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4-20mA current
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ICE Society Forum Index » Control Forums » Process Control
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shiminOffline
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Post   Posted: Nov 21, 2007 - 12:15 AM Reply with quote Back to top
Post subject: 4-20mA current
why we transmitting 4-20mA current
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instruiteOffline
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Post   Posted: Nov 21, 2007 - 08:25 AM Reply with quote Back to top
shimin wrote:
why we transmitting 4-20mA current
please be more specific with your query...

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sirishaOffline
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Post   Posted: Nov 22, 2007 - 09:58 AM Reply with quote Back to top
Hello shimin,

We use 4-20mA signal for data transmission,because it is the standard the standard signal being used. We use this current signalling because it is insensitive to electrical noise.

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Sirisha Smile
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shiminOffline
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Post   Posted: Nov 23, 2007 - 03:05 AM Reply with quote Back to top
Post subject: atten:sirisha
why we transmitting 4-20ma,not 0-20ma.in electcal tansmission we use high voltage whats its reason
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nitaOffline
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Post   Posted: Nov 24, 2007 - 10:51 AM Reply with quote Back to top
we use 4 -20ma because in case of any fault in line...we cannot detect 0 signal wen its already 0.
but if its 4 ma u can easily detect the signal wen its faulty bcoz signal at dat time will be showing 0 instead of 4 ma.
and as sirisha already wrote that is also a one reason.
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nitaOffline
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Post   Posted: Nov 24, 2007 - 11:03 AM Reply with quote Back to top
Post subject: hi
sme files usefull for understanding 4-20ma.
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Mike_wOffline
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Post   Posted: Jan 14, 2010 - 01:48 PM Reply with quote Back to top
Suprised no body mentioned about over coming resistance in conductors as appose to 2-10/v
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sirishaOffline
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Post   Posted: Jan 20, 2010 - 09:27 AM Reply with quote Back to top
Can u elaborate Mr. Mike?
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RAHUL4554Offline
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Post   Posted: Sep 26, 2010 - 09:50 AM Reply with quote Back to top
This is very similar to why we using 3-15psig as standard signal in pneumatics.
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azharniceOffline
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Post   Posted: Sep 13, 2011 - 05:46 AM Reply with quote Back to top
Post subject: Re: 4-20mA current
shimin wrote:
why we transmitting 4-20mA current






why we are not using voltage levels instead of 4...20mA????
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