Ethanol sensors commercial

Abstract Makrolon , a commercially available polycarbonate with a glassy ultramicroporous structure (mean pore-volume 0.1 nm3), was often employed as sensitive layer for optical sensors in recent years. Due to the definite pore volume-distribution, it can be used as a size-selective sensitive layer. The interaction behaviour of Makrolon of different layer-thicknesses under the influence of methanol, ethanol and 1-propanol is characterized by Spectral El-lipsometry (SE), Surface Plasmon Resonance Spectroscopy (SPR)... 

Commercial instruments for both contacting and noncontacting electrode types come in the form of meters, probes, sensors and flow-through cells. Top-of-the-line instruments will have temperature compensation (a thermistor) built in. It is a simple instrument with the following components a conductivity cell, electrodes and a voltage supply. The conductivity cell consists of two platinum plates with an AC voltage applied between them. The eluent flows through the cell and the current, which depends on the concentration and type of ions, is measured. A conductivity detector responds to all ions but not to molecular compounds like ethanol and water. 

Figure 8.4 shows drift compensation of a commercial tin oxide sensor (TGS2620, Figaro ) by multiplicative factor estimated from calibration measurements in ethanol. 

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