Professional soil moisture and temperature sensor using TDR (Time Domain Reflectometry) technology for precise volumetric water content measurement. Suitable for mineral soils and porous materials, with high accuracy even in wet conditions.
The DQA340 soil moisture and temperature sensor is designed for accurate measurement of volumetric water content and soil temperature in mineral soils and other porous materials. Based on advanced TDR (Time Domain Reflectometry) technology, it ensures precise readings even in very wet conditions without the need for special calibration for mineral soils.
Applications
Ideal for agriculture, environmental monitoring, and scientific research, the DQA340 helps optimize irrigation management, monitor soil health, and support crop productivity. It can be used both in field and greenhouse environments.
Design and Installation
Equipped with durable electrodes, the sensor can be inserted 11 cm into the soil or fully buried. Its waterproof sealed PVC housing ensures long-term performance in challenging outdoor conditions. The included 5 m cable allows flexible placement and integration with compatible data loggers.
Main Advantages
- TDR technology for high accuracy and stability in various moisture levels
- Accuracy on water content better than ±2% (0–40% range)
- Usable at any depth in soil or other porous media
- Waterproof and robust PVC housing for outdoor applications
Usage Guidelines
- Insert electrodes 11 cm into the soil or bury fully for continuous monitoring
- Connect to SDI-12 compatible data loggers such as E-Log or Alpha-Log (with ALIEM module)
- Operate within the specified temperature and voltage ranges for reliable performance
- For mineral soils, no special calibration is required
Technical Specifications
| Parameter | Specification |
|---|---|
| Measurement Principle | TDR (Time Domain Reflectometry) |
| Volumetric Water Content Range | 0…100% VWC |
| Accuracy | 0–40%: ±2%; 40–70%: ±3% |
| Repeatability | ±0.3% |
| Salinity Error | <3% for 0–40% |
| Sampled Volume | 0.25 L ± 110x50 mm diameter |
| Temperature Range | -40…70 °C |
| Temperature Accuracy | ±0.5 °C relative |
| Power Supply | 7…24 V DC |
| Power Consumption | Sleep: 5 mA; Measuring: 175 mA @ 7 V DC |
| Power-up Time | 3 s |
| Operating Temperature | -15…50 °C |
| IP Protection | Waterproof sealed PVC |
| Cable Length | 5 m |
| Dimensions | Body: 155 x Ø32 mm; Rods: length 110 mm |
| Output | 2x 0…1 V, SDI-12 |
| Measured Quantities | Temperature (°C), Water Content (%) |
| Data Logger Compatibility | E-Log; Alpha-Log (with ALIEM module) |
| Brand | LSI-Lastem |
