Abstract: The invention relates generally to ceramic oxygen generating modules, and more particularly, to an apparatus and method for controlling a duty cycle for each of a plurality of ceramic oxygen generating modules in a modular ceramic oxygen generating system.

Abstract: The present invention is directed to an apparatus for supplying gas at a first pressure and at a second pressure. The apparatus includes a gas generating system having a gas generating system outlet. A flow switch is in communication with the gas generating system outlet and has an outlet thereof forming a gas outlet at the first pressure. A pressure regulator is in communication with the gas generating system outlet for regulating gas flowing to the gas outlet at the first pressure. A solenoid valve is electrically controlled by the flow switch and is in communication with the gas generating system outlet and has a solenoid valve outlet. A pressure intensifier is in communication with the solenoid valve for raising the pressure of the gas generated by the gas generating system for output to an outlet at a second pressure.

Abstract: Apparatus for measuring concentration of oxygen includes a plurality of status displays, identifying concentration status relative to a plurality of thresholds, an alarm for immediate and prominent identification of status relative to a threshold of particular significance, and a quantitative display indicative of an actual concentration. Although measurements are performed and results are indicated relative to a number of thresholds, only a single calibration procedure is required, using only a single calibration gas. The apparatus is calibrated by adjusting a circuit parameter of one of the circuit components to vary a sensed output value to correspond to a narrow range surrounding the known concentration of the calibration gas. Both the circuit parameter and the actually sensed output value are stored. In a monitoring operation, the circuit parameter is retrieved to reset the circuit component to its calibrated setting.

Abstract: Apparatus for monitoring gaseous oxygen concentration that includes an oxygen sensor for providing an electrical sensor signal that varies as a function of oxygen concentration at the sensor. Processor circuitry compares oxygen concentration indicated by the sensor signal to at least one threshold level, and indicates when such oxygen concentration at the sensor departs from such threshold concentration level. The apparatus is calibrated by exposing the sensor to a calibration gas having an oxygen concentration equal to the desired threshold concentration level, and storing in the processor circuitry electrical indicia indicative of operating characteristics of the sensor at such threshold oxygen concentration level.