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Sensor Calibration and Quality Assurance Procedures
Photosynthetically Active Radiation/Quantum Sensors
Equipment:
- Li-Cor LI-190SA Primary Quantum Sensors S/N Q33278 & Q33279
- Li-Cor LI-190SA Secondary Quantum Sensors S/N Q28666 & Q31059
- Li-Cor LI-1400 Secondary Data Logger S/N DLA 2289
Procedure:
The secondary quantum sensors are placed next to the primary quantum sensors, so the instruments receive similar amounts of radiation. The secondary data logger is programmed with the appropriate logging routines and channel multipliers for the secondary sensors. Data are then acquired with all sensors simultaneously for one to two hours.
NOTE: Data for the integrated PAR sensor must be logged for a full hour after the hour in order to log a value. (i.e. Logging started at 2:45 must continue until after 4:00. The first point will be recorded at 4:00, not 3:00)
Sample Quantum Sensor Comparison
Data from the primary and secondary 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 sensors can be considered good.
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