Geoves

Description

MEASURING PRINCIPLE (Volumetric Water Content)

The two-electrode RHTT probes measure the volumetric water content of the soil (VWC - Volumetric Water Content) using a capacitive measurement principle that allows for rapid field detection with minimal invasiveness. The probes are pre-calibrated and do not require further user calibration. The electronic board is protected inside a watertight plastic container and sealed with epoxy resin which allows reliable measurements to be made even in harsh environmental conditions. The probe has two analogue outputs 0 ... 5Vdc compatible with dataloggers and PLCs with live inputs: one for the volumetric water content and one for the soil temperature. The probes are equipped with a fixed cable, standard 5m long (or 10m on request), terminated with free wires.

The wet soil is made by a solid part (minerals), a liquid part (generally water) and a gaseous part (air, water vapor). The volumetric water content (VWC) is defined as the ratio between the volume occupied by water (Vw) in a specific portion of the soil and the total volume of the on-site soil portion (V):

VWC = Vw / V

The VWC can be expressed as percentage (% VWC) of water volume of a total volume. The volumetric water content is a  parameter used in hydrology for the study of soil hydraulic features and in agriculture to determine the crops irrigation need.

ADVANTAGES

• Integrated temperature measure 
• Easy to install
• Suitable for all main applications
• No required maintenance and long lifetime