CFPS Exam Question Example -operating principles can be used in a gas-sensing fire detector

 

 

CFPS Exam Question Example 

 Which operating principles can be used in a gas-sensing fire detector or a combination (multisensor) detector ?

A)      Semiconductor, catalytic element, or infrared absorption.

B)      Spot type, beam type, or air sampling type.

C)      Heat type, ionization type, or dual-sensor type.

D)      Optical type, thermal type, or particle type.

 

Answer: A) Semiconductor, catalytic element, or infrared absorption.

Section 14 

CHAPTER 2 ■ Automatic Fire Detectors 14-23

GAS-SENSING FIRE DETECTORS

Many changes occur in the gas content of the environment during a fire. It has been observed that detectable levels of gases are reached after detectable smoke levels and before detectable heat levels. One of three operating principles, that is, semiconductor, catalytic element, or infrared absorption, may be used in a gas-sensing fire detector or in a combination (multisensor) detector.