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 HD3901 leaf wetness sensor detects the presence of condensation on its sensitive surface and has been designed to reproduce in an extremely accurate way the thermodynamic behaviour of a leaf. The leaf wetness degree is a basic information in the agricultural and floriculture fields to determine the most appropriate phytosanitary treatment to prevent mould and fungal infections in general that can affect the plants and crops in the presence
of condensation on the leaves.
2 axes ultrasonic Anemometers series HD 52.3D…. The instruments of the series HD52.3D… are 2 axes ultrasonic static anemometers for measuring:
– Wind speed and direction, U-V Cartesian components of wind speed
– Relative Humidity and Temperature (optional, code ‘17’)
– Diffuse Solar Radiation (optional, code ‘P’)
– Barometric pressure (optional, code ‘4’)
The Sunshine Duration sensor LP SD18 measures sunshine status and duration. The WMO (World Meteorological Organization) defines the sunshine duration as the time during which the direct solar radiation exceeds the level of 120 W/m2.