Spectrex 40/40R - Single IR Flame Detector - Manual (Page 16)

SharpEye TM Single IR Flame Detector User Guide
4 Features and Benefits
1.3 Features and Benefits
• Single IR Channel: Between 4.4 - 4.6 microns.
• Built In Test (BIT): Manual and Automatic (see Built-In-Test (BIT) on
page 14).
• Heated Window: Prevents effects of icing, snow, condensation.
• Electrical Interface:
• Dry contact relays
• Communication network RS-485
• 0-20mA output
• HART Protocol: Communication protocol (see HART Protocol on page 5).
• EExde: Integral junction box for easy wiring.
• SIL-2: TÜV approved.
• Hazardous Area Certification: ATEX, IECEx, FM, CSA.
• EN54-10: Approved by LPCB (BRE, UK).
1.4 Principles of Operation
This section describes the 40/40R principles of operation and includes:
• Fire Detection Principles of Operation, page 4
• Heated Optics, page 5
• HART Protocol, page 5
• RS-485 Modbus, page 5
• Product Certification, page 6
1.4.1 Fire Detection Principles of Operation
The Single IR flame detector provides early warning of flaming fires
involving organic materials (hydrocarbon fuels and vapors). These fires emit
strong IR radiation in the 4.4-micron spectral band where the CO
2
(the main
combustion product of any organic substance) has a unique spectral peak.
This detector contains an advanced infrared sensor and optical filter that
provides maximum sensitivity to the CO
2
emission spectral band at 4.4
micron.
The detector is designed to withstand “harsh” environment conditions, for
example; extreme temperatures, high humidity and vibrations.