Abstract: A pre-calibrated gas sensor is disclosed. The gas sensor includes a cathode and an anode for outputting a current signal responsive to a sensed oxygen concentration and a signal processing module in communication with the cathode and the anode and configured to receive the current signal and to output a pre-calibrated signal representative of the sensed gas concentration based on a value of the received current signal.

Abstract: A gas sensor includes an electrochemical cell. The electrochemical cell includes a body defining a cavity to contain a predetermined volume of electrolyte solution. The plurality of electrodes is disposed within the cavity and comprises an electrically conductive material that is substantially free of hazardous material. An energy module is coupled to the plurality of electrodes. The energy module provides a bias voltage suitable to reduce gas diffused in the electrolyte solution. An electrical interface is coupled to the energy module. The electrical interface has an electrical and mechanical form-factor to enable the gas sensor to replace a lead-based anode galvanic oxygen gas sensor as a drop-in replacement.

Abstract: A method is provided for detecting imminent failure of an electrochemical cell, such as an electrochemical oxygen sensor, including detecting the presence of a gas pocket in/over the electrolyte within the cell either optically, by differences in the path of a light beam through the cell, due to the different refractive indices of air or nitrogen gas and electrolyte solutions or electrically, by loss of electrolyte between a pair of electrodes. An electrochemical cell assembly also is provided having a gas pocket detection assembly. Lastly, a method for retrofitting an electrochemical cell with a gas pocket detection assembly also is provided, along with a kit for retrofitting a cell with a gas pocket detection assembly.

Abstract: An interface for coupling a fluid distribution component to a substrate, the interface including an opening therein for receiving at least a portion of the distribution component, the interface including at least one entering pathway and at least one exiting pathway engaging the opening and providing fluid communication between the fluid distribution component and the substrate. The coupling arrangements of the present invention provide a means by which distribution components, such as gas sensors, of various manufacturer designs may be interchangeable.

Abstract: A gas sensor comprising a housing and arranged such that a gas flow resistant member engages the housing and is sealably positioned to restrict the flow of gas into the opening leading to the cavity. Where the sensor is installed into a cell holder of the gas analyzer, the cell holder may include a gas flow resistant member opener to open the gas resistant member after being contained therein. In this way, the amount of gas to which the sensor is exposed during the transition period is substantially reduced. Accordingly, the amount of gas that diffuses into the electrolyte solution that would, otherwise, adversely affect the accurate and precise measurement of low concentrations of gas at the early stages of operation, is greatly diminished. As a result, the recovery time required for the excess gas to diffuse from the electrolyte is substantially reduced.

Abstract: An electrochemical gas sensor. One embodiment of the sensor may include a sensor body having a cavity, an electrolyte solution in the cavity, an auxiliary electrode in contact with the electrolyte solution, a sensing electrode in contact with the electrolyte solution, and a first baffle mounted within the cavity. The baffle comprises a plate with at least one aperture and serves to form a partial barrier for delaying the mixing process when liquid is added to the electrolyte solution. The sensor may also include a second such baffle. Also a method for mixing a liquid with electrolyte solution of an electrochemical sensor. The method includes forming a first barrier within the cavity and controlling the flow of the liquid introduced through the first barrier. The method may include forming a second such barrier and controlling the flow of the liquid through the first and second barriers.