8.2.3 Temperature and Temperature Difference
The
simplest acceptance test for temperature and temperature difference would be
a two point test, room temperature and a stirred ice slurry. A reasonably
good mercury-in-glass thermometer with some calibration pedigree can be used
to verify agreement to within 1 °C. It is important to stir the liquid to
avoid local gradients. It should not be assumed that a temperature
difference pair will read zero when being aspirated in a room. If care is
taken that the air drawn into each of the shields comes from the same well
mixed source, a zero reading might be expected.
A
second benefit of removing the transducers from the shields for an
acceptance test comes to the field calibrator and auditor. Some designs are
hard to remove and have short leads. These conditions can be either
corrected or noted when the attempt is first made in the less hostile
environment of a receiving space.
8. QUALITY ASSURANCE AND QUALITY CONTROL
8.1 Instrument Procurement
8.1.1 Wind Speed
8.1.2 Wind Direction
8.1.3 Temperature and Temperature Difference
8.1.4 Dew Point Temperature
8.1.5 Precipitation
8.1.6 Pressure
8.1.7 Radiation
8.2 Installation and Acceptance Testing
8.2.1 Wind Speed
8.2.2 Wind Direction
8.2.3 Temperature and Temperature Difference
8.2.4 Dew Point Temperature
8.2.5 Precipitation
8.2.6 Pressure
8.2.7 Radiation
8.3 Routine Calibrations
8.3.1 Sensor Check
8.3.2 Signal Conditioner and Recorder Check
8.3.3 Calibration Data Logs
8.3.4 Calibration Report
8.3.5 Calibration Schedule/Frequency
8.3.6 Data Correction Based on Calibration Results
8.4 Audits
8.4.1 Audit Schedule and Frequency
8.4.2 Audit Procedure
8.4.3 Corrective Action and Reporting
8.5 Routine and Preventive Maintenance
8.5.1 Standard Operating Procedures
8.5.2 Preventive Maintenance
8.6 Data Validation and Reporting
8.6.1 Preparatory Steps
8.6.2 Levels of Validation
8.6.3 Validation Procedures
8.6.4 Schedule and Reporting
8.7 Recommendations
