Methods, apparatuses, and systems for detecting catalytic pellistor poisoning of a gas sensing apparatus including a resistor, a detector, and a compensator are provided. The method includes sampling a voltage reading of the resistor, calculating an electric current value of a gas sensing apparatus circuit based on the sampled voltage reading of the resistor, sampling voltage readings associated with the detector and the compensator for a duration of time, calculating resistance values of the detector and resistance values of the compensator based on the sampled voltage readings from the detector and the compensator, comparing the resistance values of the detector with the resistance values of the compensator, and identifying poisoning of the gas sensing apparatus based on the comparison.

In an embodiment, a hydrogen monitoring system comprises a plurality of sensing elements that individually comprise a working electrode, a counter electrode, an insulating layer located in between the working electrode and the counter electrode, a catalyst located on an end of both the working electrode and the counter electrode, an electrolyte located on the end of the sensing elements on both the working electrode and the counter electrode, between the working electrode and the counter electrode, and in contact with the catalyst, and an electrical circuit located on an opposite end of the sensing element that connects the working electrode and the counter electrode.

An electrochemical method for determining the sensitivity of at least one gas sensor. The method includes applying at least two electrical pulses to at least two parts of at least two electrodes of the gas sensor, recording the change of the current pattern induced in the at least two electrodes by the at least two pulses over time, calculating at least one value for the sensor sensitivity by applying an algorithm to the current pattern induced by the at least two pulses, and comparing the calculated sensitivity value to known gas sensitivity calibration data.

A sensor is driven at a first heating power value. The sensor generates a sensing signal that is indicative of a sensed entity. A possible onset of a sensor contamination condition is detected as a function of the sensing signal generated by the sensor. If such detecting fails to indicate onset of a sensor contamination condition, the sensor continues to be driven at the first heating power value. However, if such detecting indicates onset of a sensor contamination condition, a protection mode is activated. In the protection mode, the sensor is driven at a second heating power value for a protection interval, where the second heating power value is lower than the first heating power value. Furthermore, the operation may refrain from supplying power to the sensor for a further protection interval, wherein the further protection interval is longer than the protection interval.

Environmental conditions affecting a sensor having a thermal coefficient are compensated by applying an adaptive filter to an environmental condition reference signal. The resulting adaptive cancellation signal may be used to provide feedback control to a first heating element.

A method for reducing sensor noise in an automobile vehicle NOx sensor offset diagnostic includes: connecting an exhaust system to an engine of an automobile vehicle; sensing a condition of the exhaust system using at least one NOx sensor; identifying when the at least one NOx sensor is at a low noise condition; and running a diagnostic to identify conditions of the at least one NOx sensor. The method further includes selecting one of the low noise condition as the engine in an after-run condition or as the engine in an engine idle condition.

A maintenance method for a zirconia-type oxygen analyzer that uses a zirconia sensor to measure oxygen concentration of a gas to be measured includes storing in a memory, by the zirconia-type oxygen analyzer, an internal resistance of the zirconia sensor and/or a calibration coefficient for correcting, based on a measured value of a physical quantity measured by the zirconia sensor for a standard gas having a known oxygen concentration, a formula for converting a measured value of a physical quantity measured by the zirconia sensor into the oxygen concentration of the gas to be measured, determining, by an information processing apparatus, the timing for performing maintenance on the zirconia sensor based on a change over time in the internal resistance and/or calibration coefficient stored in the memory, and presenting, by the information processing apparatus, the timing for performing maintenance on the zirconia sensor.

The invention relates to a detection system for an electronic nose capable of detecting and identifying a set of compounds that can be found in a gaseous sample, the detection system comprises a plurality of cross-reactivity detection sensors (D1, D2, D3, D4, D5, D6, D7) for supplying signals representing the presence of one or more compounds of said set in the gaseous sample, and which is particularly characterised in that the detection system further comprises at least one reference sensor (RI) for supplying a signal representing the measurement noise of the detection system. The detection system further relates to an electronic nose comprising such a detection system.

A multi-point air sampling system that can use a field reference subsystem to process sensor feedback to efficiently and reliably monitor and improve air quality within a space. The field reference subsystem can interface with multiple types of multi-point air sampling systems to ensure that sensors are operational and producing accurate measurements. Included within the field reference subsystem can be one or more permeation sources for generating test gases used to evaluate the integrity of the sensors, a processor for receiving the results of the test-gas evaluations to recurrently verify the operation level of each sensor, and a reporting system for carrying out actions in response to the recurrent verification of the sensors.

A method for reducing sensor noise in an automobile vehicle NOx sensor offset diagnostic includes: connecting an exhaust system to an engine of an automobile vehicle; sensing a condition of the exhaust system using at least one NOx sensor; identifying when the at least one NOx sensor is at a low noise condition; and running a diagnostic to identify conditions of the at least one NOx sensor. The method further includes selecting one of the low noise condition as the engine in an after-run condition or as the engine in an engine idle condition.