When analyzing Nitrox content of a cylinder, what instrument is typically used?

An oxygen analyzer is used to measure the Nitrox content of a cylinder because it is specifically designed to analyze the percentage of oxygen in a gas mixture. This instrument operates by comparing the partial pressure of oxygen in a sample to known standards, allowing divers to ensure that the Nitrox mix they plan to use is accurately analyzed for safe diving.

Using the oxygen analyzer is crucial for ensuring that the gas mixture falls within the appropriate range for the type of dive being conducted, thereby helping to prevent oxygen toxicity and other related hazards. The instrument provides real-time, precise readings that divers or filling station personnel can rely on before preparing for a dive or refilling tanks.

Other instruments listed in the choices, such as a depth gauge, pressure gauge, and temperature probe, serve different purposes that are not directly related to analyzing the gas mixture. A depth gauge measures how deep a diver is underwater, a pressure gauge indicates the fill pressure in a cylinder, and a temperature probe measures temperature, but none of these can determine the composition of the gas within the cylinder in the way that an oxygen analyzer can.