#$%^&*AU2017232196B220190711.pdf#####- 22ABSTRACT Disclosed herein is an apparatus for supplying gases to a patient comprising: a casing, a flow generator comprising a fan to provide a gases flow, a humidifier with a heater plate, an unsealed nasal cannula for a patient, a controller, and a valve operable as a flow control mechanism to: 5 adjust the flow rate of gases through the system and/or provide an 02 fraction to the user. The humidifier and flow generator are integrated in the casing. The controller is configured to adjust the output of the flow generator by controlling the fan speed. The controller is configured to monitor system conditions during use of the apparatus and determine a possible absence of water in the humidifier chamber based on the monitored system conditions. [01/9 Monitor System Conditions 1050 1010 Dosstem conditions indicate N possible water out condition? Y 1030 Take control of heater power supply Monitor heater plate Temperature 1100 Does heater plate temperature indicate aN water out condition? Y 112 0 Provide output of a water out condition I ~FIGURE 1 1110 Reduce or remove power to heater
