SM150T Soil Moisture Sensor
Overview
The SM150T’s advanced patented electronics and tough build produce a highly reliable soil moisture sensor with exceptional salinity and temperature stability. The SM150T is engineered to withstand long term burial – the sensor, connectors and cable are all environmentally protected to IP68. It offers moisture accuracy of ± 3% (after soil specific calibration) and the built in temperature sensor achieves ± 0.5°C.
Feature
・Dependable ±0.03m3/m3 (± 3% F.S) soil moisture accuracy
・ADR method that is not affected by temperature and salinity (nutrient) fluctuations
・Applicable to other applications such as manual spot measurement and fixed point measurement with logger
・Suitable for -20 to +60°C environments (for research on irrigation, greening, hydrology, and global warming countermeasures)
・DC input range 5~14VDC for driving sensors. Output range 0~1.0VDC
・All products have been calibrated, so there is no individual difference when purchasing multiple products within the accuracy guarantee.
・Built-in thermistor temperature sensor
SM150 KIT
The SM150 Soil Moisture Kit provides an affordable and easy-to-use tool for obtaining reliable moisture measurements with minimal soil or substrate disturbance.
The kit comprises an SM150T* Soil Moisture Sensor, a dedicated HH150 Moisture Meter and a carry case. The cable and connector are watertight – an essential requirement for potentially wet environments.
The HH150 Meter displays volumetric water content (% volume). Please note that although the SM150T Sensor has a built-in temperature sensor, the HH150 Moisture Meter does not measure or display temperature
| Soil Moisture | Soil moisture＋Temperature | |
| SM150KIT | 〇 | × |
| SM150T + HH2 | 〇 | × |
| WET2 +HH2 | 〇 | 〇 |
| HH150: SM150 KIT 付属品 | Handy Logger HH2 |
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| The HH150 is a display unit for direct reading only and data cannot be saved to a PC, etc. It is easy to operate and can be used by anyone. It is recommended for measurement while carrying. | Some people may find it inconvenient just to display it as a KIT accessory HH150.For those who want to save data while carrying it around, we recommend combining it with the Handy Logger HH2. |
Simultaneous measurement of soil moisture and soil temperature at multiple points
Some customers may want to simultaneously measure soil moisture and soil temperature with the SM150T. For those people, we recommend multi-channel data loggers.
Comparison table
| Data Logger | Soil Moisture＋Soil Temperature | Only Soil Moisture |
| GP1 | Maximum 2 SM150T sensors | Maximum 2 SM150T sensors |
| GP2 | Maximum 6 SM150T sensors | Maximum 12 SM150T sensors |
| MIJ-01 | Maximum 8 SM150T sensors | Maximum 16 SM150T sensors |
| MIJ-12 | Only Soil Moisture | Maximum 1 SM150T sensor |
8 SM150T sensors connected to MIJ-01: The wiring is neatly organized.
Details of data loggers (Click the photo for details of each logger)
GP1
GP2
MIJ-01
MIJ-12
Specification
| Power requirement | DC5~14V(18mA) |
| Output | DC0〜1V（0〜0.6m3/m3）Output 0V in air. Outputs more than 1V in fresh water. *100% fresh water is a different condition than 100% soil VWC. |
| Sensor calibrations | Individual sensors are interchangeable |
| Calibration coefficient |
θ：volumetric water content m3/m3、VWC%=m3/m3×100、V：Volt、√ε：dielectric constant Mineral Soil： Organic Soil： Dielectric constant： |
| Response speed | 0.1sec |
| Temperature Range | Operation temperature range: -20~+60℃ |
| Environmental | IP68 |
| Cable (optional) | 5m cable Extension cable (Maximum extension is 100m) For SM150KIT 90 cm long cable is included |
| Accuracy | ±3%(at0~60％、0〜60℃) |
| Salinity range | ±5％(at0~60％、10〜1000mS/m) |
| Size/ weight |
Overall: 143 x 40 mm diameter Rods: 51 mm x 2.5 mm diameter Weight: 0.1 kg (exc. cable) |
| Connection |
Brown/PWR 0V (GND), |
SM150T Size
Burial possible
How to set SM150T
Related product
・High sensitivity -0.1939℃/mV
・Fast response t63.2=2.6 seconds at Static Water
・Accuracy ±0.05℃ that exceeds Pt100 Class AA standard
・Low power consumption 27.6μW(Overall, Max)