Short name:
T/RH/O3/NOx

Full name:
Temperature & humidity probes + ozone and NOx monitors

What is being measured:
temperature, relative humidity, O3, NO, NO2/NOy

Sampling Protocol:
Online

Manufacturer:
Thermo Scientific, Vaisala

Model:
42i, 49i

Instrument year :
None specified

Data recording software:
Custom labview program

Data analysis software:

Raw data time resolution:
30 s

Analysis data averaging:

Detection limit:
1 ppb O3, 0.5 ppb NOx

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):
100

Instrument flow rate:
1 lpm

Tubing inner diameter:
0.16 in

Tubing material:
FEP Teflon

Chemical identification method:
O3: Photometric (UV absorption) NO: Chemiluminescence NO2: Conversion to NO by molybdenum catalyst, then chemiluminescence

Data analysis method:

Quantification method:

Calibration method:
NOx: calibrated with NO & NO2 primary standards O3: cross-calibrated with an ozone generator & FT-IR spectrometer RH: salt solutions

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

Calibration schedule:
Annually

Uncertainty estimation method:
Inquire with PI

Known interferences:
NOy can interfere with NO2 by conversion on molybdenum catalyst; high (ppm) levels of H2O2 can interfere with O3

Link to supplemental information:

Additional notes:

Measurement uncertainty:
NOx: 20%; O3: 10%; RH/T: 10%

Measurement units:
T: ˚C; RH: %; O3/NOx: ppb.