SleepSense PTFlow Sensors are designed with a hanger on the back to firmly hold a pressure cannula in place. Comprised of three heat sensitive elements, the SleepSense 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 sensor should be connected to the system's thermal-flow input. Designed for use with Alice 5 systems.