1. Product Description
The CERTEON Multi-Layer Soil Moisture, Temperature, and EC Sensor RS485 is a robust device designed for precise monitoring in agricultural and environmental applications. This sensor accurately measures soil moisture, temperature, and electrical conductivity (EC) at multiple depths. Depending on the specific configuration, it may also offer optional nutrient monitoring for nitrogen (N), phosphorus (P), and potassium (K).
The sensor utilizes RS485 communication with the Modbus-RTU protocol, ensuring compatibility with a wide range of data logging and control systems. Its IP68 waterproof rating and durable construction make it suitable for long-term buried deployment in various soil types and conditions.
2. Specifications
| Parameter | Specification |
|---|---|
| Power Supply | DC 5-30V |
| Max Power Consumption | 1.1W @ 12V |
| Operating Temperature | -40 ~ +80°C |
| EC Measurement Range | 0-20000 µS/cm |
| EC Resolution | 10 µS/cm |
| EC Accuracy | ±3% FS (0-10000 µS/cm), ±5% FS (10000-20000 µS/cm) |
| Moisture Measurement Range | 0-100% |
| Moisture Resolution | 0.1% |
| Moisture Accuracy | ±2% (0-50%), ±3% (50-100%) |
| Temperature Range | -40 ~ +80°C |
| Temperature Resolution | 0.1°C |
| Temperature Accuracy | ±0.5°C @ 25°C |
| EC Temperature Compensation | Built-in, 0-50°C |
| Output Signal | RS485 (Modbus-RTU) |
| Waterproof Rating | IP68 |
| Probe Material | Anti-corrosion special electrode (Austenitic 316 Stainless Steel) |
| Seal Material | Flame-retardant black epoxy resin |
| Default Cable Length | 1 meter (customizable) |
| Layer Configuration | 3-layer or 5-layer standard, up to 20 layers customizable |
| Layer Spacing | 10 cm or 20 cm customizable |
| Battery Included | No |
| High-concerned chemical | None |
3. Package Contents
The standard package includes:
- CERTEON Multi-Layer Soil Sensor Probe
- Connection Cable (1 meter, customizable length available)
- Documentation (User Manual, etc.)
4. Installation
Before installation, ensure the supply voltage is within the specified range (DC 5-30V) and that the cable and connectors are intact. Confirm the required number of sensing layers and desired spacing (10cm or 20cm) for your application.
4.1. Site Selection
Choose a representative soil location that is free from large stones and sources of strong electromagnetic interference. This ensures accurate and reliable measurements.
4.2. Installation Method One: Vertical Pit Method
- Dig a vertical pit with a diameter of approximately 8 cm to the desired depth.
- At the predetermined depth, insert the sensor's steel probes horizontally into the pit wall. Ensure full contact between the sensing sections and the surrounding soil.
- Firmly backfill the pit, compacting the soil around the sensor.
- After a period of stabilization, continuous measurement and recording can be carried out.
4.3. Installation Method Two: Auger Method (Optional)
- Hold the auger vertically on the ground, grip the handle with both hands, and rotate it clockwise while gently pressing downward. (Note: Do not apply excessive force; rotate slowly several times to avoid deviation or drilling into hollow areas).
- Remove the auger from the hole and place the soil from the auger into a bucket. (Note: Do not collect the first batch of soil due to excessive impurities).
- Repeat the above drilling and soil collection steps, and during the process, try placing the sensor into the hole (do not forcefully press the device to the bottom). If resistance is encountered, use the auger to adjust and ensure smooth insertion and removal of the sensor. Make sure the hole depth aligns with the installation mark on the sensor to complete the drilling.
Important Notes for Installation:
- Avoid bending or applying excessive force to the probe during insertion to prevent damage.
- Ensure full contact between the sensor's sensing sections and the surrounding soil for accurate readings.
- For multi-layer configurations, ensure correct depth placement for each sensing point.
- Recommended 10 cm interval for herbaceous plants such as wheat, corn, and rice paddies.
- Recommended 20 cm interval for woody plants such as apple trees, peach trees, and citrus trees.
5. Wiring Instructions
The sensor uses an RS485 interface for communication. Connect the sensor to a compatible RS485 host device (e.g., data logger, controller) ensuring correct wiring polarity.
| Category | Wire Color | Description |
|---|---|---|
| Power | Brown | Power Positive (5~30V DC) |
| Black | Power Negative | |
| Communication | Yellow | 485-A |
| Blue | 485-B |
Note: The communication parameters (e.g., baud rate, data bits, stop bits, parity) of your host device must be configured to match the Modbus-RTU protocol used by the sensor.
6. Operation
Once the sensor is physically installed and correctly wired, power on the system. Allow a stabilization period for the sensor to acclimate to the soil conditions before collecting data. This ensures the most accurate initial readings.
