Calibration
Calibration in Dual/Auto Range Mode
4-8
43iQHL Instruction Manual
Thermo Scientific
0.7 LPM. Actual zero air flow should be 0.8 LPM or more, with the
excess flowing out the atmospheric bypass.
a.
From the Home screen choose
Settings>Health Check>Status
and Alarms>Flow and Pressure
.
b.
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 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
2
concentration go to zero.
5.
Press
Calibrate
to set the SO
2
reading to zero and to save the new
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
0.9 LPM.
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
2
calibration gas concentration using the pushbuttons, and
then press
Calibrate
to calibrate the instrument to the high SO
2
calibration gas.
Summary of Contents for 43iQHL
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