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'[OT] 4-20mA current sense (no contact)'
1998\06\25@151929 by Harrison Cooper

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OK, I asked this once before, and got some good leads, but none of them
worked out, and now its the 11th hour.

I have a 2 wire instrument that is loop powered at 24 VDC (the current
on the loop varies 4-20mA at 24 VDC depending on the output of the
probe).  I need to monitor the loop and trip a relay at a certain (adjustableurr
ent.

Sure, I could design a thing with a series resistor and monitor the
voltage with a couple of op-amps, but prefer an off the shelf solution.

email direct spam_OUThcooperTakeThisOuTspames.com

1998\06\26@065729 by Pavel Korensky

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At 09:17 25.6.1998 -0600, you wrote:
>OK, I asked this once before, and got some good leads, but none of them
>worked out, and now its the 11th hour.
>
>I have a 2 wire instrument that is loop powered at 24 VDC (the current
>on the loop varies 4-20mA at 24 VDC depending on the output of the
>probe).  I need to monitor the loop and trip a relay at a certain
(adjustableurrent.
>
>Sure, I could design a thing with a series resistor and monitor the
>voltage with a couple of op-amps, but prefer an off the shelf solution.
>
>email direct .....hcooperKILLspamspam@spam@es.com
>

Check the MAX4172 circuit from Maxim. This IC should work for you.

Best reagards

PavelK

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