1. THE LINEAR BARRIER SAFE EYE The gas linear detection

2. DEFINITION
SAFE EYE is a continued and integrated detection system in order to measure gas concentration on an imaginary line that links 2 points:
-the transmitter on the one hand
-the receptor on the other hand
Theory based on the BEER-LAMBERT Law:
Ln I/Io=  c l

3. SENSITIVITY example IR BAND: UV BAND:
Scale: 0 to 2 LEL for paraffins CxHy (1< x<8)
Example: 0,04% vol C3H8 over 100 m or 0,44% vol over 10 m; 4,4% vol over 1 m.
UV BAND:
For aromatics and H2S including the benzene, the xylene,the toluene, ammonia
Scale: 100 to 800 ppm.m according to the type of gas

4. THE EMITTER
Flame-proof housing with emitted UV and IR sources following a discharge from an electric arc in a gas tube 5 to 60 times per minute.
Controlled flashing pulsations frequency (identification of parasitic rays )

5. THE RECEPTOR Flame-proof casing with 2 detectors:
 IR in the band 3 to 3,5 µm (paraffins)
 UV in the band 0,2 to 0,3 µm (aromatics)
2 averaged signals of analysis and of reference
OUTPUT: 4-20 mA, 2 relays, 1 bus RS 485

6. CHARACTERISTICS  Zero and sensitivity drifting automatic compensation
 High sensitivity
 Long range
 Rapid response time
 Important immunity to false alarms (sun, reflections)
 Easy digital communication
 Integrated automatic test
 High resistance to hostile environments. Protectors.
 Anti-dust screen with air flow protection ( in option)
 Heating of optics
 Supports 70 % of opacity
 Zero and sensitivity drifting automatic compensation

7. PROTECTORS

8. ALIGNMENT SYSTEM