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 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.
The SM150T is a dual-purpose soil moisture sensor – it can be used portably for instant moisture readings or left installed in the soil connected to a data logger, to provide long-term moisture and temperature data.
The SM150T can be logged by any Delta-T Devices data logger and by many loggers from other manufacturers (simple 0-1 V output for moisture, 10K thermistor for temperature). To record temperature the sensor must be fully buried and connected to a data logger..
The SM150T is available as part of the convenient SM150 Kit, complete with a carry case and HH150 readout meter. Find out more about the SM150 Kit.
Please note that the HH150 Meter supplied with the SM150 Kit is a readout-only device. If PC connectivity for data storage and download is a requirement, the SM150T should be used with the HH2 Moisture Meter instead.
NB: When used in portable mode the SM150T Sensor does not provide temperature indication.
| Measurement | Volumetric water content and soil temperature |
|---|---|
| Accuracy | ± 0.03 m3.m-3 (3%) - With soil-specific calibration ± 0.5°C (0 to 40°C for temp sensor) ± 0.75°C (-20 to +60°C for temp sensor) |
| Soil moisture measurement range | Full accuracy over: 0 to 0.7 m3.m-3 Full range : 0 to 1.0 m3.m-3 |
| Salinity range | 50 to 500 mS.m-1 Salinity errors < 0.035 m3.m-3 from 0.05 to 0.4 m3.m-3. Can be calibrated up to 2000 mS.m-1 |
| Temperature range | Full accuracy over: 0 to 40°C |
| Output | 0 to 1.0 V differential - Corresponding to 0 to ~0.6 m3.m-3 Resistance 5.8Ω to 28Ω for temp sensor |
| Power requirement | 5-14 V, ~18 mA for 1s Minimum 5 V with 100 m cable |
| Environmental | IP68 (-40 to +70°C) |
| Sample volume | ~55 x 70 mm diameter Sample volume is weighted towards soil immediately surrounding the rods |
| Dimensions and weight | Overall: 143 x 40 mm diameter Rods: 51 mm x 2.5 mm diameter Weight: 0.1 kg (exc. cable) |
| Sensor calibrations | Individual sensors are interchangeable Recalibration advised every 3 years (depending on use) |
| Soil calibrations | Generalised Mineral and Organic soil calibrations are supplied |
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