. 2014 Dec 23;15(1):1–21. doi: 10.3390/s150100001

Table 3.

Overview of the gas sensors implemented in the e-nose [46].

Type	Description	Detection Range [ppm]	Heating Element:	Sensing Element:	Sensitivity (Change Ratio)

			Voltage Resistance Current Power	Voltage Load Resistance Power Resistance in Gas
			TGS2600-B00 Figaro	general air contaminants		1–30 (H₂)	5.0 ± 0.2 V	5.0 ± 0.2 V	0.3–0.6 for $\frac{R s (10 ppm H_{2})}{R s (air)}$
							83 Ω	>0.45 kΩ
42 ± 4 mA	<15 mW
210 mW	10–90 kΩ clean air

TGS2602-B00 Figaro	general air contaminants (high sensitivity to VOC and odorous gases)	1–30 (EtOH)	5.0 ± 0.2 V	5.0 ± 0.2 V	0.15–0.5 for $\frac{R s (10 ppm EtO)}{R s (air)}$
			59 Ω	>0.45 kΩ
			56 ± 5 mA	<15 mW
			280 mW	10–100 kΩ clean air

TGS2610-C00 Figaro	butane. LP gas	500–10,000	5.0 ± 0.2 V	5.0 ± 0.2 V	0.56–0.06 for $\frac{R s (3000 ppm)}{R s (1000 ppm)}$
			59 Ω	>0.45 kΩ
			56 ± 5 mA	<15 mW
			280 mW	0.68–6.8 kΩ iso-butane
				1800 ppm

TGS2610-D00 Figaro	butane. LP gas (carbon filter)	500–10,000	5.0 ± 0.2 V	5.0 ± 0.2 V	0.56–0.06 for $\frac{R s (3000 ppm)}{R s (1000 ppm)}$
			59 Ω	>0.45 kΩ
			56 ± 5 mA	<15 mW
			280 mW	0.68–6.8 kΩ iso-butane
				1800 ppm

TGS2611-C00 Figaro	methane. natural gas	500–10,000	5.0 ± 0.2 V	5.0 ± 0.2 V	0.6–0.06 for $\frac{R s (9000 ppm)}{R s (3000 ppm)}$
			59 Ω	>0.45 kΩ
			56 ± 5 mA	<15 mW
			280 ± 25 mW	0.68–6.8 kΩ methane
				5000 ppm

TGS2611-E00 Figaro	methane. natural gas (carbon filter)	500–10,000	5.0 ± 0.2 V	5.0 ± 0.2 V	0.6–0.06 for $\frac{R s (9000 ppm)}{R s (3000 ppm)}$
			59 Ω	>0.45 kΩ
			56 ± 5 mA	<15 mW
			280 ± 25 mW	0.68–6.8 kΩ methane
				5000 ppm

TGS2612-D00 Figaro	methane. propane. iso-butane, solvent vapors	1%–25% LEL	5.0 ± 0.2 V	5.0 ± 0.2 V	0.5–0.65 for $\frac{R s (9000 ppm)}{R s (3000 ppm)}$
			59 Ω	>0.45 kΩ
			56 ± 5 mA	<15 mW
			280 mW	0.68–6.8 kΩ methane
				5000 ppm

TGS2620-C00 Figaro	alcohol. solvent vapors	50–5,000	5.0 ± 0.2 V	5.0 ± 0.2 V	0.3–0.5 for $\frac{R s (300 ppm)}{R s (50 ppm)}$
			83 Ω	>0.45 kΩ
			42 ± 4 mA	<15 mW
			210 mW	1–5 kΩ ethanol 300 ppm