A bimetallic heat detector is an example of which type of detector?

A bimetallic heat detector is an example of which type of detector?

• A. Spot-type detector
• B. Rate-of-rise detector
• C. Fixed-temperature detector
• D. Ionization detector

Answer: (A)

A bimetallic heat detector relies on a small sensing element at a single location—the bimetal strip—that bends when heated and closes or opens a circuit at a set temperature. This local, point-by-point sensing character makes it a spot-type detector. It’s installed at fixed locations to monitor temperature at that spot, rather than sensing heat along a length or detecting smoke. The ionization option is for smoke detectors, and a rate-of-rise device would focus on how fast the temperature is increasing rather than the absolute temperature at a fixed point, which is not the primary function of this device.

A bimetallic heat detector relies on a small sensing element at a single location—the bimetal strip—that bends when heated and closes or opens a circuit at a set temperature. This local, point-by-point sensing character makes it a spot-type detector. It’s installed at fixed locations to monitor temperature at that spot, rather than sensing heat along a length or detecting smoke. The ionization option is for smoke detectors, and a rate-of-rise device would focus on how fast the temperature is increasing rather than the absolute temperature at a fixed point, which is not the primary function of this device.