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Calibration
Zero/Span Check
Zero/Span Check
4-10
Model 43i Trace Level-Enhanced Instruction Manual
15. Plot a graph of instrument readings against the SO
generated for the high range.
16. Connect a source of calibration gas to the SAMPLE bulkhead. The
calibration gas should be approximately 80% of the low full-scale
range.
17. Use
to move the cursor to Calibrate LO SO
display the Calibrate LO SO
The first line of the display shows the current SO
line of the display is where you enter the low calibration gas
concentration.
18. To enter the low calibration gas concentration, use
move the cursor left and right. Use
decrement the digit. Press
SO
calibration gas.
2
The display flashes the message "SAVING", and the corrected SO
reading is displayed.
19. Press
to return to the Calibration menu.
20. Generate five SO
2
concentration above.
21. Record instrument reading for each concentration after allowing time
for both gas generation system and instrument to stabilize.
22. Plot a graph of instrument readings against the SO
generated for the low range.
This is the instrument calibration curve. All future measurements
should be interpreted using this curve.
The zero/span check procedure is normally performed any time a quick
check of the accuracy of the instrument is required. Normally, zero and
span are checked daily. As experience is gained with the instrument, the
frequency of these checks can be adjusted accordingly.
The span gas concentration used in the span check should be between 70%
and 90% of the full-scale range. The zero and span drift should be
measured and recorded prior to making any adjustments.
screen.
2
to calibrate the instrument to the low
concentrations equally spaced between zero and the
concentrations
2
, and press
to
2
reading. The second
2
to
to increment and
2
concentrations
2
Thermo Fisher Scientific
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Troubleshooting
