Product Overview
The OHTS1020 is an integrated multi-parameter isolated soil sensor capable of simultaneously monitoring soil temperature, volumetric water content, electrical conductivity, salinity, nitrogen, phosphorus, potassium, and pH value. The temperature measurement unit utilizes an NTC precision thermistor with signal conditioning circuitry, integrating zero-drift compensation and temperature compensation algorithms. Moisture measurement is based on the Frequency Domain Reflectometry principle, obtaining volumetric water content through high-frequency detection of soil dielectric permittivity.
Electrical conductivity and salinity measurements employ 316L stainless steel probes, supporting temperature compensation to standard conditions at 25 degrees Celsius. Nitrogen, phosphorus, and potassium detection is achieved through an Ion Selective Electrode array, while pH measurement utilizes a glass electrode or corresponding sensing element. The sensor integrates an electrical isolation module with an isolation voltage of 1500V, making it suitable for precision agriculture monitoring in complex electromagnetic environments.
Features
- Eight-Parameter Integrated Measurement: Simultaneously acquires soil temperature, moisture, electrical conductivity, salinity, pH, and NPK nutrient data
- High-Precision FDR Moisture Detection: Based on dielectric permittivity measurement, directly reflecting true soil volumetric water content
- Electrical Isolation Design: Port isolation voltage 1500V, RS485 isolation withstand voltage 5000VRMS, CMTI up to plus or minus 150kV per microsecond
- Industrial-Grade Protection: 316L stainless steel probes, ABS engineering plastic and epoxy resin sealing, IP68 protection rating
- Wide Temperature Operation: Adapts to ambient temperatures from minus 30 degrees Celsius to 70 degrees Celsius
- Fast Response: Response time less than 1 second, power-on stabilization time 3 seconds
- Standard Communication Protocol: RS485 interface, Modbus-RTU protocol, supporting address configuration and broadcast queries
Applications
- Water-saving agricultural irrigation systems
- Meteorological and environmental monitoring stations
- Greenhouse environmental control systems
- Flower and vegetable cultivation management
- Grassland and pasture soil monitoring
- Rapid soil testing and surveys
- Scientific research on plant cultivation
- Precision agriculture trials and demonstrations
Technical Specifications
| Parameter Category | Specification | Unit/Remarks |
|---|---|---|
| Measured Parameters | Soil Temperature, Soil Volumetric Water Content, Soil Electrical Conductivity, Soil Salinity, Soil N/P/K, Soil pH | - |
| Temperature Range | -30 ~ 70 | °C |
| Temperature Accuracy | ±0.2 | °C |
| Temperature Resolution | 0.1 | °C |
| Moisture Range | 0 ~ 100 | % (m³/m³) |
| Moisture Accuracy | ±2 (within 0 ~ 50% range) | % (m³/m³) |
| Moisture Resolution | 0.1 | % |
| EC/Salinity Range | 0 ~ 2000 / 0 ~ 10000 / 0 ~ 20000 | μS/cm |
| EC/Salinity Accuracy | ±2 / ±2 | % |
| EC/Salinity Resolution | 1 | μS/cm |
| pH Range | 3 ~ 10 | - |
| pH Accuracy | ±1 | - |
| pH Resolution | 0.01 | - |
| N/P/K Range | 0 ~ 1999 | mg/kg (mg/L) |
| N/P/K Accuracy | ±3 | % (mg/kg) |
| N/P/K Resolution | 1 | mg/kg (mg/L) |
| Output Signal | RS485 (Modbus-RTU) | Default Address: 0x01 |
| Supply Voltage | 7 ~ 24 | V DC |
| Power Consumption | ≤0.3 | W |
| Operating Temperature | -30 ~ 70 | °C |
| Stabilization Time | 3 | s (after power-on) |
| Response Time | <1 | s |
| Electrical Isolation | 1500 | V (isolation voltage) |
| RS485 Isolation Withstand Voltage | 5000 | VRMS (60s) |
| CMTI | ±150 | kV/μs |
Physical Specifications
| Parameter Category | Specification |
|---|---|
| Probe Length | 55 mm |
| Probe Diameter | φ3 mm |
| Probe Material | 316L Stainless Steel |
| Housing Material | ABS Engineering Plastic |
| Sealing Material | Epoxy Resin |
| Protection Rating | IP68 |
| Cable Length | Standard 2 m (Customizable, max 1200 m) |
FAQ
Q: What parameters can the OHTS1020 measure simultaneously?
A: The OHTS1020 can simultaneously monitor soil temperature, volumetric water content, electrical conductivity, salinity, nitrogen, phosphorus, potassium, and pH value.
Q: What is the isolation voltage rating of this sensor?
A: The sensor integrates an electrical isolation module with an isolation voltage of 1500V. The RS485 interface features 5000VRMS withstand voltage for 60 seconds and plus or minus 150kV per microsecond Common-Mode Transient Immunity.
Q: What is the protection rating of the OHTS1020?
A: The sensor has IP68 protection rating with 316L stainless steel probes and epoxy resin sealing, making it suitable for long-term soil burial.
Q: What precautions should be taken during installation?
A: Avoid forceful hammering or insertion into hard soil clumps to prevent probe bending or damage. Ensure the full 55mm probe length enters the soil and provide strain relief for the cable exit portion. Do not pull directly on the cable when removing the sensor.
Q: What is the recommended power supply voltage range?
A: The supply voltage range is 7 to 24 V DC. Input supply voltage must not exceed 24V DC as overvoltage will cause permanent hardware damage.