Fire Fighting Enterprises FIRERAY 2000 User Manual

FIRERAY

FEATURES

2000

• Range 10 – 100 Metres

Optical Beam Smoke Detector

• 11.5Vdc to 28 Vdc
operating voltage

• Selectable alarm
thresholds

•

Low current
consumption

•

Ground level electronics

• Manual or automatic
reset

•

Automatic contamination
compensation

Fire Fighting Enterprises Ltd.

Approved by VdS No. : G 297058
to EN54 Part 12

Fireray 2000 Installation Guide 22318.00.R 25.08.05

System Description

The Fireray 2000 is a linear beam smoke detection system capable of protecting an open indoor area of up to
1500 square metres.

The System comprises a Transmitter which projects a modulated infrared beam over an area to a Receiver,
which then for wards a signal to a Control Unit f or analysis. T he System ca n detect smok e particles obsc uring
the beam path. When obscured for a predefined length of time the Control Unit will generate an alarm.

Smoke Detection

When smoke i s presen t in th e beam pat h the s ignal rec eived by the Recei ver is re duced rela tive to the densit y
of the smoke. If the density of the smoke reduces the signal below a preset threshold for a period of 10 seconds
an alarm relay is activated.

There are 3 selectable threshold levels available, 25%, 35%, and 50%. (25% being the most sensitive).

Auto Reset

The alarm relay is configurable and can be either latching or non-latching.
If non-latching is selected the alarm relay will reset 5 seconds after the smoke has cleared.
If latching is selected the alarm relay will remain set until either a power down reset is performed, or the

Controller Unit receives an external reset.

Automatic Gain Control

The Control Unit supports an Automatic Gain Control (AGC) circuit. Long term degradation of signal strength by
the build up of dirt on optical surfaces will not generate an alarm because of compensation provided by the
AGC circuit. This operates by comparing the received signal against a standard over a predefined time interval
which is nominally 1.5 hours, if the signal strength deviates by more than 7% over this time span the Receiver
gain is automatically adjusted to compensate.

Fault Detection

The Control Unit is capable of detecting failures within the System. In the event of a System failure being
detected the fault relay is activated.

System failures will be caused by:

• The TEST/RESET switch in the Control Unit set to the ON position

• Total loss of power or a supply reduction below the specified minimum to the Control Unit.

• The System is unable to settle during the power on AGC stabilisation period.

• The System AGC circuits have reached the limit of compensation.

• The signal has been reduced by more than 93% for approximately 10 seconds.

• The beam path is completely blocked.

A Transmitter failure.

•

• Loss of power to the Transmitter.

• A Receiver failure.

• Misalignmen t of the Transmitter and Receiver resulting in a signal loss of greater than 93%

Fireray 2000 Installation Guide 22318.00.R 25.08.05

2

Detector Positioning

Φ

Υ

It is important that the Fireray 2000 Detector is positioned correctly to minimise the detection time.
Experiments have shown that smoke from a fire does not rise directly upwards, but fans out or mushrooms due

to air currents and heat layering effects. The time to signal a fire condition depends on the location of the
Detector within the premises, the volume of smoke produced, construction of the roof, and ventilation
arrangements.

The maximum distance either side of the beam axis is found to be typically 7.5 metres for satisfactory detection
under flat ceilings.

Single Beam

Multiple Beams

0.3m ↔ 0.6m

15 m

MAX

(0.5m ↔ 7.5m)

MAX

15 m
MAX

(0.5m ↔ 7.5m)

MAX

Smoke layerin g, where smoke does not reach the ceiling l evel due to layers of static hot air is over come by
mounting the Detector at the recommended height below the ceiling of between 0.3 and 0.6 metres, bringing
the infrared beam below the heat layer and into the smoke layer.

However in all i nstallations the national fi re standards for that particu lar country mus t be consulted. If there is
any doubt on the correct mounting height, positioning may be determined by smoke tests.

Detector Positioning In Apex Of Sloping Ceiling

A ceiling is defined as sloping if the distance from the top of the apex to the intersection of the ceiling and
adjacent wall is greater than 0.6 metres (See fig. 1).

Υ

Χ

Slope if Χ ≥ 0.6 Metres

= Pitch angle

=

+

Fig 1 Fig 2

When a Detect or is posit ioned in the apex of a ceiling (See f ig. 2). The lat eral beam dist ance covered (Υ) can
be increased in relation to the angle of pitch (Φ).

For Example:
If the pitch angle is 20 degrees the lateral coverage can be increased from 7.5 metres either side of the beam

(Υ) to:

Υ = 7.5 + (7.5 x 20/100) metres
Υ = 9 metres

Therefore with a roof pitch of 20 degrees the lateral coverage can be increased from 7.5 metres either side of
the beam to 9 metres either side of the beam, but only for the beam positioned in the apex. All other
calculations remain the same.

This formula can be applied to pitch angles up to and including 25 degrees. Therefore the maximum increase in
lateral coverage can be:

Υ = 7.5 + (7.5 x 25/100) metres
Υ = 9.375 metres

Pitch angles over 25 degrees must use the maximum lateral figure of 9.375 metres either side of the beam.

Fireray 2000 Installation Guide 22318.00.R 25.08.05

3