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Calibration
Multi-Point Calibration
4-6
Model 43i Trace Level-Enhanced Instruction Manual
0.5 LPM. Actual zero air flow should be 0.8 LPM or more, with the
excess flowing out the atmospheric bypass.
a. From the Run screen, press
b. From the Main Menu, choose Diagnostics > Flow to display the
Sample Flow screen.
c. Make sure that the reported sample flow is less than the actual zero
air flow.
3. Monitor the zero air reading and wait for the reading to stabilize.
4. From the Main Menu, choose Calibration to display the Calibration
menu.
5. At the Calibration menu, press
screen, after 10 minutes of zero air and when the reading is stable, press
to set the SO
The display flashes the message "SAVING", and the SO
added to the background correction. Record the stable zero air reading
as Z
.
SO2
6. Press
to return to the Calibration menu.
7. Connect a source of calibration gas to the SAMPLE bulkhead. The
calibration gas concentration should be approximately 80% of the full-
scale range.
8. To ensure that the calibration gas is being measured at atmospheric
pressure, check that the sample flow in the analyzer is approximately
0.5 LPM. Actual sample air flow should be 0.8 LPM or more, with the
excess flowing out the atmospheric bypass.
9. Sample the vented calibration gas and wait for the instrument reading
to stabilize.
10. Press
to move the cursor to Cal SO
to display the Calibrate SO
The first line of the display shows the current SO
CONC line of the display is where you enter the calibration gas
concentration.
to display the Main Menu.
to display the SO
reading to zero.
2
2
screen.
2
Background
2
reading is
2
Coefficient, and press
reading. The SPAN
2
Thermo Fisher Scientific
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Troubleshooting
