Apollo 65 Series Panduan Instalasi - Halaman 3

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Functional Testing

Testing the operation of the detector can be achieved in two ways, provided it is safe to do

so:

• A real ﬂ ame from a portable ﬂ ickering yellow bunsen ﬂ ame or cigarette lighter

• A portable ﬂ ame detector tester unit.

Maintenance Guide

The ﬂ ame detector is designed to give years of trouble-free operation with minimal atten-

tion. However the periodic maintenance steps listed below are essential to maintain reli-

able ﬁ re protection.

1. Inform all appropriate personnel of intention to work on the ﬂ ame detector.

2. Disable any automatic systems that may be activated by the ﬂ ame detector if not

required as part of the maintenance check.

Alarms

Audio/Visual

Auto dialers

3. Check that the ﬂ ame detector's control panel is functioning correctly and shows no

faults.

4. Inspect the detector viewing window for any build-up of dust or other contaminants

on the optical surface. If necessary clean the optical surface with a cotton wipe wet

with commercial liquid glass cleaner, but not polishes. Rinse with clean water and dry

with a clean cloth.

The detector speciﬁ cation for performance is with a clean optical sensor window.

Contaminants like dust, oil and paint will reduce sensitivity.

5. Ensure the detector still has a clear line of sight of the area it is protecting and no

obstacles obstruct its view.

6. Check that the detector is securely ﬁ tted.

7. Visually check the exterior of the detector for any mechanical or corrosive damage.

8. Test the operation of the detector with either a portable ﬂ ame sensor test unit or if

practical a ﬂ ame.

9. Reinstate any automatic system disabled during maintenance.

Extinguishers

Control

Gas systems

Plant stops

Water sprays

Dampers/doors

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Quantities required and positioning of detectors

The number of detectors required and their positioning depends on:

• the anticipated size of the ﬂ ame

• the distance of the ﬂ ame from the detector and

• the angle of view of the ﬂ ame detector

The ﬂ ame detector is designed to operate to Class 1 performance as deﬁ ned in EN54-10.

The detector will, therefore, detect a ﬂ ame of approximately 0.1m² or a clear ﬂ ame of

0.25m² at 25m.

In fact, the ﬂ ame detector will detect ﬁ res at distances of up to 40m, but the ﬂ ame size at

such distances needs to be proportionally greater in order to be sure of reliable detection.

Thus the ﬂ ame that can be detected at 25m, provided that its size is not less than 0.1m², will

have to be 0.4m² in order to be detected at 40m. In a rectangular room the distance from

the ﬂ ame detector to the ﬁ re is calculated by the formula:

In the example shown in Fig 1 the room in which the ﬂ ame detector is to be installed meas-

ures 20m x 10m x 5m; the distance from the detector to the ﬂ ame will therefore be:

Fig 1 Calculation of distance from detector to ﬂ ame

The ﬂ ame detector should be positioned at the perimeter of the room, pointing directly

at the area of the anticipated ﬂ ame or at the centre of the area to be protected. If the

detector cannot 'see' the whole of the area to be protected, one or more additional

detectors may be required.

The ﬂ ame detector is not affected by most normal indoor light sources but should be posi-

tioned so that daylight is not in view.

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L² + W² + H²

20² + 10² + 5²

Height

Width

Length