Final answer:
The Draeger Multi-Gas Detector is equipped with various sensors, not valves, to detect gases. The number of sensors depends on the model, but typically includes ones for combustible gases, oxygen, and toxic gases like carbon monoxide and hydrogen sulfide.
Step-by-step explanation:
The Draeger Multi-Gas Detector does not have valves in the way that mechanical systems do, as 'valves' might imply. Instead, these devices are equipped with sensors that detect various types of gases. The number and type of sensors vary depending on the model of the multi-gas detector. Typically, a basic Draeger Multi-Gas Detector would have sensors to detect combustible gases, oxygen depletion, and a couple of toxic gases like carbon monoxide and hydrogen sulfide. Variations in model specifications and sensor configurations exist, so it's crucial to refer to the specific product manual for accurate information regarding the number of sensors and their capabilities.