Rockwell-automation 1734-IT2I Thermocouple and RTD Input Module User M Manual de usuario descargar pdf (Pagina 79)

69 Publication 1734-UM004F-EN-E - December 2012

Appendix

Calculate Absolute Accuracy and

Accuracy Drift

Overview

The Absolute Accuracy and Accuracy Drift with temperature specification

applies only to mV input for 1734-IT2I, and to ohms input for 1734-IR2 and

1734-IR2E modules. These specifications are listed in the POINT I/O RTD

and Isolated Thermocouple Input Module Installation Instructions,

publication 1734-IN011

Use mV input (1734-IT2I) or ohms input (1734-IR2 and 1734-IR2E) to verify

the Absolute Accuracy or Accuracy Drift of the POINT I/O modules.

Calculate with Formulas

Here are the formulas for calculating Absolute Accuracy and Accuracy Drift in

mV or ohms.

Absolute Accuracy Formula

Absolute Accuracy measurement is to be done at 25 ⋅ C. The formula to

calculate Absolute Accuracy is as follows:

[(measured value - expected value)/ full scale] x 100 %

Accuracy Drift Formula

Accuracy Drift measurement is to be done at 2 ambient Temperature points:

T1 and T2. The formula to calculate Accuracy Drift is as follows:

[(measured value (T2) - (measured value (T1)]/ [(T2 - T1) x full scale] x

1000 000

1 2 ... 74 75 76 77 78 79 80 81 82 83 84

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Rockwell-automation 1734-IT2I Thermocouple and RTD Input Module User M Manual de usuario Pagina 79