Final line filters for instrument air must be equipped with which type of visual indicator?

Final line filters for instrument air should be equipped with a continuous visual indicator. This type of indicator is crucial because it provides an ongoing, real-time assessment of the filter's operational status and condition. A continuous visual indicator allows personnel to monitor the pressure drop across the filter continuously, indicating when maintenance or a filter change is needed.

In the context of medical gas systems, maintaining the integrity of instrument air is essential for the proper functioning of medical equipment. A continuous visual indicator enhances safety by ensuring that operators are aware of any changes in the filter's performance immediately, allowing for timely intervention if the filter becomes saturated or blocked. This proactive approach can help prevent disruptions in the medical gas supply and ensure that equipment operates optimally.