Table 1.
Sensors used in the E-nose. Many of the below sensors have responses to alcohol, but their responses to these key chemicals are different among suppliers, providing an increased amount of chemical information.
| Sensor Type | No. | Related Sensitivity | Manufacturers |
|---|---|---|---|
| TGS826 | 1 | Isobutane, ethanol, ammonia, hydrogen | FIGARO, Osaka, Japan |
| TGS813 | 2 | Methane, propane, isobutane | FIGARO, Osaka, Japan |
| TGS822 | 3 | Ethanol, organic solvents | FIGARO, Osaka, Japan |
| TGS 2600 | 4 | Cigarette smoke | FIGARO, Osaka, Japan |
| TGS 2602 | 5 | Volatile Organic Compounds (VOCs), ammonia, hydrogen sulfide | FIGARO, Osaka, Japan |
| MQ135 | 6 | Ammonia, sulfide, BTEX, acetone, toluene, ethanol, carbon monoxide | Winsen, Zhengzhou, China |
| MQ138 | 7 | Alcohols, ketones, aldehydes, aromatics, organic solvents | Winsen, Zhengzhou, China |
| WSP2111 | 8 | Toluene, benzene, ethanol, acetone | Winsen, Zhengzhou, China |
| SP3S-AQ2 | 9 | VOC, hydrogen, ethanol, methane, ammonia | FIS, Hyogo, Japan |
| MPX4100AP | 10 | Atmospheric pressure | Freescale, Austen, TX, USA |
| DS600 | 11 | Temperature | MAXIM, Sunnyvale, CA, USA |
| HIH4000 | 12 | Humidity | Honeywell, Morristown, NJ, USA |