Instrument Loop diagram

learner · Mar 9, 2011

Hi all,

Can we show the wires providing 120VAC power to a four wire flow transmitter on the Instruments Loop Diagram?

I don't know why I think we should be showing the 4-20mA signal Only.

Thanks

Tom Jenkins · Mar 9, 2011

I don't know if it conforms to ISA standards, but I always show external power to a transmitter, particularly 120 VAC, on my loop diagrams.

OZEE · Mar 9, 2011

As far as I'm concerned, you can show whatever you want -- they're YOUR drawings. The information on those drawings is intended to make it easier/faster for you to troubleshoot your system - and as much RELEVANT info as you can include is always better.

learner · Mar 9, 2011

Thanks. I agree. i just needed a second openion. I believe it's better to show the instruments source of energy.

Thanks again

shooter · Mar 9, 2011

if the fuse blows how can i find the source when it is not on the drawing???

Instrument Loop diagram

learner

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Tom Jenkins

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OZEE

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learner

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shooter

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