1. worst-case probe and measurement errors, 2. steinhart-hart linearization error – Campbell Scientific 109SS Temperature Probe User Manual
Page 11
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Model 109SS Temperature Probe
Maximum
Steinhart-Hart
Linearization Error:
0.02 °C at –40 °C
FIGURE 6-1. Worst-case probe and measurement errors
FIGURE 6-2. Steinhart-Hart linearization error
1
The overall probe accuracy is a combination of the thermistor interchangeability specification and the
accuracy of the bridge resistor. The Steinhart-Hart equation used in CRBasic instruction
Therm109()
(CRBasic dataloggers) has negligible error. The major error component is the interchangeability
specification of the thermistor. The bridge resistor has a 0.1% tolerance with a 10 ppm temperature
coefficient.
-0.005
0
0.005
0.01
0.015
0.02
0.025
0.03
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
70
Er
ror
D
egr
ees
C
Temperature Degrees C
Steinhart & Hart - Tabulated values
5
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