Thermo Scientific 42iQLS, Instruction Manual

Page: 41 / 318

Operation
Calibration
Thermo Scientific 42iQLS Instruction Manual 3-15
The Calibrate NO, NO
2
, and NO
x
Span Coefficient screens are used to
enter span concentrations and calibrate the NO, NO
2
, and NO
x
coefficients. The NO span coefficient is calculated, stored, and used to
correct the current reading. All calibration screens function the same way.
Therefore, the following example of the NO screen applies to the NO
2
and
NO
x
calibration screens as well.
The following screens are shown in single range mode and dual or auto
range mode. In dual or auto range modes, “High” or “Low” is displayed to
indicate the calibration of the high or low coefficient. The Calibrate High
Span Coefficient and Calibrate Low Span Coefficient screens function the
same way.
It is important to note the averaging time when calibrating. The longer the
averaging time the more precise the calibration results. To achieve
maximum precision, allow the instrument to stabilize each time input gas is
changed and set the averaging time to 300-second averaging.
Home Screen>Calibration>Calibrate Span Coefficient (single range
mode)
Calibrate NO, NO
2
, and
NO
x
Span Coefficient