for any signs of physical damage, wear, or corrosion.
• Neteja: Ensure the sensor probe is free from excessive buildup of debris, sediment, or other contaminants that could affect measurement accuracy. Clean gently if necessary, using methods compatible with stainless steel.
• Vent Cable Check: Verify that the vent cable (integrated into the main cable) is clear and unobstructed. A blocked vent cable can lead to inaccurate readings due to improper atmospheric pressure compensation.
• Integritat del cable: The external cable material (PU and NBR) is designed for durability. However, avoid sharp bends, excessive pulling, or exposure to extreme mechanical stress that could compromise the internal wiring.
• Punts de connexió: Ensure all electrical connections are secure and free from moisture or corrosion.
• Compatibilitat ambiental: Confirm that the liquid medium remains compatible with SS304 stainless steel to prevent premature corrosion.

8. Solució De Problemes

If you encounter issues with your QDY30A sensor, consider the following troubleshooting steps:

• No Output/Incorrect Readings:
  • Comproveu la font d'alimentació: Ensure the sensor is receiving the correct power supply (e.g., DC24V, DC10-36V) as per specifications.
  • Verifiqueu el cablejat: Double-check all wiring connections against the appropriate wiring diagram (Figure 8) for your output type (2-wire current, 3-wire voltage, or 4-wire RS485).
  • Inspeccionar el cable: Look for any visible damage to the cable that might interrupt the signal.
  • Clear Vent Cable: Ensure the vent tube in the cable is not blocked, as this can cause pressure inaccuracies.
  • Col·locació del sensor: Confirm the sensor is fully submerged and positioned correctly within the liquid, considering the 20mm blind area.
• Mesures inexactes:
  • Calibració: If possible, verify the sensor's calibration against a known reference.
  • Contaminació: Clean the sensor probe if there is any buildup of foreign material.
  • Medium Compatibility: Ensure the liquid being measured is compatible with the sensor's materials (SS304).
  • Efectes de la temperatura: Verify that the operating temperature is within the specified range (-40 ~ 80°C).
• Lectures intermitents:
  • Connexions soltes: Check for any loose wiring connections.
  • Interferència elèctrica: Ensure the sensor and its wiring are not exposed to strong electromagnetic interference.

9. Consells d'usuari

• Order Correct Cable Length: Always specify a cable length that is sufficient for your application, allowing for proper installation and potential future adjustments without strain.
• Match Output Signal: Ensure the selected output signal (e.g., 4-20mA, RS485) is compatible with your existing control system or data acquisition equipment.
• Verify Medium Compatibility: Before deployment, confirm that the liquid you intend to measure is compatible with 304 stainless steel to prevent corrosion and ensure long-term sensor integrity.
• Consider Blind Area: Account for the approximately 20mm blind area at the bottom of the sensor when determining the minimum measurable liquid level.

10. Garantia i Suport

For information regarding product warranty, technical support, or service, please contact your vendor or the manufacturer, QiDian Tech Store, directly. Keep your purchase records handy for any warranty claims.