| 摘要 |
The invention relates to a photometric system meant to determine the concentration of several chemical species in a solution and also to concomitantly determine the electrical conductivity of the solution. According to the invention, the photometric system comprises an optoelectronic structure having as a main element some tongs with resilient clamping consisting of two pressing arms (1 and 2), two dies (3 and 4) of plastic material provided with some cylindrical holes, wherein on one of the dies, there are mounted five light-emitting diodes (L...L) emitting a monochromatic radiation, each on different wavelength, and, on the other die, there are mounted five receiving photodiodes (F...F) radially distributed around a glass tube (5) wherein there is in stationary condition or through which there flows a solution (s) to be analyzed; in order to measure the conductivity of the solution (s), on each die ( 3 and 4) there is mounted a curved electrode ( 6 and 7) made of stainless steel sheet, each of the two electrodes (6 and 7) exhibiting some circular orifices in front of the light-emitting diodes (L...L) and photodiodes (F...F), respectively, an electronic unit (13) being connected to thus formed structure, said electronic unit comprising, in its turn, a high frequency oscillating circuit, a system of multiplexed reading the photometric values and a data acquisition, processing and display system. |
