Fas_presentation.pptx

Fire Alarm System Overview Detects fire in early stage and alert personnel by audiovisual alarm. Consists of Control Panel and Various Types of Sensors  Ionisation smoke detectors  Optical Smoke Detectors  Heat Detectors  Manual Call Points  Intrinsically Safe Detectors

Typical Loop Wiring Ionisation Smoke Detector

Manual Call Point

Heat Detector

Isolator

Protocol translator Optical Smoke Detector

Control Panel

230V AC

Zener Barrier

Intrinsically safe Ionisation Smoke Detector

Remote Hooter

Ionisation Smoke Detector LED LED

Address Card

Base

Ionisation Smoke Detector

Ionisation Smoke Detector Detector Status Indication RED LED “OFF”---Normal Condition RED LED “ON”---Alarm Condition Individual Addresses: Up to 126 Address Setting: Through punching Expert Cards Operating Voltage: 17-28V DC Approval: ABS Sensing Element: Twin compensating chambers using one single sided Ionising radiation source, Americium 241.

Principle of Operation •The Detector is designed to be connected to a two wire loop circuit carrying both data and a 17V to 28V dc supply. •When Smoke enters the ionisation chamber, the voltage at the sensing electrode increases to produce an analog signal. An A/D conversion of the signal from the ionisation chamber is carried out once per second. when the device is interrogated, this data is sent to the control panel. •The detector is calibrated to give an analog value of 25±7counts in clean air.This value increases with smoke density.A count of 55 corresponds to alarm level. Count levels between 45 and 55 provides pre alarm.

Optical Smoke Detector LED LED Address Card

Base

Optical Smoke Detector

Optical Smoke Detector Detector Status Indication Clear LED “OFF”---Normal Condition Clear LED “Glow Red”--Alarm Condition Individual Addresses: Up to 126

Address Setting: Through punching Expert Cards Operating Voltage: 17-28V DC Approval: ABS Sensing Element: Silicon PIN Photo Diode Emitter: GaAs Infra-red LED Detection Principle: Photo Electric detection of light scattered in a forward direction by smoke particles.

Principle of Operation •An infra red LED within it’s collimator is arranged at an obtuse angle to the photo diode. The photo diode has an integral day light blocking filter. •The IR LED emits a burst of collimated light every second. In clear air, photo diode receives no light from the IR LED because of the angular Arrangement and the dual mask. •When smoke enters the chamber, it scatters photons from the emitter IR LED on to photo diode. The photo diode signal is processed and Passed to A/D converter and sent to control panel when interrogated.

Heat Detector LED

Address Card

Base

Heat Detector Detector Status Indication

RED LED “OFF”---Normal Condition RED LED “Glow Red”--Alarm Condition

Individual Addresses: Up to 126 Address Setting: Through punching Expert Cards

Operating Voltage: 17-28V DC Approval: ABS Sensing Element: Single NTC Thermistor

Principle of Operation •The Heat detectors monitor temperature by using a single thermistor network which provides a voltage output proportional to the external Air temperature. This voltage output is processed in the A/D converter And is transmitted to the control panel when interrogated.

•Control panel continuously polls the detectors @ 32 devices/sec.

Manual Call Point Status Indication

RED LED “OFF”---Normal Condition RED LED “Glow Red”--Alarm Condition Individual Addresses: Up to 126 Address Setting: Through DIL Switch Operating Voltage: 17-28V DC Approval: ABS Sensing Element: Switch

Principle of Operation •The address of each call point is set by means of seven segment DIL switch

•When glass is broken, alarm is initiated by the control panel.

Intrinsically Safe Ionisation Smoke Detector

IS Detectors operate at low power and with small amounts of stored energy that it is incapable of causing ignition. So they are used in hazardous areas.

Intrinsically Safe Ionisation Smoke Detector Detector Status Indication RED LED “OFF”---Normal Condition RED LED “Glow Red”--Alarm Condition Individual Addresses: Up to 126 Address Setting: Through punching Expert Cards Operating Voltage: 14-22V DC Approval: ABS, BASEFA Sensing Element: Twin compensating chambers using one single sided Ionising radiation source, Americium 241.

Principle of Operation

Protocol Translator

•It translates the loop voltage (17-28V DC) to 14 – 22V DC. •Reduces the amplitude of the current pulses From 20mA to 10mA compatible to IS Detectors Approval: ABS, BASEFA

Zener Barrier

The zener barrier is also responsible for the current limitation. It has series resistance. Approval: ABS, BASEFA

FIRE ALARM CONTROL PANEL- 4 LOOP

FIRE ALARM CONTROL PANEL WIRING SIDE VIEW

Product Overview Available with 2 or 4 detection circuits, each capable of hosting up to 126 devices (Apollo), Syncro uses the most advanced microprocessor technology to provide a control system of extremely high integrity. Syncro can be configured to suit all types of system, from the most simple, to the highly complex. Its fully integrated and secure network provides an intelligent interface for building control. A large area graphic display ensures that information is presented in plain language with detailed extra help available by pressing a ‘help’ button. Config. Features 2 or 4 loop versions as standard (for 6 - 8 loop versions see DS57 page 12-13) Larger enclosure available (fits 24A/H SLAs) Network up to 64 panels/repeaters 4 programmable sounder circuits as standard 5.25 amp power supply to EN54 part 4 Large graphic display In built help and alarm information screens Certified to EN54-2/ EN54-4 Real time clock loop powered sounders and beacons 2 programmable function buttons 3 programmable front panel mounted LED’s Simple Windows® graphical configuration utility