Decagon 5TM Sensor
– soil moisture & temperature sensor
The 5TM delivers temperature, measured by an onboard thermistor, along with accurate volumetric water content.
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.
plug and read
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.
advantages of the 5TM
- Measures VWC and temperature
- SDI-12 compatible
- 715 mL volume of influence
- Soil moisture sensors, probes and meters
- Soil water potential sensors
- Pore water samplers
- Soil CO2 concentration
- Soil nutrient analyzer
- Soil pH meter
- Soil EC meter
- Sap flow sensors
- Weather stations
|Soil Moisture||Apparent Dielectric Permittivity (εa): ± 1 εa from 1 - 40 (soil range); ± 15% from 40 - 80 Soil Volumetric Water Content (VWC): Using Topp equation: ± 0.03 m3/m3 (± 3% VWC) typical in mineral soils that have solution electircal conductivity < 10 dS/m; using medium specific calibration, ± 0.02 m3/m3 (± 2% VWC) in any porous medium|
|Temperature||Temperature: ± 1°C Note: Temperature measurement may not be accurate if sensor is not fully immersed in the medium of interest, due to excessively long equilibration time.|
|Soil Moisture||εa: 0.1 εa from 1-20, < 0.75 εa from 20-80 VWC: 0.0008 m3/m3 (0.08% VWC) from 0 to 50% VWC|
|Soil Moisture||εa: 1 (air) to 80 (water) VWC: 0% to saturation|
|Temperature||-40 to 60°C|
|Soil Moisture||Frequency domain / capacitance|
|Measurement Speed||150 ms (milliseconds)|
|Operating Environment||-40°C to 60°C|
|Power Requirements||3.6 - 15 VDC, 0.3 mA quiescent, 10 mA during 150 ms measurement|
|Cable Length||Sensors come standard with 5 m cable. Custom cable lengths available. Maximum cable length of 75 m.|
|Cable Connectors||3.5 mm "stereo" plug, or stripped and tinned lead wires (3)|
|Sensor Size||10 cm x 3.2 cm x 0.7cm|
|Data Logger Compatibility||Decagon Em50 Series, ProCheck, SDI-12 data loggers|
|Warranty||One year, parts and labor|
- How to calibrate soil moisture sensors
- What is a capacitance sensor?
- 5 common mistakes when measuring soil moisture
- The Soil Water Compendium