Campbell-scientific 109SS Temperature Probe Manuel d'utilisateur télécharger pdf (Page 11)

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

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

0.005

0.01

0.015

0.02

0.025

0.03

-50 -40 -30 -20 -10 0 10 20 30 40 50 60 70

Error Degrees C

Temperature Degrees C

Steinhart & Hart - Tabulated values

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 31 32

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Campbell-scientific 109SS Temperature Probe Manuel d'utilisateur Page 11