Ventilator Controls (IMAGE) University of California - San Diego Caption The ventilator is controlled by pressure sensors, rather than volume sensors, which allowed researchers to lower the device's price dramatically. Credit University of California San Diego Usage Restrictions Please credit University of California San Diego License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.