Which of the following IS NOT a combination detector?

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Multiple Choice

Which of the following IS NOT a combination detector?

A combination detector is a single device that uses two sensing methods to detect a fire, providing cross-checking and greater reliability. Infrared and ultraviolet together form a flame-detection pair in one unit, fixed temperature and rate-of-rise combine two heat-sensing criteria, and heat and smoke can be housed as a dual-sensor detector. Manual pull and automatic, however, are two separate initiation methods (a manual pull station versus an automatic detector) and are not combined into one device. So this option is not a combination detector.

A combination detector is a single device that uses two sensing methods to detect a fire, providing cross-checking and greater reliability. Infrared and ultraviolet together form a flame-detection pair in one unit, fixed temperature and rate-of-rise combine two heat-sensing criteria, and heat and smoke can be housed as a dual-sensor detector. Manual pull and automatic, however, are two separate initiation methods (a manual pull station versus an automatic detector) and are not combined into one device. So this option is not a combination detector.

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