Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Updated:2025-03-13
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User's Manual
5TM is designed to measure the volumetric water content and temperature of soil or cultivated substrate. 5TM uses an oscillator operating at 70 MHz to determine the volumetric water content of the soil by measuring its dielectric constant. Sensor A thermistor on a fork probe determines soil temperature.
5TM determines volumetric water content (VWC) by measuring the permittivity of soil (or other media) using capacitance/frequency domain techniques. Signal filtering minimizes salinity and texture effects, making 5TM more accurate in most soil and soilless media. Factory calibration includes mineral soil, potting soil, rockwool and perlite.
In 2006, Decagon upgraded its EC-5 volumetric water content sensor to an EC-TM sensor that measures both volumetric water content and temperature. Although the 5TM and EC-TM sensors use the same measurement principle, they use an improved calibration procedure and have an SDI-12 output. The 5TM uses a 5-point calibration procedure to determine the dielectric constant, which is more accurate than the previous EC-TM.
| Technique Data | Apparent permittivity (ε 1) : ±1ε a from 1-40 (soil range); ± 15% from 40-80 |
| Measurement Range |
Soil volumetric Water Content (VWC) : using the Topp equation: solution conductivity < Typical ±0.03 m/m 3 (± 3% VWC) in 10 dS/m mineral soils using medium specific calibration, ±0.02m/m 3 (± 2% VWC) in any porous medium Temperature: ±1°C |
| Measuring precision |
VWC：0.0008m3 / m3 （0.08％VWC），0 to 50％VWC Temperature: 0.1°C εa: 1 (air) to 80 (water) |
| Working Temperature |
Temperature: -40-60°C * Under certain conditions, the sensor can be used at higher temperatures. Contact us for more details. |
| Size | 10cm×3.2cm×0.7cm |
| Output | RS232（TTL），SDI-12 ，RS485 |
| Cable Length | The sensor comes standard with 5 meters of cable. Custom cable lengths are available. The maximum cable length is 75 m. If you need longer cable lengths, please contact us. |
| Measured Time | 150 ms |
| Power | 3.6-15VDC, 0.3 mA static, 10 mA during 150 ms measurement |
| Output | RS232 or SDI-12 |
| Connector type | 3.5mm "stereo" plug, or strip tinned wire (3) |
| Data Logger | Em50，ProCheck，Campbell Scientific，SDI-12 Converter |
Note: This product can be customized according to customer requirements interface (RS232/RS485), communication protocol (MODBUS), etc. In addition, the company has RS232/RS485 to SDI-12 module, which is convenient for customers to secondary development and debugging. Please click if necessarySDI-12 vRS232 RS485
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