Instrument - Chemiluminescence NO-NO2-NOx Analyzer
Chemiluminescence NO-NO2-NOx Analyzer
What is being measured:
Data recording software:
Data analysis software:
Custom Excel Program
Raw data time resolution:
Analysis data averaging:
Sensitivity to temperature (and correction method, if applicable):
Sensitivity to relative humidity (and correction method, if applicable):
Direct gas sampling
Sample preparation method:
Filter particle contents before sampling; One of the measuring streams is flowing through catalyst system to convert NOx to NO
Sample residence time (chamber to instrument) (seconds):
Length of tubing (cm):
Instrument flow rate:
Tubing inner diameter:
1/4'' OD; 0.152'' ID
Chemical identification method:
NO concentration is determined by Chemiluminescence method; NOx concentration is determined by the same method from another sample stream which flows through the catalyst box, assuming the catalyst can convert 100% of the NO2 into NO.
Data analysis method:
The raw signal is logged by the custom Labview program every second and is averaged to 1 min of the time range. Finally the data is pulled out by a custom Excel script.
[NO2] = [NOx] - [NO].
Standard NO and NOx gas with known concentrations was introduced into the instrument and calibration factor is calculated based on the comparison. THIS IS DONE EVERYTIME BEFORE AN EXPERIMENT.
Calibration drift estimate:
Uncertainty estimation method:
Link to supplemental information:
(a) Local_Time (N/A); (b) Experimental_Time (N/A); (c)NO_Concentration (+/- ?%); (d) NO2_Concentration (+/- ?%); (e) NOx_Concentration (+/- ?%)
(a) Local_Time (N/A); (b) Experimental_Time (N/A); (c)NO_Concentration (ppb); (d) NO2_Concentration (ppb); (e) NOx_Concentration (ppb)