Operating Principles of the TEROS 11 Advanced Soil Temperature and Moisture Probe
The TEROS 11 Soil Temperature and Moisture Probe is the advanced soil moisture and temperature sensor. a robust and reliable version.
The 70 MHz working frequency minimizes the effects of salinity and soil texture, improving precision in different types of soil and substrates.
Consisting of a body made of ultra-resistant epoxy resin, the TEROS 11 humidity and temperature probe is designed to withstand the harshest field conditions and water intrusion.
It is ideal for establishing large sensor networks, and is sensitive to small changes in volumetric water content (VWC) across the range of soil and substrate water content.
The new design of the TEROS 11 humidity and temperature probe makes it easy to install in any condition, from dry desert soils to very wet peat.
Influence volume of the TEROS 11 soil humidity and temperature probe
The TEROS 11 soil moisture and temperature probe offers a large volume of influence.
With 9.4 cm stainless steel tines, it offers an influence volume of 1010 mL.
| Technical Specifications of the TEROS 11 Soil Humidity and Temperature Probe |
| Volumetric Water Content (VWC) |
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| Mineral soil calibration: |
0.00 – 0.70 m3/meter3 |
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| Apparent dielectric permittivity (εa): |
>1 (air) to 80 (water) |
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| Resolution: |
0.0010 meters3/meter3 |
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| Accuracy: |
Generic calibration: |
±0.03 m³/m³ (±3.00% VWC) typical in mineral soils having solution EC <8000 μS/cm |
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Media Specific Calibration: |
±0.01–0.02 m³/m³ in any porous media |
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Apparent dielectric permittivity (εa): |
1-40 (ground range), ±1 εa (unitless) 40-80, 15% of measurement |
| Dielectric measurement frequency: |
70MHz |
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| Temperature: |
Operating range: -40 to 60°C |
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| Exit: |
1,000 to 2,500 mV |
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DDI series or SDI-12 communication protocol |
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| Dimensions: |
Length: 5.1cm |
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Width: 2.4cm |
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Height: 7.5cm |
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| Datalogger Compatibility: |
ZL6, EM50/60 series, Em5b or data acquisition systems capable of 3 VDC to 15 VDC power pulse and voltage measurement at a resolution greater than or equal to 12 bits. |
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| Cable length: |
5m (standard) 3.5mm stereo plug or stripped and tinned cables |
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| Supply voltage (VCC) to GND: |
Minimum: 3.0 VDC |
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Maximum: 15.0 VDC |
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Learn best practices for a borehole soil moisture sensor installation using the TEROS Borehole Installation Tool and TEROS Soil Moisture Sensors.
Video: TEROS Soil moisture sensor installation best practice video - METER Group
