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Calibration
Calibration
Thermo Scientific
42iQD Instruction Manual
4-13
3.
Record the NO
x
responses.
4.
Plot the analyzer responses versus the respective calculated NO
x
concentrations and draw or calculate the respective calibration curves.
For subsequent calibrations where linearity can be assumed, these
curves may be checked with a three-point calibration consisting of a
zero point, NO and NO
x
concentrations of approximately 80% of the
URL, and an intermediate concentration.
Note
The user can also manually change the calibration factors. This is
often useful in a troubleshooting situation. From the Home screen, choose
Calibration>Advanced Calibration>Manual Calibration>
Adjust Span
Coefficients
.
However, after the above calibration procedure is completed, all subsequent
data reduction depends on the calibration parameters remaining the same
as during the initial calibration. Therefore, never change any calibration
factor without first recording the value so that after any troubleshooting
procedure is completed, the initial value can be re-entered thereby not
altering the multipoint calibration.
▲
Although it is recommended that a GPT system be used to calibrate the
analyzer, the procedure described in the Code of Federal Regulations, Title
40, Part 50, Appendix F using a NO
2
permeation tube may be used as an
alternative procedure for calibrating the instrument.
Commercial precision dilution systems are available which reliably and
accurately dilute a high concentration gas mixture to provide a reliable span
gas. A high concentration of NO
2
in air is precisely diluted to the
concentration range required.
The Thermo Scientific 146iQ Multi-gas Calibrator is one such system for
precision dilution.
Permeation tube systems which precisely maintain a set temperature to
within ±0.1
°
C and hold a zero air flow rate to within ±0.5% can be used
for generation of span gas. The flow rate of the permeation system must be
at least 0.5 LPM for proper operation.
A permeation tube system, shown in
can be constructed. All
connections between components in the system should be made with glass,
PTFE, or other non-reactive material.
Alternative Calibration
Procedure Using NO
2
Permeation Tube
Commercial Precision
Dilution Systems
Permeation Tube System
Содержание 42iQD
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Страница 212: ...Servicing Power Supply Replacement 7 22 42iQD Instruction Manual Thermo Scientific Figure 7 26 Replacing Power Supply ...
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