Campbell Scientific 108-L Temperature Probe - Manual (Page 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.
1 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
Erro
r (
°C)
Actual Temperature (°C)
Edlog Error
CRBasic Therm108() Error
5