Soil moisture sensor SMT50 Truebner

The SMT50 is a reliable and cost-effective soil moisture sensor from Truebner that is particularly suitable for intelligent garden irrigation and simple agricultural applications. With its analog 0-3V output, it is easy to connect and compatible with the OpenSprinkler Analog Sensor Board. Operation with OpenSprinkler The SMT50 has an analog 0-3V output and is powered via the Analog sensor board (€59) connected to OpenSprinkler. Up to 8 sensors can be operated on one board. Technical data Characteristic Value Measuring principle FDR Accuracy soil moisture typically ±3% VW (0–50% VW) Accuracy temperature typically ±0.8°C Soil moisture resolution 0.2% VW (8-bit) Resolution temperature 0.1°C (10mV/°C) Soil moisture measuring range 0-50% VW Measuring range temperature -20 to 85°C Interfaces Analogue 0–3V (soil moisture temperature) Startup time 300 ms Output resistance 10 kΩ Power supply 3.3–30 V DC, 2.7 mA Cable length 10 m Dimensions approx. 13.5 cm × 2.15 cm Documents & Downloads �� Data sheet SMT50 �� Manual SMT50 Sensor comparison: SMT50 vs. SMT100 vs. AquaFlex Characteristic SMT50 SMT100 AquaFlex Measuring principle FDR FDR/TDR hybrid FDR (Area sensor) Measuring volume Point measurement Point measurement 3 m area measurement Accuracy soil moisture ±3% ±3% / ±1%* ±3% / ±2%* Accuracy temperature ±0.8°C ±0.2°C ±0.4°C Interfaces Analogue 0-3V RS-485, SDI-12, Analog, UART RS-485, Analog For OpenSprinklers Analog sensor board RS485 adapter or Analog boardrequires OpenSprinklerShop firmware RS485 adapter or Analog boardrequires OpenSprinklerShop firmware Ideal for Garden, home users Science, precision agriculture Lawn, sports fields, golf * Soil specific calibration Do you need higher accuracy? Switch to SMT100 (€149) or for AquaFlex (€219) for lawns.