Profiling Soil Moisture Probes with LoRaWAN Communications



View Otto-Lo Brochure




What it is


The Otto-Lo is a profiling soil moisture probe with integrated LoRaWAN communications modue. The probe is available in a variety of lengths and with varying sensor counts. Should you wish to add LoRaWAN compatibility to the sub surface Otto probes, we can supply the TBS12E, a battery powered LoRaWAN to SDI-12 converter.


Flexible Configuration


The probes may be built in lengths of 30cm to 200cm and can be fitted with from 2 to 15 sensors. The sensor elements can be installed at 10cm increments along the probe body and, to save cost, depths can be skipped by inserting spacer boards of 10, 20 or 30cm length.


Form Factor


Rather than the 50mm format of the original capacitance  sensors, the Otto probes are built on a 32mm slimline design. This means a faster installation process (and easy removal).


Data Logging


The Otto’s SDI-12 interface allows the probes to be connected to any SDI-12 compatible logging device. Each sensor element returns Soil Moisture (%) and soil temperature (degrees C).




The Otto  sensors come with a default air-water calibration and users can select  generic soil calibrations for sand, potting mix and clay. Users can perform their own soil specific calibration and save the obtained calibration coefficients on to  the probe. The Otto probes are the first capacitance probe to include soil temperature compensation: allowing users to remove the changes in indicated moisture caused by variations in the dielectric properties of the soil with temperature.


Re-Enterable Above Ground


The above ground version of the Otto probes are completely user configurable - users can add or remove sensors at any time. This gives installers the flexibility to shorten a probe if they hit a rock layer or to adjust sensor positions to match the soil profile. Being re-enterable the sensors can be serviced and any faulty components replaced.


More Details