Smoke Detectors & Placement

Ionization Detector

There are two major types of smoke detectors. The first is an ionization detector that contains a small amount of radioactive material. This material sends a small electrical current to an electrode across a gap. When smoke enters the gap between these electrodes it causes a disturbance in the current flow. This disturbance causes the detector to go into alarm.

Photoelectric Detector

The second type of smoke detector is a photoelectric detector. This type has a beam of light emitted inside the detector and a photocell. When smoke enters this detector, the beam of light is deflected and this deflection is detected by the photocell causing the alarm to sound.


We recommend having a detector in each sleeping area and the hallway that leads from these rooms to an exit and on each floor or level in the home. Smoke detectors also go into alarm at different times so having many and different types of detectors will give you the best chance of an early warning.

For more information on fire prevention in Navasota, please contact Fire Chief/EMC, Jason Katkoski at (936) 825-7388.