Campbell-scientific 109-L Temperature Probe Bedienungsanleitung PDF herunterladen (Seite 13)

Model 109 Temperature Probe

Steinhart-Hart

Linearization Error: ≤ 0.03 °C (–50 to 70 °C)

Probe Weight and Dimensions

Weight with 10 ft cable: 136 g (5 oz)

Length: 10.4 cm (4.1 in)

Diameter: 0.762 cm (0.3 in)

See FIGURE 6-1, Worst-case probe and measurement errors, and FIGURE 6-2, Steinhart-Hart

linearization error. Overall probe accuracy is a combination of thermistor interchangeability,

bridge-resistor accuracy, and error of the Steinhart-Hart equation. Interchangeability is the

principle component error and is predominantly offset. Offset can be determined with a single-

point calibration. Offset can be entered in the Therm109() instruction Offset parameter. The

bridge resistor has a 0.1% tolerance with a 10 ppm temperature coefficient. At temperature

extremes, the possible error in the CR200(X) series datalogger measurement may be greater than

the error that exists in the probe.

FIGURE 6-1. Worst case probe and measurement errors

-0.1

6E-16

0.1

0.2

0.3

0.4

0.5

0.6

0.7

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

Possible Error Degrees C

Temperature Degrees C

Worst Case Errors in 109 Temperature Measurement

Thermistor

Tolerance

CR200 Bridge

Measurement

Error (0.06% of

reading + 2.4 mV)

CR200 Resolution

(0.6 mV)

24.9 kΩ Resistor

Tolerance (0.1%

+ 10 ppm/°C

away from 25 °C)

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 29 30

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Campbell-scientific 109-L Temperature Probe Bedienungsanleitung Seite 13