Ecomatik - SMT100 - Soil Moisture and Soil Temperature Sensor
The SMT100 soil sensor allows for easy, inexpensive soil moisture and temperature measurements. This device enables both the precise analysis of the soil water balance and the determination of plant soil water availability. The SMT100’s integrated temperature sensor additionally provides important data on ground temperature. The device’s numerous applications range from data collection for scientific purposes to irrigation control in commercial agriculture and horticulture.
Through its special design and optimized measuring principle, the SMT100 combines the advantages of low-cost FDR sensors with the accuracy of TDR measurements. Where other soil moisture sensors reach their limits, the high operation frequency (> 100 MHz) as used in SMT 100 measurements allows allow this sensor to take reliable measurements even in dense clay soils. Further advantages include the short measuring time, a low sensitivity to salinity, and a large measuring range. Sensor and cable are maintenance-free, waterproof and frost-resistant. The SMT100 is therefore ideal for continuous operation.
The compact, functional and robust design of the glass-fiber reinforced, blade-shaped sensors enable simple installation for permanent measurements or easy insertion into the soil for manual point measurements with handset. Variants with different communication protocols (RS-485, SDI-12) as well as a version with analogue output are also available.
- Accurate determination of soil water content
- Integrated temperature measurement
- Suitable for every soil type
- Easy installation (ongoing measurement) and insertion (manual measurement with handset) into soil
- Cost-effective
- Compatible with almost every logger system (interface options: Analogue Volt Signal, RS-485, SDI-12)
Our open and modular system is highly flexible and easy to expand in stages. In this case, virtually all sensors or other peripheral devices (such as a webcam) can be integrated.
Ecomatik sensors include:
- Dendrometers
- Sap flow sensors
- Temperature sensors
- Leaf sensors
- Humidity and air temperature sensor
- Soil moisture sensors
- And many more…
Sensor model name | Soil moisture and soil temperature sensor Type SMT100 |
Scope of application | For continuous (permanent installation) or manual (insertion with handset) measurements of the volumetric water content of soil (SWC). |
Suitable for | All soil types |
Special features/limitations | Special feature: read out of additional information possible: »Raw data, dielectric permittivity Limitation: Use for manual point measurements in highly abrasive technosols is not recommended |
Measurement range | SWC: 0 to 60% volumetric water content (up to 100% volumetric water content with restricted accuracy) Temperature: Temperature: -40 to + 80 ° C (analogue version -40 to + 60 ° C) |
Resolution | 0.1% SWC 0.01 ° C (analogue version 0.2 ° C) |
Accuracy | Volumetric water content (SWC)
Temperature
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Logger requirements and sensor output signal | All data loggers with suitable power supply and RS485 Interface (TBus, Modbus, ASCII), SDI-12 or Analogue input 0 – 10 V (other voltage ranges on request) |
Power supply | 4 – 24 V DC, up to 40 mA peak during measurement (Analogue version 12 – 24 V DC for 0 – 10 V output signal) Measuring time digital versions: less than 50 ms Measuring time analogue versions: less than 500 ms |
Operational conditions | Air temperature: -25 to 70 ° C, rel. air humidity: 0 to 100% |
Size & Weight (sensor without cable) | 18.2 cm x 3 cm x 1.2 cm; about 80 g without cable |
Sensor cable length | 10 m, can be extended on request |