Table 3.

Optimum operational parameters of sensors S0–S6 upon exposure to 10 ppm of H₂S.

Sample	R Air (Ω)	R Gas (Ω)	R Air/R Gas	Temperature (°C)
S0	1.10 × 106	8.43 × 103	1.31 × 102	225
S1	2.53 × 107	2.64 × 104	9.55 × 102	200
S2	2.50 × 108	1.85 × 105	1.88 × 103	200
S3	8.93 × 104	1.17 × 103	7.60 × 101	250
S4	6.90 × 106	6.99 × 102	9.87 × 103	150
S5	9.39 × 106	8.82 × 102	1.06 × 104	150
S6	3.21 × 105	6.65 × 102	4.83 × 102	150