1. JAMIE LEE YI FEI HE XUE QI TO KAR YEE CHIENG LEE EN TAN YEE HERN BUILDING SERVICES 2

2. Block E, Taylor’s University

3. 9 8 7 6 5 4 3 2 1 G LG Carpark Café & LT Labs & Workshops Classrooms Office Café & LT Moot Court

4. Photoelectric Light Scattering Smoke Detector

5.  BEFORE fire breakout, the light emitted from the light source is not detected by the photo sensor.  When smoke particles enter the chamber, some of the light is scattered toward the photo sensor.  DURING fire breakout, as the amount of smoke particles that enter the chamber keep on increasing, more incident light is scattered toward the photo sensor.  When the concentration of particles reaches a predetermined threshold, it will trigger the alarm and sends data message to the system control panel for processing.

6. Photoelectric Light Scattering Smoke Detector First 3 minutesAfter 3 minutes 1 1 2 2 3 3

7. Light Scattering Smoke Detector Ionized Smoke Detector Detection Has a light source projecting its beam into a light trap. When the smoke enters, the light will be strike by the smoke and then reflect onto the photoelectric cell & continuous generate the alarm system. Have an ionization chamber which consists of 2 electrodes/ electrical plates. When smoke enters the chamber, smoke particles attach to the ions and disrupt the flow of ions. Therefore, the decline of flow of current activates the alarm. Types of Fire it detects Smoldering fire and dense smoke. Good for fast flaming fires with less visible smoke. Sensitivity Less sensitive to steam. However, false alarm may occur due to insects or dust. Less likely to cause false alarm due to insects or dust. However, it can easily cause disturbing alarm if the installation of detectors is close to the stove. Price Slightly expensive.Slightly cheaper. Safety Does not contain any radioactive materials. It contains small amount of radioactive material.

8. LIGHT SCATTERING SMOKE DETECTOR We choose :

9. 1) It is not harmful towards human health. 2) Its detection towards smoke is much faster than ionization smoke detector. 3) It works best in an enclosed area. 4) It meets the requirement from the Fire and Rescue Department (BOMBA). Reasons :

11. Conclusion & Suggestions  We will never know what type of fire or other circumstances that may happen. Hence, we must always be careful and stay alert.  Our group suggests that the university should think about installing smoke detectors in every classroom for added safety.

12. THANK YOU 