Abstract: 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.

Abstract: An electrochemical gas sensor includes a housing comprising a gas inlet, an electrolyte within the housing, a working electrode in ionic contact with the electrolyte, a counter electrode in ionic contact with the electrolyte and a secondary electrode in ionic contact with the electrolyte. Reaction of target gas at the secondary electrode is less than reaction of target gas at the working electrode. Electronic circuitry of the gas sensor is configured to measure an output from the working electrode and an output from the at least one secondary electrode. A correction factor is determined for correcting the output from the working electrode on the basis of the working electrode output and the secondary electrode output during an assessment in which the electrochemical sensor is exposed to the target gas for a determined period of time.

Abstract: An electrochemical gas sensor for detecting a target gas includes a housing comprising at least one gas inlet, an electrolyte within the housing, at least one working electrode in ionic contact with the electrolyte, at least one counter electrode in ionic contact with the electrolyte and at least one secondary electrode in ionic contact with the electrolyte. The secondary electrode is configured so that reaction of the target gas entering the housing via the at least one gas inlet at the at least one secondary electrode is less than reaction of the target gas at the least one working electrode. The electrochemical gas sensor further includes electronic circuitry in operative connection with the at least one working electrode, the at least one counter electrode and the at least one secondary electrode. The electronic circuitry is configured to measure an output from the at least one working electrode, and to measure an output from the at least one secondary electrode.

Abstract: 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.