In applications of nitrogen (N<sub>2</sub>) generation, industrial gas manufacturing and food packaging there is a need to ensure oxygen (O<sub>2</sub>) is absent from the environment, even at the lowest concentration levels. Therefore, there has been an increased growth in the development of trace O<sub>2</sub> parts per million (ppm) sensors over the past decade to detect and quantify the concentration of molecular O<sub>2</sub> in the environment whether it be dissolved or gaseous O<sub>2</sub>. The majority of commercially available trace O<sub>2</sub> sensors are based on electrochemical, zirconia and paramagnetic technologies. Here, the development of a luminescence-based optical trace O<sub>2</sub> sensor is presented. Luminescence-based sensing is now regarded as one of the best techniques for the detection and quantification of O<sub>2</sub>. This is due to the high detection sensitivity, no O<sup>2</sup> is consumed and there are a vast array of luminescent indicators and sensing platforms (polymers) that can be selected to suit the desired application. The sensor will be shown to operate from -30 °C to +60 °C in the 0–1000 ppm and/or 0–1200 μbar partial pressure of oxygen (ppO<sub>2</sub>) range and is equipped with temperature and pressure compensation. The luminescence non-depleting principle, sensor specifications and miniaturized nature offers an attractive alternative to other sensing technologies and advantages over other luminescence-based O<sub>2</sub> ppm sensors.