JAMIE LEE YI FEIHE XUE QI

TO KAR YEECHIENG LEE ENTAN YEE HERN

BUILDING SERVICES 2

Block E, Taylor’s University

987654321GLG Carpar

k

Café & LTLabs &

Workshops

Classrooms

Office

Moot Court

Photoelectric Light ScatteringSmoke Detector

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.

Photoelectric Light ScatteringSmoke Detector

First 3 minutes After 3 minutes

1 2

3

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.

LIGHT SCATTERING SMOKE DETECTOR

We choose :

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 :

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.

THANK YOU A