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SM1 Soil Moisture Sensor

Soil moisture and temperature

The SM1 soil moisture probe is an extremely flexible system, offering capacitance based measurement of soil moisture plus temperature monitoring.


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Available in a variety of lengths, starting with 30cm and ending at
150cm, the SM1 features one soil moisture sensor every 10cm. As
installation method both access tube and slurry installation are supported.
The sphere of influence of the sensor rings is approx. 10cm in radius around
the access tube.

Depending on the length of the sensor up to 5 temperature sensors are available. The 30, 60, 90, 120 and 150cm
probes have their first temperature sensor located at 15cm and every additional sensor with a spacing of 30cm, thus at
45, 75, 105 and 135cm respectively.

All signals are delivered through the SDI-12 protocol. To connect a standard 2, 4 or 8m cable the Probe features a 7-pin
Binder jack with IP67 rating.

  • Irrigation
  • Landfills
  • Geological observations
Leaflet - SM1 Soil Moisture Sensor
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Measuring range soil moisture 0 ... 100% Vol
Measuring range temperature -55°C ... +70°C
Method HF Capacitance
Accuracy +/- 2% (with site specific calibration +/-1%)
Interface SDI-12
Lengths 30, 60, 90, 120, 150cm
Number of soil moisture sensors One every 10cm on all versions
Number of temperature sensors 30cm sensor: 1 at 15cm
60cm sensor: 2 at 15 and 45cm
90cm sensor: 3 at 15, 45 and 75cm
120cm sensor: 4 at 15, 45, 75 and 105cm
150cm sensor: 5 at 15, 45, 75, 105 and 135
Power supply 5.5 ...12VDC
Connector 7-pin male Binder connector M9
Tube diameter 32mm (1.25")
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