Central California Ozone Study (CCOS) - Desert Research Institute
Central California Ozone Study (CCOS) - Desert Research Institute
Central California Ozone Study (CCOS) - Desert Research Institute
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<strong>CCOS</strong> Field Operations Plan (DRAFT) Version 2: 5/31/00<br />
Table 2.4-4 (continued)<br />
Primary, calibration, performance test and performance audit standards and frequencies for <strong>CCOS</strong> measurements<br />
Observable<br />
Solar radiation by scanning<br />
spectrometer<br />
Expected<br />
Precision<br />
Primary Standard<br />
±20 w/m2 NIST standard<br />
luminance<br />
Calibration<br />
Standard<br />
Calibration<br />
Frequency<br />
Performance Test Standard<br />
Performance<br />
Test<br />
Frequency<br />
Factory calibration Prior to installation Portable certified lamp At start and<br />
end of study<br />
and 3 times<br />
during study<br />
Performance Audit<br />
Standard<br />
Performance<br />
Audit<br />
Frequency<br />
- -<br />
C2-C12 hydrocarbons from<br />
canisters by cryofocusing,<br />
gas chromatography and<br />
flame ionization<br />
± 10% NIST CH4 Certified CH4 and<br />
reference gases<br />
Each analysis<br />
session<br />
Reference gases, replicates, and blanks Every 10<br />
samples<br />
Certified NMHC<br />
sample introduced to<br />
sampler<br />
Once during<br />
study<br />
C8-C20 hydrocarbons from<br />
TENAX by thermal<br />
desorption, gas<br />
chromatography and flame<br />
ionization<br />
± 10% NIST CH4 Certified CH4 and<br />
reference gases<br />
Each analysis<br />
session<br />
Reference gases, replicates, and blanks Every 10<br />
samples<br />
Certified NMHC<br />
sample introduced to<br />
sampler<br />
Once during<br />
study<br />
C8-C7 carbonyls from<br />
DNPH by high pressure<br />
liquid chromatography and<br />
ultraviolet detection<br />
± 20 Aldehyde mixtures Aldehyde mixtures Each analysis<br />
session<br />
Reference mixtures, replicates, and<br />
blanks<br />
Every 10<br />
samples<br />
Certified NMHC<br />
sample introduced to<br />
sampler<br />
Once during<br />
study<br />
Wind speed by anemometer ±0.3 m/s Certified wind tunnel Factor calibration Prior to installation Visual check, synchronized motor when<br />
out of spec<br />
Daily and<br />
when needed<br />
Synchronized motor<br />
Once during<br />
study<br />
Wind direction by wind<br />
vane<br />
±10° from<br />
North<br />
Surveyor compass,<br />
solar azimuth<br />
Surveyor compass,<br />
solar azimuth<br />
Prior to installation<br />
Visual check, realignment when out of<br />
spec<br />
Weekly<br />
Surveyor compass,<br />
solar azimuth<br />
Once during<br />
study<br />
Temperature by platinum<br />
resistance or thermister<br />
±0.1 °C NIST thermometer<br />
and water bath<br />
Factory calibration Prior to installation Psychrometer Weekly Collocated<br />
temperature sensor<br />
Once during<br />
study<br />
Relative humidity by<br />
capacitance<br />
±2% NIST thermometer<br />
and dew cups<br />
Factory calibration Prior to installation Psychrometer Weekly Collocated humidity<br />
sensor<br />
Once during<br />
study<br />
Chapter 2: FIELD MEASUREMENTS 2-29
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