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from the electronics and instrumentation department...
how to convert 4-20 ma to 0-5v
Engineering and workplace issues. topic
Posted by bharath on 1 March, 2011 - 11:33 am
sir....
after subtract the 1 volt from the 0-5ma to 1-5v converter circuit I get 0 to 4 volt. How to scale the 1.25 volts after we use the subtractor circuit?


Posted by Ken Emmons Jr. on 1 March, 2011 - 1:20 pm
You can scale it with a simple resistor in the 4-20mA loop. See analysis below:

0.004 * 312.5 ohms = 1.25V
0.020 * 312.5 ohms = 6.25V

Now offsetting approx -1.25 volts gets you there.

I arrived at this by saying that we want 16ma to equate to 5V span.

KEJR


Posted by pascal on 1 March, 2011 - 1:51 pm
How do you do your conversions? using operational amplifier?
if yes it is quite easy to do an amplifier with a 1.25 gain!


Posted by Enr on 1 March, 2011 - 4:06 pm
Likely this amazing fully scalable signal conditioner from Pepperl Fuchs could help you:
http://files.pepperl-fuchs.com/selector_files/navi/productInfo/edb/ 188750_eng.pdf

If you can't open the link, then try "googling" "KFU8-USC-1.D" and Pepperl Fuchs

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