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3. Monitor the zero air reading and wait for the reading to stabilize.
4. From the Home Screen, choose Calibration>Calibrate Background.
The Target Concentration button will read 0.000. The Calculated
Background button will display the background needed to make the
current SO
concentration go to zero.
2
5. Press Calibrate to set the SO
background.
6. Connect a source of calibration gas to the SAMPLE bulkhead. The
calibration gas concentration should be approximately 80% of the high
full-scale range.
7. 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.
8. Sample the vented calibration gas and wait for the instrument reading
to stabilize.
9. From the Home Screen, choose Calibration>Calibrate High Range
Span Coefficient.
The user sets the span concentration by pressing the Edit High Range
Span Concentration button. The Calculated High Span Coefficient
button will show what the high range span coefficient will be set to if
the Calibrate button is pressed. Pressing the Calibrate button will save
the new high range coefficient and calibrate the instrument.
10. Enter the SO
calibration gas concentration using the pushbuttons, and
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then press Calibrate to calibrate the instrument to the high SO
calibration gas.
Note The minimum and maximum analog output configuration values
should be set to the default settings (minimum 0%; maximum 100%).
11. Connect a source of calibration gas to the SAMPLE bulkhead. The
calibration gas concentration should be approximately 80% of the low
full-scale range.
Calibration in Dual/Auto Range Mode
reading to zero and to save the new
2
Calibration
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L
4-9
43iQ Instruction Manual
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