ETS-Lindgren's Oxygen Monitoring System (OMS) is a sample draw monitoring system that alerts and alarms when oxygen levels fall below safe limits for human health. The OMS monitors the air in MRI rooms, labs, freezers, confined spaces, and other locations where inert gases such as helium, nitrogen and argon may displace the oxygen and create a danger for patients and staff. The OMS can be used indoors or outdoors.