Spectrex Quasar 900 Open-Path Gas Detection System - Manual (Page 7)

Table of Contents vii
Table of Contents
Quasar 900 Open-Path Gas Detection System
User's and Maintenance Manual ....................................................................... i
Legal Notice .................................................................................................... iii
Release History ............................................................................................... iv
About this Guide .............................................................................................. v
Abbreviations and Acronyms ............................................................................. vi
1 Scope ......................................................................................................... 1
1.1 Product Overview ................................................................................... 1
2 Technical Description ................................................................................ 3
2.1 Features ............................................................................................... 3
2.2 Applications ........................................................................................... 4
2.3 Principle of Operation ............................................................................. 4
2.3.1 Definitions of Terms ......................................................................... 4
2.3.2 Spectral Finger Print ......................................................................... 4
2.3.3 Optical Path .................................................................................... 5
2.3.4 Microprocessor Based ....................................................................... 5
2.3.5 Gas Sensitivity ................................................................................ 5
2.3.6 Gas Calibration ................................................................................ 5
2.3.7 Flash Source ................................................................................... 5
2.3.8 Heated Optics .................................................................................. 6
2.3.9 HART Protocol ................................................................................. 6
2.3.10 Handheld Unit ................................................................................. 6
2.3.11 Modbus RS-485 ............................................................................... 7
2.3.12 Tilt Mount ....................................................................................... 7
2.4 Product Certification ............................................................................... 7
2.4.1 ATEX, IECEx .................................................................................... 7
2.4.2 FM / FMC ........................................................................................ 8
2.4.3 SIL-2 .............................................................................................. 8
2.4.4 Functional Test ................................................................................ 8
2.5 Models and Types .................................................................................. 8
2.6 Description ............................................................................................ 9
2.6.1 Flash Source Unit ............................................................................ 10
2.6.2 Detector Unit .................................................................................. 11