Flow Control Module

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Linearization and Calibration

Abstract

Experiments run in fall 2007 have indicated that the float valve can hold back head of at least 8m with less than 0.5cm of change occurring in the flow controller water level in the first 2m of pressure. In field tests in Honduras the flow controllers have not been dosing as expected, which current lab work is aiming to correct. Data gathered in the laboratory on outflow rate has followed a linear model in the laminar flow range, but attempts to model the turbulent transition range have produced varying results. It is considered a high priority to develop a reliable model for dosing at higher flow rates, which will be used in the near future at the larger plant in Marcala, currently under construction.

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