Rockwell-automation 1771-IXE Thermo/MV Input Installation Instructions Manual de usuario descargar pdf (Pagina 13)

Thermocouple/Millivolt Input Module 13

Publication 1771Ć5.49 - October 1996

Modules are typically calibrated at 25

• If the I/O chassis in which the 1771-IXE is operating is at

C, column A represents the maximum error for that

thermocouple type.

• If the chassis operating temperature is less than or greater than

C, use the formula below to calculate the maximum error.

Maximum Error = Col-A + (∆T x Col-B)

Where: Col-A = the value from column A

∆T = the I/O chassis operating temperature minus 25

Col-B = the value from column B

For Example:

If the I/O chassis is operating at 60

C, and a Type J Thermocouple is being used, then:

Maximum Error = ColumnA+(∆T x Column B)

= 0.78+ [(60 - 25) x 0.0423]

= 0.78 + (35 x 0.0423)

= 0.78 + 1.4805

= 2.2605

Millivolt Range Accuracy

Millivolt

Range

Max Error

@ Calibration

Temperature (25

Millivolt Drift

-100 to 100 +8.85uV +3.856uV/

Radiated Noise Susceptibility

Radiated Noise Susceptibility Error

300-1000MHz Circular Wave, Field Strength = 10V/M <+1%

Allowable Distances

The open thermocouple detection circuit injects a current of

approximately 7.3 nanoamps into the thermocouple cable. A total

lead resistance of 1370 ohms (685 ohms one–way) cable resistance

will produce +1 count (10uV) of error.

Lead Resistance

Compensation

1 2 ... 8 9 10 11 12 13 14 15 16

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Rockwell-automation 1771-IXE Thermo/MV Input Installation Instructions Manual de usuario Pagina 13