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ST01 soil temperature sensor

Soil temperature sensor

ST01 is a high quality temperature sensor that is specifically designed for soil temperature measurement in extreme environments. Using top quality materials it is suitable for hostile conditions as encountered in outdoor installation (temperature, radiation, chemicals). It is designed to have a record-breaking lifetime with optimal stability. Employing a platinum sensor, at extreme temperatures a higher accuracy can be attained than with commonly used thermistors.

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An ultra-stable sensor that can withstand extreme conditions

The measurement of soil temperature is recommended by the World Meteorological Organisation at depths of 5, 10, 20, 50 and 100 cm. Proper installation of soil temperature sensors requires a lot of effort. Once installed, sensors are usually left alone without calibration for a long time. This means that the sensor and cabling should be very reliable and stable over time. ST01 is designed to be an ultra-stable sensor that can withstand the extreme conditions met in meteorological use; partially sub-soil, partially above-soil installation.


Measurand temperature
Measurement range -60 to +150 °C, cable remaining flexible
Standard sensor Pt100, IEC 751:1983 class A
Alternative sensors Pt500, Pt1000
Attainable accuracy +/- 0.25 °C  +/- 0.15 °C with individual calibration (both across -50 to +50 °C)
Moisture protection needle and cable until wiring exit IP 68
Pressure resistance 6 bar
UV resistance no UV degradation
Standard cable length 3 m
Expected lifetime >10 yrs (normal field conditions)
Cable material extruded PTFE
  • can be ordered with extended cable


Suggested use

  • extreme environments: arctic & desert regions, polluted soil
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