Instrument - Chemiluminescence NO/NOx analyzer

Short name:
NOx monitor

Full name:
Chemiluminescence NO/NOx analyzer

What is being measured:

Sampling Protocol:


Model 200E

Instrument year :
None specified

Data recording software:

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:

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:

Uncertainty estimation method:
To be filled

Known interferences:

Link to supplemental information:

Additional notes:

Measurement uncertainty:

Measurement units: