Instrument - Photometric ozone analyzer

Short name:
O3 monitor

Full name:
Photometric ozone analyzer

What is being measured:
Ozone concentration

Sampling Protocol:



Instrument year :
None specified

Data recording software:

Data analysis software:

Raw data time resolution:
1 minute

Analysis data averaging:

Detection limit:
ppb level

Sensitivity to temperature (and correction method, if applicable): :

Sensitivity to relative humidity (and correction method, if applicable): :

Sampling method:
Direct sampling

Sample preparation method:

Sample residence time (chamber to instrument) (seconds):

Length of tubing (cm):

Instrument flow rate:

Tubing inner diameter:

Tubing material:
FEP Teflon

Chemical identification method:
The Model 400E photometric ozone analyzer is a microprocessor-controlled analyzer that measures low ranges of ozone in ambient air using a method based on the Beer-Lambert law, an empirical relationship that relates the absorption of light to the properties of the material through which the light is traveling over a given distance. The intensity of an ultra violate light is measured after it passes through a chamber, called the sample cell, where it is absorbed in proportion to the amount of ozone present. Every three seconds, a switching valve alternates measurement between a gas stream containing ozone and a stream that has been scrubbed of ozone.

Data analysis method:

Quantification method:

Calibration method:
Cross-calibrated with another ozone monitor. Ozone generator is used to generate fixed concentration of O3 and monitors are cross-calibrated together.

Calibration drift estimate:
Low (on the order of weeks)

Calibration schedule:
As Needed

Uncertainty estimation method:
To be filled

Known interferences:
Select aromatic compounds, mercury vapors

Link to supplemental information:

Additional notes:

Measurement uncertainty:

Measurement units: