Abstract: The present invention has as its object the provision of a controlled potential electrolysis gas sensor capable of speedily obtaining a state in which gas concentration measurement can be conducted after the activation of a power source. The controlled potential electrolysis gas sensor is configured to include at least a working electrode and a counter electrode which are provided in contact with an electrolytic solution and to detect a concentration of a detection target gas in a gas to be tested by detecting a current flowing between the working electrode and the counter electrode in a state in which the working electrode is controlled at a constant set potential. The controlled potential electrolysis gas sensor includes an operation control circuit that drives the controlled potential electrolysis gas sensor based on a current in a forward direction detected when the controlled potential electrolysis gas sensor is activated under energization conditions at the time of a gas detection operation.

Abstract: The present invention has as its object the provision of a controlled potential electrolysis gas sensor capable of speedily obtaining a state in which gas concentration measurement can be conducted after the activation of a power source. The controlled potential electrolysis gas sensor is configured to include at least a working electrode and a counter electrode which are provided in contact with an electrolytic solution and to detect a concentration of a detection target gas in a gas to be tested by detecting a current flowing between the working electrode and the counter electrode in a state in which the working electrode is controlled at a constant set potential. The controlled potential electrolysis gas sensor includes an operation control circuit that drives the controlled potential electrolysis gas sensor based on a current in a forward direction detected when the controlled potential electrolysis gas sensor is activated under energization conditions at the time of a gas detection operation.

Abstract: Provided is a potentiostatic electrolytic gas sensor that can perform gas detect with high reliability. In the potentiostatic electrolytic gas sensor, a working electrode and a counter electrode are provided inside a casing with an electrolytic solution interposed therebetween. A working electrode lead member is drawn out of the casing at one end, and electrically connected to the working electrode at the other end. A counter electrode lead member is drawn out of the casing at one end and electrically connected to the counter electrode at the other end. The potentiostatic electrolytic gas sensor is characterized in that at least one of the working electrode lead member and the counter electrode lead member is made of a metal selected from gold, tungsten, niobium, and tantalum.