| 摘要 |
<p>A method for indicating a condition of oxygen depletion in a space, is disclosed. The method of measuring oxygen depletion is employed using the rate of change of carbon dioxide as a surrogate indicator of the amount of oxygen being depleted or displaced in the air. Displacement may be measured when the rate of change of carbon dioxide concentration falls within a rate of change range, or rises above or falls below a rate of change threshold level that indicates the displacement of oxygen.</p> |
