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Sensor Calibration and Quality Assurance Procedures
Photosynthetically Active Radiation/Pyranometer
Equipment:
- Li-Cor LI-200SA Primary Pyranometer Sensor S/N PY47192
- Li-Cor LI-200SA Secondary Pyranometer Sensor S/N PY30760
- Li-Cor LI-1400 Secondary Data Logger S/N DLA 2289
Procedure:
The secondary pyranometer is placed next to the primary pyranometer, so the two instruments receive similar amounts of radiation. The secondary data logger is programmed with the appropriate logging routine and channel multiplier for the secondary sensor. Data from both sensors are then acquired simultaneously for a period of one to two hours.
Sample Pyranometer Comparison
Data from the two sensors are compared using Excel. After a graphical inspection, the values measured by the primary sensor are subtracted from the values measured by the secondary sensor, to determine the difference between the two. This difference value is then divided by the average of the two measured values, which results in a percentage.
If the difference between the values measured by the two sensors is within the manufacturer’s specifications of ± 5% for instrument accuracy, data from the primary sensor can be considered good.
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