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Automatic FTIR
Instrument Zero
Background
Collection
Thermo Fisher Scientific
Chapter 4
Calibration
The Calibration procedure is in accordance with EPA method 320, 321,
PS15. FTIR instrument zero, system zero check, system span and system
dynamic spiking are described in this chapter. The user can also perform
manual instrument background collection, and manual system calibration.
System zero check, span check and dynamic spiking are set to be controlled
by the operator via Thermo Modbus Controller or a data logger and PLC.
The user interface for the PLC is currently under development.
For details, see the following topics:
"Automatic FTIR Instrument Zero Background
●
1
"Periodic System Zero
●
"Periodic System Span
●
"System Dynamic
●
"External Audit Gas
●
"Calibration
Gases" on page
●
"Manual Background Spectrum Collection
●
"Manual Background Spectrum Collection using Thermo Modbus
●
Controller" on page
"System Calibration Procedure Using IMACC
●
"System Calibration Procedure Using Calibration Factor Table in
●
Method" on page
4-18
In normal operation mode, FTIR instrument zero is part of the system auto
operation procedure. It is scheduled to be performed once every day.
Instrument zero spectrum collection begins at 3:15 am. The sample control
valve is first shut off, followed by triggering the instrument zero valve to
flow zero air into the optical gas cell. After purging the optical gas cell for
~10 minutes, a new background spectrum is collected and compared with
the previous one. A good newly acquired background spectrum is saved for
subsequent sample spectrum processing. If the new zero background
Check" on page
4-2
Check" on page
4-3
Spiking" on page
4-3
Procedure" on page
4-3
4-4
4-10
Omni FTIR Multi Gas CEMS Instruction Manual
Collection" on page
Procedure" on page
4-5
Collect" on page
4-11
4-
4-1
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