Campbell-scientific 108-L Temperature Probe Manual do Utilizador descarregar pdf (Página 11)

Model 108 Temperature Probe

Edlog Polynomial (P55)

Linearization Error: <±0.5 °C (–5 to 95 °C)

<±0.1 °C (–3 to 90 °C)

FIGURE 6-1. Linearization error, where error is the difference between

actual and datalogger-computed temperature.

The overall probe accuracy is a combination of the thermistor interchangeability specification, the

precision of the bridge resistors, and the error of the Steinhart-Hart equation used in the CRBasic

instruction Therm108() (CRBasic dataloggers), or the error of the polynomial equation used in the

Edlog Polynomial (P55) instruction (Edlog dataloggers). The major error component is the

interchangeability specification of the thermistor. For the range of 0° to 50°C, the

interchangeability error is predominantly offset and can be determined with a single point

calibration. The offset can be entered in the measurement instruction Offset parameter. Bridge

resistors have 0.1% tolerance with a 10 ppm temperature coefficient.

Probe Length: 10.4 cm (4.1 in)

Probe Diameter: 0.762 cm (0.3 in)

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

-0.5

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

0.5

-10 0 10 20 30 40 50 60 70 80 90 100

Error (°C)

Actual Temperature (°C)

Edlog Error

CRBasic Therm108() Error

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 29 30

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Campbell-scientific 108-L Temperature Probe Manual do Utilizador Página 11