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Blowback ......................................................................................... 7-5
Instrument Background Scan and Flowback .................................... 7-5
Check Zero ...................................................................................... 7-6
Check Spike ..................................................................................... 7-6
Check Span...................................................................................... 7-6
FTIR................................................................................................... 7-7
Optical Components........................................................................ 7-9
Source .............................................................................................. 7-9
Interferometer ................................................................................ 7-10
Laser .............................................................................................. 7-10
Mirrors........................................................................................... 7-10
Aperture......................................................................................... 7-10
Detector......................................................................................... 7-11
Gas Cell ......................................................................................... 7-11
Gas Cell Heating Jacket ................................................................. 7-11
Temperature Sensor ....................................................................... 7-12
Pressure Sensor............................................................................... 7-12
Gas Cell Interface........................................................................... 7-12
Computer Interface........................................................................ 7-12
Humidity Control.......................................................................... 7-12
Air Purifier ........................................................................................ 7-12
Industrial PC..................................................................................... 7-13
I/O Boards ..................................................................................... 7-14
Console............................................................................................. 7-14
Datalogger......................................................................................... 7-14
Electrical Panel Assembly .................................................................. 7-14
AC Power Input................................................................................ 7-15
Serial Communication Parameters ......................................................B-2
TCP Communication Parameters .......................................................B-2
Application Data Unit Definition .......................................................B-2
Slave Address....................................................................................B-2
MBAP Header .................................................................................B-2
Function Code .................................................................................B-3
Data .................................................................................................B-3
Error Check .....................................................................................B-3
Function Codes...................................................................................B-3
(0x03) Read Holding Registers.........................................................B-3
Modbus Parameters Supported ...........................................................B-5
Introduction....................................................................................... C-1
Omni FTIR Multi Gas CEMS Instruction Manual
Contents
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