Calibration
Pre-Calibration
4-8
Model 42
i
Trace Level Instruction Manual
Thermo Fisher Scientific
Perform the following pre-calibration procedure before calibrating the
Model 42
i
Trace Level. For detailed information about the menu
parameters and the icons used in these procedures, see the “Operation”
chapter.
Note
The calibration and calibration check duration times should be long
enough to account for the transition (purge) process when switching from
sample to zero and from zero to span. This transition time is the time
required to purge the existing air.
▲
Depending on the plumbing configuration and the instrument, data from
approximately the first minute of a zero calibration or check should be
disregarded because of residual sample air. Also, data from approximately
the first minute of a span calibration or check should be disregarded
because the span is mixing with the residual zero air.
▲
1.
Allow the instrument to warm up and stabilize.
2.
Be sure the ozonator is ON. If the ozonator is not ON:
a.
Press
to display the Main Menu, then choose Instrument
Controls >
Ozonator
.
b.
Press
to toggle the ozonator ON.
c.
Press
to return to the Run screen.
3.
Be sure the instrument is in the auto mode, that is, NO, NO
2
, and
NO
x
measurements are being displayed on the front panel display. If
the instrument is not in auto mode:
a.
Press
to display the Main Menu, then choose Instrument
Controls >
Auto/Manual Mode
.
b.
Select
NO/NO
x
, and press
.
c.
Press
to return to the Run screen.
4.
Select NO, NO
2
, and NO
x
ranges, and push the AVG soft key to
display the Averaging Time screen. It is recommended that a higher
averaging time be used for best results. For more information about the
ranges or averaging time, see the “
Operation
” chapter.
Pre-Calibration
