Spectrex 20/20SI Triple IR (IR3) Flame Detector Bedienungsanleitung PDF herunterladen (Seite 10)

Spectrex Inc. - SharpEye

IR3 Flame Detector Manual – TM 20/20I, Rev. (6) August 2004

2. Technical Description

•

Detection Range: up to 200 ft (60m) for a 1ft x 1ft (0.3m x 0.3m) fire.

• Ultra High Immunity to False Alarms (see section. 3.3).

• Advanced Digital Processing of the Dynamic Characteristics of Fire:

Flickering, Threshold correlation and Ratio.

• Three Separate IR Channels: Between 3-5 microns.

•

Field Programmable Sensitivity: four ranges.

•

Two Response Levels: Warning & Detection.

• Solar Blind

•

Microprocessor Based

: Digital signal processing.

•

Built In Test: Manual and Automatic (see section. 4.2.2).

• Electrical Interface:

o Dry contact RELAYS.

Communication network RS-485.

4-20mA output.

• Certification: Approved by F.M, CSA, ATEX.

2.1 Principles Of Operation

2.1.1 Hydrocarbon fire detection

The triple IR flame detector detects all conceivable types of hydrocarbon fires, i.e.

any fire, which emits CO

2.1.2 Identifying the CO

peak

The hydrocarbon fire is characterized by a typical radiation emission. The CO

peak emits intense radiation in the spectral band between 4.2 µ - 4.5 µ and

weaker radiation intensity outside this spectral band.

2.1.3 The limitations of IR-IR flame detectors

in the atmosphere attenuates the radiation in this spectral band. (Absorption

and emission of radiation always occur in the same band.) As a result, the greater

the distance between the detector and the fire, the weaker the intensity of the

radiation reaching the detector (the CO

attenuation increases). This phenomenon

explains the limitations of the existing IR-IR flame detectors in the market:

• Detection distance is restricted to 33ft (10m) only.

•

Their immunity to false alarm sources is limited.

2.1.4 The advantages of IR3 technology

To overcome these limitations, Spectrex Inc. revised an innovative concept of

utilizing an additional detection channel. Three channels collect more data from

the environment, permitting more accurate analysis and better performance.

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