Probe for Soil Volumetric Water Content Measurement
The probes HD3910.1 (two electrodes) and HD3910.2 (three electrodes) measure the soil volumetric water content (VWC) by using a capacitive measurement principle which allows fast measurements in the eld and with minimal invasiveness.
The three-electrode probe HD3910.2 is particularly suitable for the measurement in small volumes, for example for cultivations in pots.
The probes are factory-calibrated and do not require any further calibration by the end user.
The circuit board is protected inside a housing made of plastic material and sealed with epoxy resin which allows achieving reliable measurements even in harsh envi- ronmental conditions.
The RS485 digital output with MODBUS RTU protocol allows the use of even very long connection cables. It can be connected to the data loggers HD32MT.1 and HD32MT.3 or to any other data logger with RS485 MODBUS RTU input.
The probes are equipped with a xed cable, 5 or 10m standard length, with open wires at the end.
The temperature probe TP32MTT.03 is equipped with seven Pt100 1/3 DIN sensors for the measurement of temperature at depth: +5 cm, 0, ‐5 cm, ‐10 cm, ‐20 cm, ‐50 cm, ‐1 m with respect to the soil level, according to the indications of the World Meteoro‐ logical Organization (WMO). The probe TP32MTT.03.1 is equipped with six Pt100 1/3 DIN sensors for the measure‐ ment of temperature at depth: +5 cm, 0, ‐5 cm, ‐10 cm, ‐20 cm, ‐50 cm with respect to the soil level.
The HDWME microphone unit is suitable for long term outdoor monitoring, even in a fixed unattended location. The unit is adequately protected from rain and wind and the heated preamplifier provides stability of acoustic parameters over time and allows to make measurements over a wide range of environmental conditions.
HD 9408T BARO, HD 9408TR BARO and HD 9908T BARO are analog output electronic barometers. They use a piezoresistive sensor element which gives extremely accurate and stable measurement of the atmospheric pressure and assures excellent repeatability, low hysteresis and very good temperature stability.