What is the difference between a smoke detector and a heat detector?

A smoke detector responds to the presence of smoke particles in the air, which typically occurs during the early stages of a fire when materials begin to burn. It is designed to detect smoke through various mechanisms, such as photoelectric sensors or ionization processes, making it effective in alerting occupants before flames develop significantly.

On the other hand, a heat detector activates upon detecting a rise in temperature, typically reaching a predetermined threshold. This type of detector is designed to monitor for high temperatures that can indicate a fire, but it does not necessarily intercept the initial stages of combustion, especially if there is no significant smoke produced.

The distinction is further evident in their applications; smoke detectors are generally recommended for areas where potential fire hazards can produce smoke quickly, whereas heat detectors are often used in environments where smoke could be present from non-fire sources, such as kitchens, or in environments that might otherwise cause false alarms with smoke detectors.

This fundamental difference underscores why the correct choice accurately states the basic operational principles of these two types of detectors.