Which components should receivers for medical air be equipped with?

The correct selection focuses on the essential safety and operational features that a receiver for medical air must possess. Relief valves are critical as they ensure that if the pressure within the receiver exceeds safe levels, the excess pressure can be safely released, preventing potential ruptures or failures in the system. Automatic and manual drains are important to remove condensate that can accumulate in the receiver, ensuring that moisture does not contaminate the medical air supply. The sight glass provides a visual indication of the condensate level, allowing for easy monitoring and maintenance of the system.

In contrast, while the other options include various useful components, they do not encompass the specific requirements mandated for medical air receivers. Manual switches and pressure gauges are more relevant to operation and monitoring but do not directly ensure safety or manage condensate issues. Emergency shut-off valves and filters are important for overall system integrity but are not components specifically designated for receivers. Flow meters and pressure regulators are beneficial for controlling and measuring gas flow; however, they do not address the unique concerns associated with the receiver itself. Thus, the combination of relief valves, automatic and manual drains, and a sight glass provides a comprehensive safety and functionality solution for medical air systems.