Thermo Scientific Omni FTIR Multi Gas CEMS, Инструкция по эксплуатации

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Thermo Fisher Scientific Omni FTIR Multi Gas CEMS Instruction Manual 4-1
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 Collection ” on page 4-
1
●
“ Periodic System Zero Check ” on page 4-2
●
“ Periodic System Span Check ” on page 4-3
●
“ System Dynamic Spiking ” on page 4-3
●
“ External Audit Gas Procedure ” on page 4-3
●
“ Calibration Gases ” on page 4-4
●
“ Manual Background Spectrum Collection Procedure ” on page 4-5
●
“ Manual Background Spectrum Collection using Thermo Modbus
Controller ” on page 4-10
●
“ System Calibration Procedure Using IMACC Collect ” on page 4-11
●
“ 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
Automatic FTIR
Instrument Zero
Background
Collection