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The Computer Controlled Soil Moisture Suction Sand Unit, "PAHSC", has been designed by EDIBON to study and understand the water retentivity principles in terms of soil suction, the relationship between water retentivity and soil and the derivation of soil moisture characteristic curves. The unit is large enough to permit the simultaneous evaluation of several samples and consists of a suction system and a soils container: Soil samples placed on the sand are subjected to suction. This suction is applied by means of the water jet pump and the water pump. In order to maintain the suction, a volume water supply is required. This Computer Controlled Unit is supplied with the EDIBON Computer Control System (SCADA), and includes: The unit itself + a Control Interface Box + a Data Acquisition Board + Computer Control, Data Acquisition and Data Management Software Packages, for controlling the process and all parameters involved in the process.