A virtual device for assessing the presence of heavy metals in vegetables is developed within the LabVIEW systems engineering software. The quality of vegetable juice with heavy metals contamination is studied in the immitance-measuring way. Device consists of the capacitive transducer (a conductivity cell filled with investigated fluid – vegetable juice with various additives), USB-6009 unit, connected to a computer with the full-speed USB interface. This stand-alone unit equipped with analog inputs and outputs generates the alternating voltage and collects the measured data and measures and computes then integrated voltages as well as immitance. To generate the input signal, the program uses the separate elements of the Data Acquisition section and the Stop Button loop.
The studies of active and reactive components of electrical conductivity of carrot juice samples with different content of copper ions are conducted. The obtained results coincide with the measurement results carried out with help of RLS-meter. Altering the program code of the created virtual device, we get an opportunity with the high exactness, easiness in implementation and operation to diversify easily the series of immitance measurements for the other vegetable juices.
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