When your portable unit is set to 1 or above, oxygen will be delivered only when you inhale. You should notice a small pulse at the beginning of each breath. Oxygen is delivered during this pulse, and continues as long as you inhale. Oxygen flow stops when you stop inhaling. It is normal for the device to occasionally skip a breath or to pulse twice in one breath.
When your portable unit is set below 1, oxygen is delivered continuously at the rate displayed on the flow control knob. For example, the .5 setting delivers continuous flow oxygen at .5 L/min.
The table above shows approximate use times for your portable unit after it has been completely filled. The table below was constructed using a breathing pattern that is typical for oxygen patients. Your use time may vary substantially from the use time listed below. You should learn through experience how long the Portable unit will last under your circumstances. The table above of approximate use times is correct even though in some cases it doesn't seem logical. For example, the .75 setting doesn't last as long as the 1 setting because the .75 setting is continuous flow and the 1 setting is demand flow. Also, the 1 setting doesn't last twice as long as the 2 setting because of unique properties of liquid oxygen.
