During a confined space entry, how often must the confined space be monitored for hazardous atmospheres?

Monitoring a confined space for hazardous atmospheres continuously is crucial for ensuring the safety of personnel involved in the entry. This practice is essential because atmospheric conditions can change rapidly due to various factors, including the activities taking place within the space, the introduction of tools or equipment, or changes in external environmental conditions. Continuous monitoring allows for immediate detection of any harmful gases, oxygen deficiency, or other hazardous conditions, providing real-time data that can inform the decisions of safety personnel.

On the other hand, sporadic monitoring, such as only before entry or at fixed intervals, does not guarantee that workers are protected throughout their time in the confined space. Given that hazardous atmospheres can develop quickly and unpredictably, relying solely on pre-entry testing or periodic checks may leave workers at risk. Thus, continuous monitoring stands as the most effective approach to ensure safety throughout the duration of the entry.