Calibrate No Low - Thermo Scientific 42iQ Instruction Manual

Calibration
Calibration in Dual Range and Auto Range Mode

Calibrate NO Low

4-18 42iQ Instruction Manual
For detailed information about the menu parameters and the icons used in
these procedures, see the "Operation" chapter.
1. Follow the "Pre-Calibration" procedure described previously in this
chapter.
2. Be sure the instrument is in the auto or dual mode. If the instrument is
not in auto or dual mode:
a. From the Home screen choose Settings>Measurement
Settings>Range Mode Selection.
b. Select Auto or Dual mode.
3. Introduce zero air to the SAMPLE bulkhead and allow the analyzer to
sample zero air until the NO, NO
4. After the responses have stabilized, from the Home Screen, choose
Calibration>Calibrate Backgrounds>Calibrate NO Background.
The Target NO Concentration button will read 0.000. The Calculated
NO Background button will display the background needed to make
the current NO concentration go to 0.000.
5. In the Calibrate Backgrounds screen, press Calibrate to set the NO
reading to zero and to save the new background.
6. Press the Back button to return to the Calibration Backgrounds screen
and repeat this procedure to set the Calibrate NO
zero.
Use the following procedure to calibrate NO channel to the NO
calibration gas.
1. Disconnect the source of zero air from the SAMPLE bulkhead. In its
place, connect a source of NO calibration gas of about 80% of the low
NO full-scale range.
2. Allow the analyzer to sample the low NO calibration gas until the NO,
NO , and NO readings stabilize.
2 x
, and NO responses stabilize.
2 x
Background to
x
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