Measurements can be read through your connected controller or data logger. Data should be collected and analyzed at regular intervals to monitor trends in soil moisture distribution, salinity levels, and temperature variations across different depths. This data can be visualized and exported using compatible software or cloud platforms.
7. Storage and Maintenance
- Cleaning: Clean the probe using a soft, damp cloth after use. Avoid corrosive cleaning agents and abrasive materials, as these can damage the sensor.
- Inspection: Regularly inspect the cable and sealing components for any signs of wear or damage.
- Storage: Store the device in a dry and well-ventilated environment when not in use.
- Long-term Storage: Disconnect the sensor from power during long-term storage.
- Pre-use Check: Verify the functionality of the sensor before reuse after storage.
8. Troubleshooting
- No Readings/Incorrect Readings:
- Check power supply: Ensure the sensor is receiving the correct DC 5-30V power.
- Verify wiring: Confirm all wires are connected correctly according to the wiring diagram (Figure 7) and polarity is correct.
- Check communication: Ensure the Modbus-RTU communication parameters (baud rate, etc.) on your host device match the sensor's settings.
- Sensor contact: Make sure the sensor probes have full and firm contact with the soil. Poor contact can lead to inaccurate moisture and EC readings.
- Environmental interference: Avoid installation near strong electromagnetic interference sources.
- Sensor Damage:
- Physical damage: Inspect the probe and cable for any visible damage. Avoid applying excessive force during installation or pulling the device by its cable.
- Water ingress: Although IP68 rated, ensure proper installation and sealing to prevent long-term water ingress, especially in submerged applications.
- EC Readings Fluctuate:
- Soil composition: EC readings can be influenced by soil composition and fertilizer content. Ensure consistent soil conditions for comparative readings.
- Temperature compensation: The sensor has built-in temperature compensation for EC (0-50°C), but extreme temperature fluctuations outside this range might affect accuracy.
9. User Tips
- Irrigation Management: Utilize the soil moisture readings to optimize irrigation schedules. Monitoring soil conditions in the field can help manage irrigation more effectively, preventing over- or under-watering.
- Data Analysis: Regularly analyze the collected data to identify trends in soil parameters. This can help in understanding plant water stress, nutrient availability, and overall soil health over time.
- Customization: Take advantage of the customizable layer configurations and spacing to tailor the sensor's monitoring to your specific crop or soil profile needs.
10. Safety Precautions and Warnings
- Intended Use: This device is intended for professional agricultural and environmental monitoring use only.
- Voltage Range: Operate the sensor only within the specified voltage range (DC 5-30V) to prevent device damage.
- Handling: Do not pull or lift the device by its cable. The probe contains sharp metal parts; protective gloves are recommended during handling and installation.
- Installation/Wiring: Do not perform installation or wiring while the device is powered. Ensure connectors remain clean and properly sealed during operation to prevent moisture ingress and short circuits.
- Critical Systems: Do not use this device as a safety-critical system.
- Environmental Limits: Do not exceed the specified operating temperature range (-40 ~ +80°C).
- Children: Keep out of reach of children.
- Disposal: Dispose of the product according to WEEE directives for electronic waste.
11. Warranty and Support
For technical consultations, support, or inquiries regarding customized products, please contact us:
- WhatsApp: +86 19542723588
- Email: celiachen008@gmail.com
Manufacturer: SHANGHAI CHIKONG AUTOMATION INSTRUMENT CO., LTD
12. Frequently Asked Questions (FAQs)
- Q1: How do I install the soil sensor properly?
- A: You can use one of two methods: the Vertical Pit Method (dig a vertical hole, insert the probe horizontally into the side wall at the desired depth, then refill and compact the soil) or the Auger Method (use an auger to create a hole and carefully insert the sensor). Ensure full contact between the sensor and soil for accurate readings.
- Q2: Can this sensor be used underwater or in flooded soil?
- A: Yes. With its IP68 protection rating and epoxy-sealed stainless steel housing, the sensor is designed for extended submersion and long-term dynamic monitoring in liquid solutions or flooded soil conditions.
- Q3: Is the cable length customizable?
- A: Yes. The standard cable length is 1 meter, but custom lengths are available upon request to suit your specific installation requirements.
- Q4: Does this sensor measure by resistance, TDR, or FDR?
- A: The sensor measures soil moisture, temperature, and electrical conductivity (EC). Soil moisture is typically measured using capacitance-based methods (similar to FDR), while EC is measured by electrical resistance. It does not explicitly use Time-Domain Reflectometry (TDR).
- Q5: What parameters can be customized?
- A: You can customize the number of sensing layers (up to 20), the spacing between layers (10 cm or 20 cm), and potentially other monitoring parameters like NPK, depending on the specific model and your needs. A solar-powered option is also available for the power supply.