Table 1.
Sensors in PEN3 E-nose system and their sensitivity description.
| Number | Name | Sensitive Substances | Reference |
|---|---|---|---|
| S1 | W1C | Aromatic compounds | Toluene, 10 ppm |
| S2 | W5S | Very sensitive, broad range sensitivity, react on nitrogen oxides, very sensitive with negative signal | NO2, 1 ppm |
| S3 | W3C | Ammonia, used as sensor for aromatic compounds | Propane, 1 ppm |
| S4 | W6S | Mainly hydrogen, selectively, (breath gases) | H2, 100 ppb |
| S5 | W5C | Alkanes, aromatic compounds, less polar compounds | Propane, 1 ppm |
| S6 | W1S | Sensitive to methane (environment) ca. 10 ppm. Broad range, similar to No. 8 | CH3, 100 ppm |
| S7 | W1W | Reacts on sulphur compounds, H2S 0.1 ppm. Otherwise sensitive to many terpenes and sulphur organic compounds, which are important for smell, limonene, pyrazine | H2S, 1 ppm |
| S8 | W2S | Detects alcohol’s, partially aromatic compounds, broad range | CO, 100 ppm |
| S9 | W2W | Aromatics compounds, sulphur organic compounds | H2S, 1 ppm |
| S10 | W3S | Reacts on high concentrations >100 ppm, sometime very selective (methane) | CH3, 10CH3, 100 ppm |