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Table 2 RMSE and NRMSE of TGS and MQ4 sensors at high and low methane concentrations

From: Assessment of the applicability of a low-cost sensor–based methane monitoring system for continuous multi-channel sampling

  TGS MQ-4
[CH4] % RMSE NRMSE RMSE NRMSE
3 0.2231 0.0788 - -
4 0.2795 0.0696 - -
6 0.6380 0.1198 - -
7 0.4973 0.0719 - -
0.096 0.0062 0.0641 0.0302 0.3143
0.145 0.0254 0.1749 0.0836 0.5766
0.193 0.0030 0.0157 0.1216 0.6301
0.240 0.0389 0.1613 0.1653 0.6859