Buongiorno a tutti, sono un nuovo iscritto di questo forum, avrei un quesito da porvi, ho un segnale 4-20 ma da convertire in millivolt, qualcuno mi potrebbe aiutare? Vi ringrazio anticipatamente per la collaborazione.

Mod: Used translate for you:

Goodmorning everyone. I'm new to the group, I have a question to ask you, I have a 4-20 signal but to convert to millivolts, could someone help me? I thank you in advance for your collaboration.

 

Hi 75.
Welcome to AAC.
Please translate your post to English.
E

 

[QUOTE = "ericgibbs, post: 1472471, membro: 73660"]
Ciao 75.
Benvenuti in CAA.
Per favore, traduci il tuo post in inglese.
E
[/ CITAZIONE]
[QUOTE = "ericgibbs, post: 1472471, membro: 73660"]
Ciao 75.
Benvenuti in CAA.
Per favore, traduci il tuo post in inglese.
E
[/CITAZIONE]
Buongiorno, intendi che devo scriverlo in inglese?

 

''Hello, do you mean I have to write it in English?''

hi,
Yes, this is an English text only site.
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Sì, questo è un sito solo in inglese

 

Un'immagine racconta più di mille parole.

 

hi,
I appreciate :
'An image tells a thousand words.' but the poster must use English text.

Moderation.
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Well, thank you!

 

Hello,

Turn off the auto translate in your browser and use english text please.

Bertus

 

Un'immagine racconta più di mille parole.
[/good morning, thanks for your interest, could you kindly tell me which integrated should I use? thank you

 

hi 75,
You could use a load resistor on the 20mA loop, that would give milli-Volts across the resistor.
Example, a 5R load resistor with a 20mA current would create 100mV signal, an OPA could be used to buffer the 5R from whatever you are driving.

I would use a typical type of circuit for the 20mA loop, a 250R load would give 5V for a 20mA current, then use a buffer OPA and resistive attenuator to give the mVolt signal.
This OPA could also be used to remove the zero mV offset voltage at 4mA loop current.

We need more information regarding the project with details of the actual mV required.

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I gathered the thread starter said he wants 0-120mV from 4-20mA. Only very quickly knocked out my circuit. Think it should work.
Would probably be better to have the op-amp working with higher voltages though. Lower noise. So have higher series resistor in the current loop and attenuate the output voltage.

 

Good morning, thanks for your interest, now let me explain better I have a 4-20 level probe input but I have to convert it into a signal that when the sona gives me 4ma I must have 0mv output while when I give 20ma I must have 120mv output, if any of you have a scheme with the components to be inserted for the realization of the converter. Thank you so much

 

hi 95,
What power supply voltages do you have available.?
You will require some type of OPA, which types do you have in stock.?

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the voltages available are from 3.3 v to 24 v dc

 

hi markus,
Are you able to buy a AD8515 OPA type.?
If yes, we can post a suitable circuit for 5V supply , 4mA to 20mA input and 0mV to 120mV output.
E

 

hello ericgibbs, I can buy the OPA AD8515, so if you want you can send me the scheme, thanks for the collaboration.

 

hi m,
This is one option, LTSpice simulation.
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hello ericgibbs, thank you very much, now I buy the components and do the test. as soon as I finish I will let you know the outcome. thanks again you have been very kind thanks.

 

hi,
Looking forward to seeing your test results.
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