How it works

Using an array of digital temperature sensors moulded into the centre stem the temperature profile of the scrubber is monitored in real-time. As the CO2 laden exhaled breath passes through the scrubber the temperature of each section is compared with the other sensors and the bar-display on the wristset is updated to show the hot sections of the scrubber and by this means the exothermic reaction of the Sofnolime is tracked through the bed.

By using a comparative method, rather than monitoring actual temperatures, the APD Scrubber Monitor performs reliably and consistently in cold as well as warm water, it copes with ascents and descents, and even works with part-used Sofnolime, giving warnings at appropriate times on the HUDs and buzzer.

By extensive testing at the APD Research Laboratory the warning levels were determined at two very simple levels – Surface immediately and Go open circuit.