Table 1.
Description of the sensors installed in the portable electronic nose PEN3 [15].
| Number | Sensor name | General description | Reference |
|---|---|---|---|
|
| |||
| 1 | W1S | Aromatic compounds | Toluene, 10 mg·kg−1 |
| 2 | W5S | Very sensitive, broad range sensitivity, react on nitrogen oxides, very sensitive with negative signal | NO2, 1 mg·kg−1 |
| 3 | W3C | Ammonia, used as sensor for aromatic compounds | Benzene, 10 mg·kg−1 |
| 4 | W6S | Mainly hidrogen, selectively | H2, 100 μg·kg−1 |
| 5 | W5C | Alkanes, aromatic compounds, less polar compounds | Propane, 1 mg·kg−1 |
| 6 | W1S | Sensitive to methane (environment) ca. 10 mg·kg−1. Broad range, similar to n. 8 | CH3, 100 mg·kg−1 |
| 7 | W1W | Reacts on sulphur compounds, H2S 0.1 mg·kg−1. Otherwise sensitive to many terpenes and sulphur organic compounds, which are important for smell, limonene, pyrazine | H2S, 1 mg·kg−1 |
| 8 | W2S | Detect alcohols, partially aromatic compounds, broad range | CO, 100 mg·kg−1 |
| 9 | W2W | Aromatic compounds, sulphur organic compounds | H2S, 1 mg·kg−1 |
| 10 | W3S | Reacts on high concentration >100 mg·kg−1, sometime very selective (methane) | CH3, 10 CH3, 100 mg·kg−1 |