How should the alarm threshold of a toxic gas detector be set?

Alarm thresholds for toxic gases are typically set based on Occupational Exposure Limits (OELs). The primary alarm threshold for toxic gases should be less than or equal to 100% OEL; the secondary alarm threshold should be less than or equal to 200% OEL, but should not exceed 10% IDLH（Immediately Dangerous to Life or Health concentration）.All practitioners in related fields should treat toxic gases with seriousness and caution, as this concerns the safety of lives.