CONSTANT POTENTIAL ELECTROLYTIC GAS SENSOR

To provide a constant potential electrolytic gas sensor that detects oxygen gas and toxic gas, the constant potential electrolytic gas sensor capable of preventing variations in concentration indicated value of toxic gas even when the concentration of oxygen gas in detection target gas is rapidly reduced and when an environmental temperature is changed.SOLUTION: A constant potential electrolytic gas sensor detects oxygen gas and toxic gas, and comprises: a sheet-like electrolytic solution holding member that is impregnated with an electrolytic solution; a working electrode for oxygen gas and a working electrode for toxic gas that are arranged separate from each other on a top face of the electrolytic solution holding member; and a counter electrode and a reference electrode that are arranged separate from each other on an under surface of the electrolytic solution holding member. In perspective view in a thickness direction of the electrolytic solution holding member, the area in which the working electrode for toxic gas and the counter electrode overlap each other is 0.SELECTED DRAWING: Figure 1 【課題】酸素ガスおよび毒性ガスを検知する定電位電解式ガスセンサにおいて、被検ガス中の酸素ガス濃度が急激に低下した場合や、環境温度が変化した場合であっても、毒性ガスの濃度指示値の変動を抑制することができる定電位電解式ガスセンサを提供する。【解決手段】酸素ガスおよび毒性ガスを検知する定電位電解式ガスセンサであって、電解液が含侵されたシート状の電解液保持部材と、前記電解液保持部材の上面に互いに離間して配置された、酸素ガス用作用極および毒性ガス用作用極と、前記電解液保持部材の下面に互いに離間して配置された対極および参照極とを備え、前記電解液保持部材の厚み方向に透視したとき、前記毒性ガス用作用極と前記対極とが重なる面積が０であることを特徴とする。【選択図】図１