Emerson 644 Manuel d'utilisateur télécharger pdf (Page 20)

Reference Manual

00809-0400-4728, Rev AA

June 2011

Rosemount 644

2-10

Lead wire imbalance seen by the transmitter = 0.5 

• Pt100 2-wire RTD:

Lead wire resistance seen by the transmitter = 150 m × 2 wires ×

0.025

/m = 7.5 

Basic error

0.5 

0.00385  /  C100 

--------------------------------------------------------------------------------- - 1.3 C==

Error due to amb. temp. var. of 25 °C

0.0039  /  C25 C 0.5 

0.00385  /  C100

-------------------------------------------------------------------------------------------------------

0.1266C==

Basic Error

Lead Wire Resistance





----------------------------------------------------------

Error due to amb. temp. variation



T

amb

 Lead Wire Resistance



R



-----------------------------------------------------------------------------------------------------------------=

Basic error

7.5 

0.00385  /  C100 

--------------------------------------------------------------------------------- -

19.5 C==

Error due to amb. temp. var. of 25 °C

0.0039  /  C25 C 7.5 

0.00385  /  C100

-------------------------------------------------------------------------------------------------------

1.9 C==

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