Spectrex Xenon 700 SIL Open-Path Gas Detection System - Manual (Page 16)

SafEye TM Xenon 700S SIL Gas Detector
4 Principle of Operation
2.2 Applications
The SafEye Xenon system may be used to monitor flammable gas
concentration in various applications, such as:
 Petrochemical, pharmaceutical and other chemical storage and
production areas
 Flammable and toxic chemical storage sites and hazardous waste
disposal areas
 Refineries, oil platforms, pipelines, refueling stations and fuel storage
facilities
 Hazardous loading docks, transportation depots and shipping
warehouses
 Engine rooms
 Compressor and pumping stations
 Test cells
 LNG-LPG Systems
 Offshore Floating Production Storage and Shipping vessels (FPSO), and
fixed oil rigs
2.3 Principle of Operation
The SafEye system detects gases through a dual spectral range monitoring,
analyzing the absorption of radiation caused by gases in the atmosphere
and comparing it (ratio) to background atmospheric absorption.
2.3.1 Definitions of Terms
Table 1 defines gas concentrations measurement terms that are used in this
manual.
Table 1: Gas Concentrations Measurement Terms
Term Description
LEL Lower Explosive Limit: The minimum concentration of a
substance (gas/vapor) in air mixture that can be ignited.
This mixture is different for every gas/vapor, measured in
% of LEL.
LEL.m Integral of Concentration in LEL units (1 LEL = 100% LEL)
and the operation distance in meters (m).