Which type of fire alarm system sensor is intended to detect fire at its earliest stage?

The correct answer is A. Ionization. Ionization is a type of fire alarm system sensor that is intended to detect fire at its earliest stage. Ionization sensors use a small amount of radioactive material to ionize the air inside a chamber. When smoke enters the chamber, it disrupts the ionization process and reduces

Submitted by katya_ua· Mar 5, 2026Asset Security

Question

Options

AIonization
BInfrared
CThermal
DPhotoelectric

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(60 responses)

A
93% (56)
B
2% (1)
C
3% (2)
D
2% (1)

Explanation

Ionization is a type of fire alarm system sensor that is intended to detect fire at its earliest stage. Ionization sensors use a small amount of radioactive material to ionize the air inside a chamber. When smoke enters the chamber, it disrupts the ionization process and reduces the current flow, which triggers the alarm. Ionization sensors are more sensitive to small particles of smoke, such as those produced by flaming fires, than other types of sensors, such as photoelectric or thermal

Topics

#fire detection#physical security#ionization sensor#early warning systems

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