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cyleow
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Join Date: May 2008
Posts: 2

Ohm Signal Convert to 4 - 20mA or 1 - 5V Circuit Diagram

05/27/2008 1:30 PM

Hi all Expert,

I need a circuit diagram that convert 0ohm - 100M ohm to 4 - 20mA or 1 - 5v, with the zero and span adjust. Means when the input signal is around 0-500ohm and I can adjust the zero point to 4mA or 1V. And the the input signal is around 100M, then I can adjust the span point to 20mA or 5V. Hope that I could get some help from you all, Thanks
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Epke
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Good Answers: 38
#1

Re: Ohm Signal Convert to 4 - 20mA or 1 - 5V Circuit Diagram

05/27/2008 10:53 PM

well i am not sure what application changes its Ohm value but your best bet would be to use some opamps to accomplish this.

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Anonymous Poster
#2

Re: Ohm Signal Convert to 4 - 20mA or 1 - 5V Circuit Diagram

05/27/2008 11:40 PM

There are a few instrument manufacturers that will modify std ohm-to-mA converters to specific requested ranges. Brands such as: APCS, MTL, Moore Industries, MANN, Intech and others. I know APCS will make virtually anything you would like that will output 4-20mA.
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kvsubramanyam
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Join Date: Apr 2007
Location: Hyderabad, India
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#3

Re: Ohm Signal Convert to 4 - 20mA or 1 - 5V Circuit Diagram

05/28/2008 1:49 AM

I made one recently. Contact me on my mail ID as I am very poor on uploading pictures.

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Anonymous Poster
#4

Re: Ohm Signal Convert to 4 - 20mA or 1 - 5V Circuit Diagram

05/28/2008 3:22 AM

hi

the best way is to buy resistance to current converter which available everywhere in the world with zero and span screw adjustment.

it is very easy to convert 4-20 ma to 1-5 volt by passing the current through 250 ohm resistance.

thanks for your time
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logix101
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Join Date: Jan 2008
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#5

Re: Ohm Signal Convert to 4 - 20mA or 1 - 5V Circuit Diagram

05/28/2008 7:28 AM

Also try www.omega.com they have some of these and can set the devices up to your spects.

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