Measurement-computing WLS-TEMP Manuel d'utilisateur télécharger pdf (Page 26)

WLS-TEMP Specifications

RTD measurement accuracy

Table 6. RTD measurement accuracy specifications

RTD

Sensor

Temperature (°C)

Maximum Accuracy Error (°C)

= 210 µA

Typical Accuracy Error (°C)

= 210 µA

PT100, DIN, US or

ITS-90

–200 to –150

±2.85

±2.59

–150 to –100

±1.24

±0.97

–100 to 0

±0.58

±0.31

0 to 100

±0.38

±0.11

100 to 300

±0.39

±0.12

300 to 600

±0.40

±0.12

Note 8: Error shown does not include errors of the sensor itself. The sensor linearization is performed using a

Callendar-Van Dusen linearization algorithm. These specs are for one year while operation of the

device is between 15 °C and 35 °C. The specification does not include lead resistance errors for 2-wire

RTD connections. Please contact your sensor supplier for details on the actual sensor error limitations.

Note 9: Resistance values greater than 660 Ω cannot be measured by the device in the RTD mode. The 660 Ω

resistance limit includes the total resistance across the current excitation (±Ix) pins, which is the sum of

the RTD resistance and the lead resistances.

Note 10: For accurate three wire compensation, the individual lead resistances connected to the ±Ix pins

must be of equal value.

Thermistor measurement accuracy

Table 7. Thermistor measurement accuracy specifications

Thermistor

Temperature range (°C)

Maximum accuracy error (°C)

= 10 µA

2252 Ω

–40 to120

±0.05

3000 Ω

–40 to120

±0.05

5000 Ω

–35 to120

±0.05

10000 Ω

–25 to120

±0.05

30000 Ω

–10 to120

±0.05

Note 11: Error shown does not include errors of the sensor itself. The sensor linearization is performed

using a Steinhart-Hart linearization algorithm. These specs are for one year while operation of the

device is between 15 °C and 35 °C. The specification does not include lead resistance errors for 2-wire

thermistor connections. Please contact your sensor supplier for details on the actual sensor error

limitations. Total thermistor resistance on any given channel pair must not exceed 180 k Ω. Typical

resistance values at various temperatures for supported thermistors are shown in Table 8.

Table 8. Typical thermistor resistance specifications

Temp

(°C)

2252 Ω

thermistor

3000 Ω

thermistor

5 kΩ

thermistor

10 kΩ

thermistor

30 kΩ

thermistor

–40

76 kΩ

101 kΩ

168 kΩ

240 kΩ (Note 12)

885 kΩ (Note 12)

–35

55 kΩ

73 kΩ

121 kΩ

179 kΩ

649 kΩ (Note 12)

–30

40 kΩ

53 kΩ

88 kΩ

135 kΩ

481 kΩ (Note 12)

–25

29 kΩ

39 kΩ

65 kΩ

103 kΩ

360 kΩ (Note 12)

–20

22 kΩ

29 kΩ

49 kΩ

79 kΩ

271 kΩ (Note 12)

–15

16 kΩ

22 kΩ

36 kΩ

61 kΩ

206 kΩ (Note 12)

–10

12 kΩ

17 kΩ

28 kΩ

48 kΩ

158 kΩ

–5

9.5 kΩ

13 kΩ

21 kΩ

37 kΩ

122 kΩ

7.4 kΩ

9.8 kΩ

16 kΩ

29 kΩ

95 kΩ

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Measurement-computing WLS-TEMP Manuel d'utilisateur Page 26

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