Campbell Scientific 110PV Surface Temperature Probe - Manual (Page 9)

110PV Surface Temperature Probe
2. Accuracy
The overall probe accuracy is a combination of the thermistor's
interchangeability specification and the accuracy of the bridge resistor. The
Steinhart-Hart equation used to calculate temperature has a negligible error
(Figure 2-1). In a "worst case" the errors add to an accuracy of ±0.2
°C over
the range of -40 ° to 70°C; ±0.5°C over the range of 71°C to 105°C; and ±1°C
from 106 °C to 135°C. The major error component is the interchangeability
specification (tolerance) of the thermistor. The bridge resistor has a 0.1%
tolerance with a 10 ppm temperature coefficient. Figures 2-2 to 2-7 show the
possible worst case probe and measurement errors.
FIGURE 2-1. Steinhart-Hart Error
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