Choosing the appropriate range for an oxygen detector requires consideration of the detection purpose, application scenarios, safety standards, and specific requirements. The following are recommended ranges for different scenarios:

1. Human safety testing0-30% VOL is a common measurement range used to prevent personnel from experiencing hypoxia.

2. Industrial boiler exhaust gas combustion emission detection：0-25%VOL， Oxygen detector using high-temperature zirconia principle.

3. High concentration oxygen detection：0-100%VOL， Used for purity testing of oxygen concentrators and oxygen concentration testing in the medical industry.

4. Industrial pipeline exhaust gas treatment：0-5%VOL， Used to control the oxygen content from exceeding the standard and prevent explosion accidents.

5. Trace oxygen detection0-10000ppm or 0-10000ppm, suitable for equipment vacuum pumping or high oxygen control requirements.

In addition, the national standard "GB/T50493-2019 Design Standard for Detection and Alarm of Combustible and Toxic Gases in Petrochemical Industry" stipulates that the peroxide alarm setting value is 23.5% VOL and the oxygen deficiency alarm setting value is 19.5% VOL.

In summary, when selecting the range of an oxygen detector, it should be based on actual application requirements and safety standards, and ensure that the instrument has corresponding accuracy, response time, and alarm functions. At the same time, considering key parameters such as sensor types and technical specifications, such as electrochemical sensors, paramagnetic/zirconia sensors, or optical/laser sensors, as well as explosion-proof and protection levels