Scuba Diving International (SDI) Computer Nitrox Practice Exam

What best describes the role of a blender when filling Nitrox cylinders?

1. To supply the gas requested by the diver

2. To analyze the oxygen content

3. To recommend dive plans

4. To check for leaks

The correct answer is: To supply the gas requested by the diver

The role of a blender when filling Nitrox cylinders primarily involves supplying the gas requested by the diver. This means that the blender is responsible for ensuring that the correct mixture of oxygen and nitrogen is provided according to the specifics of the diver's needs, which are typically based on their planned dive profile. A blender must be aware of the different Nitrox mixes, as divers may require various oxygen percentages based on the depth and duration of their dives to meet safety and physiological requirements. Understanding the diver's specifications ensures that the filled cylinders will support the intended dive safely. While the analysis of oxygen content is also essential for confirming that the proper mix has been achieved, it is a separate process from the blending itself. Likewise, recommending dive plans and checking for leaks are important aspects of diving safety and preparation, but they do not directly pertain to the primary role of a blender in the cylinder-filling process.