Oxygen alarm detection range:

The oxygen concentration detection is achieved by detecting the volume ratio of oxygen. The detection range is divided into two ranges, and 0-30% VOL is commonly used in general industry, A small number of industries choose to purchase instruments with a full range of 0-100% VOL. Choosing too large a range will affect the accuracy of the oxygen alarm. Choosing a small range is at least slightly larger than 23% VOL. Therefore, in the gas security industry, the detection range of the oxygen alarm is locked at 0-30% VOL.

under normal circumstances, in the process of realizing alarm work setting, less than 19.2 VOL belongs to the first-level alarm state, and more than 23% VOL belongs to the second-level alarm state. as long as the detection range of oxygen alarm is between 19.2-23% VOL, this means that the oxygen concentration in the field is within a safe range.

therefore, for the oxygen alarm, it should be able to detect and display the oxygen concentration value under various environmental conditions, including under oxygen condition, I .e. 0-19.5%; Under the condition of excess oxygen, I .e. above 23.5; And the normal concentration value, that is, 19.5 to 23.5% range. Taking into account the oxygen state is generally more open space, oxygen partial pressure increment is limited, so generally can choose 0-25% VOL or 0-30% VOL oxygen alarm.