Thermo Scientific 42i Instruction Manual page 142

Calibration
Calibration
Adjust Instrument Gain
Set NO and NO
4-10 Model 42i Instruction Manual
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
to Zero calibration. The background signal is the combination of electrical offsets,
PMT dark current, and trace substances undergoing chemiluminescence.
For more detailed information, see
in the "Operation" chapter.
Use the following procedure to set the NO background. Both the NO and
NO background screens operate the same way, therefore, the following
x
procedure also applies to the NO
Note The NO channel should be calibrated first and then calibrate the
NO channel.
x
For detailed information about the menu parameters and the icons used in
these procedures, see the "Operation" chapter.
1. Determine the GPT flow conditions required to meet the dynamic
parameter specifications as indicated in "Dynamic Parameter
Specifications for Gas Titrator" earlier in this 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
background screen.
x
Backgrounds"
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