SleepSense PTFlow Sensors are designed with a hanger on the back to hold a pressure cannula in place for simultaneous measurements. Comprising three heat sensitive elements, the respiration flow sensor is placed under the patient's nostrils and produces a signal that is directly proportional to the temperature changes of air inhaled and exhaled during respiration. The sensor generates a small analog electrical voltage that provides a clear, reliable indication of respiration airflow. The sensors should be connected to the systems thermal-flow input. Designed for use with Alice 6 systems.