Table 1.

Sensors and corresponding representative sensitive material types of the PEN3 electronic nose.

Array Number	Sensor Name	Description of Sensitivity	Sensitive Gas	Threshold (mL/m3)
1	W1C	Aromatic components and benzene	C7H8	10
2	W5S	Nitrogen oxides	NO2	1
3	W3C	Aromatic components with ammonia	C6H6	10
4	W6S	Selective for hydrides	H2	100
5	W5C	Aromatic components of short-chain alkanes	C3H8	1
6	W1S	Methyl groups	CH4	100
7	W1W	Sulfides	H2S	1
8	W2S	Alcohols, aldehydes, and ketones	CO	100
9	W2W	Aromatic components and organosulfides	H2S	1
10	W3S	Long-chain alkanes	CH4	100