What device uses a photoelectric cell and is also known as the visible products of combustion detector?

The photoelectric smoke detector is designed to identify smoke particles by utilizing a photoelectric cell. This type of detector works on the principle of light scattering; when smoke enters the detection chamber, it scatters the light beam emitted by the photoelectric cell. The scattering of light triggers the alarm, identifying the visible products of combustion that smoke represents.

This method is particularly effective for detecting smoldering fires, which produce larger smoke particles that can obscure the light path, making photoelectric detectors essential in environments where these types of fires are a risk. In contrast, other devices mentioned do not focus on detecting smoke specifically. For instance, ionization smoke detectors use a different principle involving ionized air, while flame detectors specifically sense infrared or ultraviolet radiation from flames. Gas detectors identify combustible or toxic gases, which are unrelated to the smoke detection function addressed in this question. Therefore, the photoelectric smoke detector stands out as the correct answer due to its direct association with the detection of visible smoke from combustion.