What our DL-SMTP has seen since 2019

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Same tree, same device, same probe in the ground. Everything else changes.

Installed in Guévaux on Lake Murten, Switzerland in July 2019, the DL-SMTP | Soil Moisture and Temperature Profile for LoRaWAN®measures soil moisture and temperature at six levels along its 600 mm profile. Polycarbonate enclosure (IP67), running continuously — no recalibration.

Snow in the winter photo. In the soil data for the same period: none of the six levels ever drops below 0 °C. The moisture follows the same rhythm each year — high in winter, a late-summer drop, recovery in autumn.

The DL-SMTP is built for places where soil water drives decisions: irrigation control, smart agriculture, tree plantations, and parks. Six levels along the same profile show not just whether the surface is dry, but how far down the water has reached — and where it hasn't.

Key facts

  • Sensor: DL-SMTP, soil moisture and temperature at 6 levels along a 600 mm profile

  • Probe: very robust design, 600 mm length, 32 mm shaft diameter

  • Measurement interval: 10 minutes

  • Power: 2× alkaline C batteries

  • Running since: 2019

  • Maintenance: almost none

Full specs, accuracy ranges, payload format and more in the datasheet.
→ Download DL-SMTP datasheet

Explore real-time data from this sensor on our demo site.
→ Visit DL-SMTP real-time demo