Abstract
New Technologies applied to the manufacture of sensors permit us to obtain more sensitive devices of high linearity that, with suitable conditioner circuits, can be incorporated into digital control systems by means of a control and acquisition data board. In this paper a method is described based on pressure sensors which can measure small flows (in the range 0 - 10 ) such as those generated in transportation through membranes. This problem was treated previously by means of an automated flowmeter, using a programmable logic controller (Forte J et al 1990 Rev. Sci. Instrum. 61 1123 - 6). The main problem that we attempt to solve is that of on-line flow measurement, to know the flow at each moment and to take corresponding action in the experimental system. Another method was used before (Molina C et al 1995 Rev. Sci. Instrum. 65 2726 - 30) but, if we wanted to make measurements at different temperatures, we had to obtain another calibration curve.
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