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Question About Transmitter Connection

05/14/2014 1:42 AM

Good morning everyone

Kindly asking you to help me to know the connection of transmitters like pressure transmitter and level transmitter, for example its connected to Junction Box and I dont know where it will go after junction box ?! and what does mean "Marshaling Capinet?

Thank you all

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#1

Re: Question about transmitter connection

05/14/2014 1:51 AM

Depending on the specific type of transmitter, there may be 2, 3, 4, or more wires that that ultimately need to connect to small terminals on a central processing device.

Because of distance, the main length of run between transmitter and processing device may need to be comparatively large, have additional shielding, etc.

A marshaling cabinet is basically an enclosure with terminal strips that allow the longer, larger field wiring to be connected to smaller wiring for final connection to the monitoring device.

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#2
In reply to #1

Re: Question about transmitter connection

05/14/2014 2:03 AM

Many thanks Tornado :)

It is two wires black and white. Is it connected you mean to terminal block inside marshaling cabinet ?

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#3
In reply to #2

Re: Question about transmitter connection

05/14/2014 2:10 AM

Yes, I think so. Two-wire schemes would be quite common for 4-20mA signaling loops, for instance.

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#4
In reply to #3

Re: Question about transmitter connection

05/14/2014 2:15 AM

Could you tell me which document could explain the connection in details because i have a huge documents and I dont know which one could have the wiring diagram ?

MANY THANKS

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#5
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Re: Question about transmitter connection

05/14/2014 2:20 AM

Usually the transmitter literature shows how it must be connected to the processing instrument; and/or the instrument literature shows how to connect various sensors. I am not aware of any single document that covers all possibilities.

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#6
In reply to #4

Re: Question about transmitter connection

05/14/2014 4:29 AM

"Loop drawing" or "termination drawing".

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#7
In reply to #6

Re: Question about transmitter connection

05/14/2014 4:51 AM

Gents,

Originally I am an electrical engineer and I am new at instrumentation, Could ou advice me what to read and what I need to be aware from ?

Thanks a lot

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#8
In reply to #7

Re: Question about transmitter connection

05/14/2014 8:01 AM

See #6 above.

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#9

Re: Question About Transmitter Connection

05/14/2014 1:43 PM

This is a sample Loop diagram with wire/cable routing:

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#10
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Re: Question About Transmitter Connection

05/15/2014 4:39 AM

Gents, could you tell me what is the shield that normally it is the third point within terminal block inside junction box? also it is appeared is in this picture and looks like a CT.

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#11
In reply to #10

Re: Question About Transmitter Connection

05/15/2014 8:06 AM

Where did you get your original electrical engineering degree that you spoke of?

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#12

Re: Question About Transmitter Connection

05/15/2014 9:39 AM

I was going to be nasty about this, but I will just say, you are in the wrong profession, go hire an actual instrumentation technician, and he will set it straight. If you don't already know what you are doing and have to ask a basic question like that, you are going to wind up costing your company many thousands of dollars. You can save yourself a lot of trouble, and possibly your own job, if you choose wisdom over folly.

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#13

Re: Question About Transmitter Connection

05/15/2014 4:30 PM

Someone might be able to help you if you provide some useful information, such as the make and model number of the specific instruments you have.

Also, there is much information available on the internet.

Fundamentals of Instrumentation and Process Control

You would do well to read/study/learn instrumentation and not have to depend on strangers to educate you in basic instrumentation functions/uses/rationale and wiring.

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#14

Re: Question About Transmitter Connection

05/15/2014 7:17 PM

I'm torn on this one, but I think I'll side with OP. At one point I was assigned to the Process Control Engineering Dept., and it was like being dropped on Mars! I knew all the basics about instrumentation and control systems and their components from a EE perspective, but I was clueless about the practical lingo which is very specialized.

Initially I asked many seemingly stupid/naive questions, and got answers from a roll of the eyes to "didn't they teach you anything to get your EE". Over time I started to "get it", ultimately working on the bowels of networked/computerized DCS and SCADA systems where the same I&C Engineers who belittled me for my lack of instrumentation knowledge had come to rely on my MSCS to help them understand how they computed/communicated.

Sometimes what goes around comes around. In the end it was a great learning experience for everyone, and I earned yet another tool for my engineering tool belt.

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#15

Re: Question About Transmitter Connection

05/15/2014 8:26 PM

If you are referring to the circular, red-outlined items (below),

those are shield/screens on signal cable, sometimes foil, sometimes braid (below) that are terminated on a terminal strip or ground point:

braided shield above

Foil shield with bare drain wire

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#16

Re: Question About Transmitter Connection

05/16/2014 9:36 AM

I just wanted everyone to know the OP, Mr. Abbas, sent me an email telling me to "get out of his face", and never do that again. Sounds like a threat to me, so here I will make a promise. Mr. ABBAS, I was not in your face, and I suggest you remove your face. I don't take kindly to threats, and you have been reported. Who are you to confront me at all?

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#17
In reply to #16

Re: Question About Transmitter Connection

05/16/2014 9:45 AM

M.ABBAS, just remember, if the truth hurts, maybe it should!

Your questions demonstrate a complete lack of knowledge of rudimentary electrical wiring, and the inability to gather information on your own.

Good luck, you're going to need it.

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#18
In reply to #17

Re: Question About Transmitter Connection

05/16/2014 9:46 AM

I think Mr. Abbas needs a visit from the FBI, or Homeland Security.

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