Calibration
Instrument Preparation
Thermo Scientific
49iQ Instruction Manual
4-3
Use the following procedure to prepare the instrument prior to calibration.
1.
Turn the instrument ON.
2.
Allow the instrument to stabilize for a minimum of one hour.
3.
Perform the service checks in the “
Maintenance
” chapter.
4.
Connect the 49iQ to the ozone manifold. If a PTFE particulate filter is
being used, it must be installed prior to calibration.
As indicated in the EPA Technical Assistance Document there are several
tests that should be performed prior to the use of an ozone UV photometer
as a calibrator to ensure the accuracy of the measurements. These tests
include:
●
System check
●
Ozone loss test
●
Linearity check
●
Intercomparability
A step-by-step checkout procedure to verify proper operation of a 49iQ
Primary Standard (or a 49iQ modified as described earlier) is as follows:
1.
Turn the calibration photometer ON.
2.
Turn the ozonator ON.
3.
Allow the calibration photometer and ozonator to stabilize for one
hour.
4.
Perform the service checks in the “
Maintenance
” chapter.
If the calibration photometer passes the leak test in the “
Maintenance
”
chapter, it is highly unlikely that the system is destroying ozone. If desired,
a rigorous test is as follows (this check follows the EPA's Technical
Instrument
Preparation
Calibration
Photometer
System
Preparation
System Check
Ozone Loss Test
Содержание 49iQ
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