The 5TM determines volumetric water content (VWC) by measuring the dielectric constant of the soil (or other media) using capacitance/frequency domain technology. Signal filtering minimizes salinity and textural effects, making the 5TM accurate in most soils and soilless media. Factory calibrations are included for mineral soils, potting soils, rockwool, and perlite. The 5TM's small size makes it easy to install in the field and the greenhouse. This robust sensor can be pushed directly into undisturbed soil to ensure good accuracy. Get straight to the data with an Em50-series data logger. Just install the 5TM, plug it into the Em50, set the clock and measurement intervals, and start logging data. No programming required. The 5TM comes standard with both serial and SDI-12 communication options, meaning easy integration with systems manufactured by other companies.
| Specifications | |
|---|---|
| Accuracy | Apparent dielectric permittivity (E a): ± E a (unitless) from 1-40 (soil range), ±15% from 40-80 VWC: Using Topp equation: ±0.03m3/m3 (±3% VWC) typical in mineral soils that have solution electrical conductivity <10dS/m Using medium specific calibration, ±0.01 - 0.02m3/m3 (±1-2% VWC) in any porous medium Temperature: ±1°C |
| Resolution | Ea: 0.1Ea (unitless) from 1-20, <0.75Ea (unitless) from 20-80 VWC: 0.0008m3/m3 (0.08% VWC) from 0to 50% VWC 0.25% VWC (rockwool) Temprature: 0.1°C |
| Range | Ea: 1 (air) to 80 (water) EC: 0-23 dS/m (bulk) Temperature: -40-50°C |
| Dimensions | 10 x 3.2 x 0.7cm |
| Cable Length | 5m, custom cable lengths available upon request |
| Measurement Time | 150 ms |
| Power | 3.6-15 VDC, 0.3mA quiescent, 10mA during 150ms measurement |
| Output | RS232 or SDI-12 |
| Connector Types | 3.5mm stereo jack plug or stripped and tinned lead wires (3) |
| Data Logger Compatibility | Decagon: Em50, Em50G, ProCheck Campbell Scientific: CR200X - series, CR800/CR850, CR1000, CR3000, CR9000X Other: Any data acquisition system capable of 3.6-15V excitation and serial or SDI-12 communication |
| Warranty | One year, parts and labour |
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