Rockwell-automation 1746-NR4 SLC RTD/Resistance Input Module User Manu Manuel d'utilisateur télécharger pdf (Page 15)

Publication 1746-UM008B-EN-P - December 2006

Overview 15

When you are using 100 Ω or 200 Ω platinum RTD units with 0.5 mA

excitation current, refer to the following important information about

module accuracy.

IMPORTANT

Module accuracy, using 100 Ω or 200 Ω platinum RTD units with 0.5 mA

excitation current, depends on the following criteria:

• Module accuracy is ±0.6 °C (±33.08 °F) after you apply power to the

module or perform an autocalibration at 25 °C (77 °F) ambient with

module operating temperature at 25 °C (77 °F).

• Module accuracy is ±(0.6 °C + ΔT x 0.034 °C/°C) or

±(33.08 °F + ΔT x 32.06 °F/°F) after you apply power to the module or

perform an autocalibration at 25 °C (77 °F) ambient with the module

operating temperature between 0…60 °C. (32…140 °F).

Where ΔT is the temperature difference between the actual

operating temperature of the module and 25 °C (77 °F) and

0.034 °C/°C (32.06 °F/°F) is the temperature drift shown in the table

above for 100 Ω or 200 Ω platinum RTD units.

Module accuracy is ±1.0 °C (±33.80 °F) after you apply power to the

module or perform an autocalibration at 60 °C (140 °F) ambient with

module operating temperature at 60 °C (140 °F).

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Rockwell-automation 1746-NR4 SLC RTD/Resistance Input Module User Manu Manuel d'utilisateur Page 15