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This paper investigated the response time, chloride selectivity, and temperature coefficients of the arrayed flexible ruthenium oxide chloride ion sensor in sodium chloride (NaCl) solutions with concentrations from 10^-5 M to 1 M. The response time was 7 s in 1 M NaCl solution at room temperature, showing that the sensor had the characteristics of the fast response. The selectivity coefficients of the SO₄^2- ion, NO₃^- ion, CO₃^2- ion, ClO^- ion, and ClO₄^- ion were 0.001, 0.056, 0.004, 0.015, and 0.006, respectively. The chloride ion sensing device had the good chloride selectivity. Finally, the sensitivity was investigated with different solution temperatures from 5 °C to 50 °C. The sensitivity was increased with higher solution temperature. The temperature coefficient of the sensitivity of the chloride ion sensing device was approximately 0.681 mV/pCl °C between 5 °C and 35 °C.