Abstract: A circuit interrupting device including a line terminal, a current sensor to measure a current flowing through the line terminal, a zero cross detection circuit to measure a voltage and a frequency of the line terminal, and a microcontroller. The microcontroller configured to apply a digital filter to a line current measurement signal, determine zero cross positions of a line voltage measurement signal, count a plurality of turning points of the filtered line current measurement signal, determine a position of each of the plurality of turning points relative to a corresponding zero cross position, determine a time between each turning point and subsequent turning point, and determine whether an arc fault is present within the circuit interrupting device based on the plurality of turning points, the position of each turning point relative to the corresponding zero cross position, and the time between each turning point and the subsequent turning point.

Abstract: A wiring device including an enclosure including a front cover and a rear cover, a first printed circuit board (PCB) disposed within the enclosure, a first direct current (DC) port, a plurality of power electronics supported by a surface of the first PCB and configured to provide power to the first DC port, and a heat sink in direct contact with at least one of the plurality of power electronics and disposed within an interior of the rear cover.

Abstract: An embodiment of a gas analyzer is described that comprises a light source configured to produce a substantially collimated first beam with a diverging angle of less than about 15 degrees; a gas cell comprising an inlet configured to introduce a gas into the gas cell, an outlet configured to remove the gas from the gas cell, and a plurality of mirrors configured to reflect the substantially collimated first beam within the gas cell; and a detector configured to generate a signal in response to the substantially collimated first beam.

Abstract: An embodiment of a gas analyzer is described that comprises a light source configured to produce a substantially collimated first beam with a diverging angle of less than about 15 degrees; a gas cell comprising an inlet configured to introduce a gas into the gas cell, an outlet configured to remove the gas from the gas cell, and a plurality of mirrors configured to reflect the substantially collimated first beam within the gas cell; and a detector configured to generate a signal in response to the substantially collimated first beam.