Instrument - Chemiluminescence NO/NOx analyzer
Short name:
NOx monitor
Full name:
Chemiluminescence NO/NOx analyzer
What is being measured:
NO, NOx
Sampling Protocol:
Online
Manufacturer:
Teledyne
Model:
Model 200E
Instrument year
:
None specified
Data recording software:
Labview
Data analysis software:
Raw data time resolution:
1 minute
Analysis data averaging:
Detection limit:
0.4 ppb
Sensitivity to temperature (and correction method, if applicable):
:
Sensitivity to temperature value unknown. Correction method is built into instrument (since the density of the sample gas affects brightness of chemiluminescence reaction). Temperature cell is maintained at 50C.
Sensitivity to relative humidity (and correction method, if applicable):
:
Instrument is sensitive to humidity changes. A dryer for supply air is recommended to compensate for this. For chamber experiments, humidity is kept at a constant value so no dryer is used and no corrections are made.
Sampling method:
Direct sampling
Sample preparation method:
None
Sample residence time (chamber to instrument) (seconds):
Length of tubing (cm):
Instrument flow rate:
500 cm3/min
Tubing inner diameter:
1/4 inch
Tubing material:
FEP Teflon
Chemical identification method:
Monitor calculated the amount of NO present by measuring the amount of chemiluminescence given off when the sample gas is exposed to ozone (O3). A catalytic-reactive converter converts any NO2 in the sample gas to NO, which is then measured as above (including the original NO in the sample gas) and reported as NOx. NO2 is calculated as the difference between NOX and NO.
Data analysis method:
Quantification method:
Calibration method:
Calibrated with NO and NO2 gas cylinder standards, with flow rates and concentrations controlled by a mass flow controller and mixing with a zero air stream.
Calibration drift estimate:
Low (on the order of weeks)
Calibration schedule:
Monthly
Uncertainty estimation method:
To be filled
Known interferences:
HONO
Link to supplemental information:
Additional notes:
Measurement uncertainty:
Measurement units: