A method for calibrating an exhaust gas sensor arranged in a measurement chamber, includes providing a measurement chamber in or adjacent to an exhaust channel of an internal combustion engine. At the start of a calibration phase, exhaust gas present in the measurement chamber is displaced by a filling of the measurement chamber with calibration gas, and at the end of the calibration phase, exhaust gas diffuses into and/or is introduced into the measurement chamber.

A gas sensor includes a main pump cell, a storage unit that stores information about a zero point in a first correspondence relationship, where the first correspondence relationship is a linear correspondence relationship between the oxygen concentration in a measurement-object gas and the main pump current, an oxygen-concentration-detecting unit that detects the oxygen concentration in a measurement-object gas, based on a measured value p of the main pump current and the information about the zero point, and a measured-value-obtaining unit that performs a second control process and that obtains a measured value b1 at a measurement point B1 at which a known value of the oxygen concentration and the main pump current are relevant to each other with a measurement timing. The oxygen-concentration-detecting unit makes zero point correction such that a divergence of the zero point from the first correspondence relationship is corrected based on the measured value b1.

An inspection apparatus capable of performing responsivity inspection on a plurality of gas sensors at equivalent accuracies is provided. The inspection apparatus includes a plurality of inspected sensor disposing parts that are provided halfway through one gas flow path at equal intervals in an extending direction of the flow path and in each of which a gas sensor to be inspected is disposed, and a plurality of straightening plates provided upstream of each of the inspected sensor disposing parts on the gas flow path and separated at a constant distance from the inspected sensor disposing parts. The straightening plates each include a rectangular opening orthogonal to the gas flow path and open to the gas flow path. When the gas flow path extends in one direction in a horizontal plane, the opening has a longitudinal direction along a direction orthogonal to the one direction in the horizontal plane.

Provided is a method for manufacturing a gas sensor which suppresses a defective product caused by a defective posture of a sensor element therein. The method includes a step of obtaining an assembled body constituting the gas sensor, including steps of: causing one end of the sensor element to come to abut to a positioning member for positioning the sensor element; and applying a first force to the annularly-mounted members including a powder compact annularly mounted to the sensor element under a state that the sensor element is positioned and thereby compressing the powder compact so as to fix the sensor element inside of the tubular body, and the compression is performed while constraining the sensor element in a predetermined constraining region in the other end side of the sensor element.

A multi-gas detection apparatus is configured such that electric power supplied from a power supply to a heater is controlled by pulse width modulation so as to control the temperature of a first solid electrolyte body. The multi-gas detection apparatus detects the concentration of ammonia by using a first ammonia detection section in which an electromotive force is generated between a first reference electrode and a first detection electrode in accordance with the concentration of ammonia in the exhaust gas. The multi-gas detection apparatus calculates the amount of a change (i.e., offset voltage) in the ammonia electromotive force caused by change in the output voltage of the power supply. The multi-gas detection apparatus corrects the ammonia electromotive force generated in the first ammonia detection section through use of the calculated change amount.

A system includes: a NO.sub.x sensor; and a controller configured to: increase an amount of O.sub.2 in a chamber of the NO.sub.x sensor; interpret one or more values of a parameter indicative an amount of O.sub.2 and/or NO.sub.x measured by the NO.sub.x sensor; determine if the one or more values of the parameter exceed a threshold value; and indicate a failure of the NO.sub.x sensor responsive to the one or more values of the parameter do not exceed the threshold value.

A method for producing a gas sensor device for detecting a gaseous analyte includes providing a sensor body comprising a semiconductor substrate, in which a cavity section is shaped, and a solid electrolyte layer arranged at a surface of the substrate. The electrolyte layer is not covered by the substrate in the cavity section. The method includes producing a signal conductor layer deposited dry-chemically at a substrate side of the sensor body, such that, in the region of the electrolyte layer not covered by the substrate in the cavity section, a cutout section is shaped in the signal conductor layer, in which the signal conductor layer is removed or not deposited. The method includes applying measuring electrodes to the electrolyte layer by a wet-chemical process. One measuring electrode is arranged in the cutout section and one measuring electrode is arranged on an electrolyte layer side of the sensor body.

Provided is a method of inspecting an assembly defect of a gas sensor in a mass-production process. The sensor element included in a second constituting member includes a heater therein and an electrode terminal for a heater in its surface, and the first constituting member includes a contact point member contacting the terminal in a state where the sensor element is inserted into its opening. A first heater resistance value before incorporated is measured to associate the resistance value with an identification information of the sensor element, a second heater resistance value is measured via a contact point member, in a state where the first and second constituting members are integrated with each other, to associate the resistance value with the identification information of the sensor element, and when a difference value between these resistance values associated with the identical identification information exceeds a threshold value, it is determined that an assembly defect occurs.

The invention aims to suppress an effect of noise and heat generated from a memory on a measurement result in an ion concentration measuring device that uses an ion detection element for outputting a potential corresponding to the concentration of ions. The ion concentration measuring device according to the invention includes a cartridge having an ion detection element and a memory and supplies power to the memory in a time period excluding a time period for which the potential generated by the ion detection element is acquired.

An automated analyzer includes two or more types of photometers to obtain suitable output of the measurement results of the plurality of photometers and suitable data alarm output even if there is an abnormality, or the like, at the time of measurement. The automated analyzer includes, for example, two types of photometers having different quantitative ranges and an analysis control unit for controlling analysis that includes measurement of a given sample using the two types of photometers. If two types of data alarms corresponding to abnormalities, or the like, during measurement have been added to the two types of measurement results from the two types of photometers, the analysis control unit selects measurement result and data alarm output corresponding to the combination of the two types of data alarms and outputs the same to a user as analysis results.