Measurement-computing WEB-TEMP Bedienungsanleitung PDF herunterladen (Seite 32)

WEB-TEMP User's Guide Specifications

Note 7: Error shown does not include errors of the sensor itself. These specs are for one year while operation

of the WEB-TEMP unit is between 15 °C and 35 °C. Contact your sensor supplier for details on the

actual sensor error limitations.

RTD measurement accuracy

Table 6. RTD measurement accuracy specifications

RTD

Sensor temperature

(°C)

Accuracy error (°C)

maximum

Accuracy error (°C)

typical

Tempco (°C/°C)

PT100, DIN,

US or ITS-90

–200

2.913

2.784

0.001

–150

1.201

1.070

0.001

–100

0.482

0.349

0.001

0.261

0.124

0.001

100

0.269

0.127

0.001

300

0.287

0.136

0.001

600

0.318

0.150

0.001

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 accuracy and tempco specifications include the accuracy of

the Callendar-Van Dusen linearization algorithm. The specification does not include lead resistance

errors for 2-wire RTD connections. 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 WEB-TEMP 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 ohmic value. To ensure this, use connection leads of equal lengths.

Thermistor measurement accuracy

Table 7. Thermistor measurement accuracy specifications

Thermistor

Sensor

temperature (°C)

Accuracy error

maximum (°C)

Accuracy error

typical (°C)

Tempco (°C/°C)

2252 Ω

–40

0.001

0.0007

0.001

0.021

0.008

0.001

0.263

0.130

0.001

120

3.473

1.750

0.001

5000 Ω

–35

0.001

0.0006

0.001

0.009

0.004

0.001

0.115

0.049

0.001

120

1.535

0.658

0.001

10000 Ω

–25

0.001

0.0005

0.001

0.005

0.002

0.001

0.060

0.028

0.001

120

0.771

0.328

0.001

30000 Ω

–10

0.001

0.0005

0.001

0.002

0.001

0.019

0.009

0.001

120

0.267

0.128

0.001

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