Table 2.
Sensors used and their main applications in PEN3 electronic nose.
| In array | Sensor name | Description | Reference material |
|---|---|---|---|
| 1 | W1C-aromatic | Aromatic compounds | Toluene, 10 ppm |
| 2 | W5S-broad-range | Broad-range sensitivity; reacts to nitrogen oxides and ozone, very sensitive, with negative signal | NO2, 10 ppm |
| 3 | W3C-aromatic | Ammonia, used as sensor for aromatic compounds | Benzene, 10 ppm |
| 4 | W6S-hydrogen | Mainly hydrogen; selective (respiration gases) | H2, 100 ppb |
| 5 | W5C-arom-aliph | Alkanes, aromatic compounds, less polar compounds | Propane, 1 ppm |
| 6 | W1S-broad-methane | Sensitive to methane (environmental) ca. 10 ppm; broad range, similar to #8 | CH4, 100 ppm |
| 7 | W1W-sulphur-organic | Reacts to sulfur compounds at H2S 0.1 ppm. Otherwise sensitive to many terpenes and sulfur organic compounds that are important for aroma, including limonene and pyrazine | H2S, 1 ppm |
| 8 | W2S-broad-alcohol | Detects alcohols, partially aromatic compounds; broad range | CO, 100 ppm |
| 9 | W2W-sulphur-chlor | Aromatic compounds, sulfur organic compounds | H2S, 1 ppm |
| 10 | W3S-methane-aliph | Reacts to high concentrations >100 ppm, sometimes very selective (methane) | CH4, 10 ppm |