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Calibration
Calibration
Connect GPT Apparatus
to the Analyzer
Adjust Instrument Gain
Set NO and NO
4-10
42iQ Instruction Manual
Use the following procedure to connect the GPT apparatus to the analyzer.
1. Assemble a dynamic calibration system such as the one shown in
4–1.
2. Ensure that all flow meters are calibrated under the conditions of use
against a reliable standard, such as a soap-bubble meter or wet-test
meter. All volumetric flow rates should be corrected to 25 °C and 760
mmHg.
3. Precautions should be taken to remove O
from the NO pressure regulator and delivery system prior to the start of
calibration to avoid any conversion of NO to NO
cause significant errors in calibration. This problem can be minimized
by:
a. Carefully evacuating the regulator after the regulator has been
b. Thoroughly flushing the regulator and delivery system with NO
c. Not removing the regulator from the cylinder between calibrations
4. Connect the analyzer sample bulkhead input to the output of the GPT
system.
Use the following procedure to adjust the instrument gain. This includes:
Setting the NO and NO
●
Calibrating the NO channel to the NO calibration gas
●
Calibrating the NO
●
Background
The NO and NO
x
calibration. The background signal is the combination of electrical offsets,
to Zero
PMT dark current, and trace substances undergoing chemiluminescence.
For more detailed information, see
in the "Operation" chapter.
connected to the cylinder and before opening the cylinder valve.
after opening the cylinder valve.
unless absolutely necessary.
background to zero
x
channel to the NO
x
background corrections are determined during zero
x
and other contaminants
2
. Failure to do so can
2
calibration gas
x
"Calibrate NO and NOx
Figure
Background"
Thermo Scientific
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