Using the loop diagram from the Loop diagram calculate the maximum error for the
ID: 1972685 • Letter: U
Question
Using the loop diagram from the Loop diagram calculate the maximum error for the loop assuming an Intrinsically safe circuit with the errors and at the conditions as per the table below:
Device
Error
Reading
Level Transmitter
± 2 %
Full Scale
60%
Flow transmitter
± 2 %
Reading
40 %
IS Barrier
± 0.25 %
Full Scale
AI card
± 0.05 %
Full Scale
AO card
± 0.05 %
Full Scale
Valve Positioner
± 3 %
Reading
Valve Actuator
± 2 %
Full Scale
65%
a) Expand and complete the above table.
b) Calculate the error for the Input(s)
c) Calculate the error for the Output.
d) Calculate the error for the total loop.
Device
Error
Reading
Level Transmitter
± 2 %
Full Scale
60%
Flow transmitter
± 2 %
Reading
40 %
IS Barrier
± 0.25 %
Full Scale
AI card
± 0.05 %
Full Scale
AO card
± 0.05 %
Full Scale
Valve Positioner
± 3 %
Reading
Valve Actuator
± 2 %
Full Scale
65%
Explanation / Answer
https://www.acromag.com/sites/default/files/Acromag_Intro_TwoWire_Transmitters_4_20mA_Current_Loop_904A.pdf
http://www.datataker.com/Datalogger_Manual/Measuring%204-20mA%20Current%20Loops.htm
https://www.scribd.com/doc/274379442/LOOP-DIAGRAM
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