Product Overview
The OHTS1024 is an integrated multi-parameter sensor designed for comprehensive soil monitoring. This advanced device simultaneously measures soil temperature, soil volumetric water content (VWC), soil electrical conductivity (EC), and soil pH value, providing a complete solution for agricultural and environmental monitoring applications.
The sensor employs Frequency Domain Reflectometry (FDR) principle for accurate soil moisture measurement, directly reflecting actual soil water content with minimal influence from soil texture variations. For temperature detection, the OHTS1024 utilizes platinum resistance thermometer (PT1000) technology with integrated zero-drift compensation and temperature compensation circuits. The electrical conductivity measurement uses durable 316L stainless steel probes suitable for various soil solution environments, while the pH measurement employs the reliable glass electrode method.
Featuring an RS485 digital output interface with standard Modbus-RTU communication protocol support, the OHTS1024 easily integrates with various data acquisition devices and IoT platforms. Its fully sealed structural design with IP68 ingress protection rating makes it ideal for long-term buried in-situ monitoring applications in demanding agricultural environments.
Features
- Four-Parameter Integration: Simultaneously measures soil temperature, volumetric water content, electrical conductivity, and pH value in a single device
- FDR Technology: Soil moisture measurement based on Frequency Domain Reflectometry principle, providing direct reflection of actual soil water content
- Precision Temperature Sensing: PT1000 platinum resistance element with advanced compensation circuits for high-accuracy temperature detection
- Robust Construction: 316L stainless steel probes for electrical conductivity measurement, adaptable to various soil solution environments
- IP68 Protection: Fully sealed structural design with epoxy resin sealing, suitable for long-term buried soil applications
- Fast Response: Measurement response time less than 1 second, with 3 seconds stabilization time after power-on
- Universal Compatibility: Standard Modbus-RTU protocol output compatible with various data acquisition devices and agricultural IoT systems
- Wide Applicability: Minimal soil texture influence, suitable for multiple soil types and environmental conditions
Applications
The OHTS1024 soil multi-parameter sensor is designed for diverse applications including:
- Water-saving agricultural irrigation systems and smart farming
- Meteorological and environmental monitoring stations
- Greenhouse environment control systems for precision cultivation
- Soil moisture rapid detection and monitoring networks
- Grassland and pasture ecological monitoring
- Precision cultivation of flowers and vegetables
- Plant cultivation scientific research projects
- Soil physicochemical property experiments
- Agricultural Internet of Things (IoT) data acquisition nodes
- Environmental monitoring network infrastructure
Technical Specifications
| Parameter | Specification | Remarks |
|---|---|---|
| Measured Parameters | Soil Temperature, Soil Volumetric Water Content, Soil Electrical Conductivity, Soil pH Value | - |
| Temperature Range | -30 ~ 70°C | Customizable to 0 ~ 50°C or other ranges |
| Temperature Accuracy | ±0.2°C | - |
| Temperature Resolution | 0.1°C | - |
| Moisture Range | 0 ~ 100% (m³/m³) | Customizable to specific ranges such as 30%, 50%, etc. |
| Moisture Accuracy | ±2% (m³/m³) | Within 0 ~ 50% (m³/m³) range |
| Moisture Resolution | 0.1% | - |
| Conductivity Range | 0 ~ 2000 μS/cm, 0 ~ 10000 μS/cm, 0 ~ 20000 μS/cm | Multiple ranges selectable |
| Conductivity Accuracy | ±2% | - |
| Conductivity Resolution | 1 μS/cm | - |
| pH Range | 3 ~ 10 | - |
| pH Accuracy | ±1 | - |
| pH Resolution | 0.01 | - |
| Output Signal | RS485 | Standard Modbus-RTU protocol |
| Default Address | 0x01 | Supports broadcast address 0xFE |
| Supply Voltage | 7 ~ 24 V DC | - |
| Operating Temperature | -30°C ~ 70°C | - |
| Stabilization Time | 3 s | After power-on |
| Response Time | <1 s | - |
Physical Specifications
| Parameter | Specification |
|---|---|
| Probe Material | 316L Stainless Steel |
| Housing Material | ABS Engineering Plastic |
| Sealing Material | Epoxy Resin |
| Protection Rating | IP68 |
| Cable Specification | Standard 2 m (customizable, maximum 1200 m) |
FAQ
Q: What measurement principles does the OHTS1024 use?
A: The sensor employs Frequency Domain Reflectometry (FDR) principle for soil moisture measurement, platinum resistance thermometer (PT1000) technology for temperature detection, stainless steel probe contact measurement for soil electrical conductivity, and glass electrode method for soil pH measurement.
Q: What is the protection rating and installation requirement for this sensor?
A: The sensor has IP68 ingress protection rating with fully sealed structural design using epoxy resin sealing. The epoxy resin sealed portion must be completely buried in the soil to ensure the effectiveness of the IP68 protection rating.
Q: What is the communication protocol and how to connect the sensor?
A: The sensor uses RS485 interface with standard Modbus-RTU protocol at 9600 bps baud rate. Wiring includes Red for VCC 7 ~ 24 V DC, Black for GND, Yellow for RS485 A plus, and White for RS485 B minus.
Q: Can I use the broadcast address if I forget the device address?
A: Yes, if the original address is forgotten, the broadcast address 0xFE can be used for query or modification. However, only one slave device may be connected on the RS485 bus when using the broadcast address.
Q: What are the measurement ranges and accuracy specifications?
A: Temperature range is -30 ~ 70°C with plus minus 0.2°C accuracy. Moisture range is 0 ~ 100 percent with plus minus 2 percent accuracy within 0 ~ 50 percent range. Conductivity has multiple ranges up to 20000 microS per cm with plus minus 2 percent accuracy. pH range is 3 ~ 10 with plus minus 1 accuracy.