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Sensor Calibration and Quality Assurance Procedures
Temperature
Equipment:
- Primary Rotronic MP101A RHT Sensor S/N 90768
- Secondary Rotronic MP101A RHT Sensor S/N 96628
- Secondary Li-Cor LI-1400 Data Logger S/N DLA 2289
Procedure:
The secondary temperature sensor is placed in the weather box near the primary sensor, so the two instruments are exposed to similar conditions. The secondary data logger is programmed with the appropriate logging routines for the secondary sensor. Power for the second instrument is tapped off the five volt supply of the main data logger. Data from the two sensors are then acquired simultaneously for a period of approximately one hour.
Sample Temperature Comparison
Data from the two sensors are compared using Excel. The values measured by the primary sensor are subtracted from the values measured by the secondary sensor, to determine the difference between the two. Data from the primary sensor are considered good if the data sets agree within the manufacturer’s specifications of ± 0.3 °C for instrument accuracy.
Temperature measurements are also checked periodically with a spirit thermometer. Though the thermometer does not have the degree of precision of the Rotronic probe, it is a simple single point check.
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