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'4-20mA transmitter [slighty OT]'
1999\11\10@152700 by Darren Logan

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Hi

   Has anyone had any experience in the design of a u-processor based 2-wire,
   4-20mA transmitter?

   How is the electronics supply kept separate from the 4-20mA measurement
signal?
   How is the 4-20mA kept stable as the electronics supply current varies?

   Are there specific 4-20mA add-on chips you can buy that sort out the above
   problems for you?

   Any info. greatly appreciated.

Daz

1999\11\10@160909 by Harrison Cooper

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face
I was looking for a PC/104 based unit, and thought I found one...till I was
told it was vaporware.  Can't figure out how it was in the catalog, we
ordred it, and a month later the engineer called me and said they had to
redesign it because of noise problems.

Anyway, to cut to the chase, Analog Devices and Burr Brown both have 4-20mA
interface chips.  Put in voltage and get out 4-20mA proportionally.  But
never used em...but they are available.

1999\11\11@134351 by Tom Handley

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  Darren, check out Burr-Brown's XTR series transmitters at:

     http://www.burr-brown.com/

  - Tom

At 03:25 PM 11/10/99 EST, Darren Logan wrote:
>Hi
>
>    Has anyone had any experience in the design of a u-processor based
2-wire,
>    4-20mA transmitter?
>
>    How is the electronics supply kept separate from the 4-20mA measurement
>signal?
>    How is the 4-20mA kept stable as the electronics supply current varies?
>
>    Are there specific 4-20mA add-on chips you can buy that sort out the
above
>    problems for you?
>
>    Any info. greatly appreciated.
>
>Daz


------------------------------------------------------------------------
Tom Handley
New Age Communications
Since '75 before "New Age" and no one around here is waiting for UFOs ;-)

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