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PICList Thread
'[OT] 4-20ma to 0-10V Sensor questions'
1998\04\15@133524 by Montaigne, Mike

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The defacto standard input on Omega & other sensors seems to be
2-20ma with an internal impedance of about 1K.  Does anyone
have a simple circuit to convert 0-5 volts from an PIC, or
0-10 volts from an external A-D on a PC which we are using now
to this 2-20ma standard?  tks

Mike Montaigne
Atomic Energy of Canada Ltd.
Station 18, Chalk River, Ontario
K0J 1J0, Canada

Phone (613) 584-3311 Ex. 4005
Fax:     (613) 584-4040
email:   spam_OUTmontaignemTakeThisOuTspamaecl.ca

1998\04\15@140645 by Mark Lezama

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part 0 2046 bytes content-type:text/x-vcard; charset=us-ascii; name="vcard.vcf" (decoded 7bit)

I will tray to show you with a ASCII art, but I never do that:

                                                                   Vcc

|

|

>
                                                                      <


>

|
                                          1/4  LM324          |
                                                |------ |           /
                  1-5V o------------ |  +      |       | /
                                   |--------|  -       | ---  |
2n2222
                                   |            |-------|       | \
                                   |
\
                                   |
|    E
                                   |
|
                                   |
+---------------------o

|
4-20ma
                                   |
                                   |---------------------
+---------------------o

|

|

>

<   250

>

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                                                                    GND

as you can see I am very bad for this but I think you will be able to
understand. This circuit is usefull for 1-5V to 4-20 ma. you need do
some change for 0-5V to 4-20ma.



Montaigne, Mike escribis:

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1998\04\15@142155 by Chris Eddy

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Chris Eddy, PE

Montaigne, Mike wrote:

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1998\04\15@150952 by Montaigne, Mike

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tks for your reply Chris:
I am going into a Omega PCM1 which is a 4-20ma control to
Solid State Relay controller.  It allows Proportional control of ac,
similar to a light dimmer.

There is no ground reference, so sink or source does not matter,
but I would appreciate both if you don't mind.  The one with the trim
pots would be useful also.

My fax is 613-584-4040 or e-mail me a postscript file if that's easier.

I did find a circuit with 0-10v input using a TEA1007 which is an
obscure
AC controller chip.

tks again for your help
Mike

{Quote hidden}

1998\04\16@054622 by Justin Grimm

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Use a xtr110 ic
it does everything for you
I forgot who makes them
Justin Grimm    @spam@reaperKILLspamspamsouthwest.com.au


----------
{Quote hidden}

1998\04\16@110524 by Harrison Cooper

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                               ----------

                       Use a xtr110 ic
                       it does everything for you
                       I forgot who makes them
                       Justin Grimm    TakeThisOuTreaperEraseMEspamspam_OUTsouthwest.com.au



                       Does anyone have info on this chip?

1998\04\16@113017 by Philip Starbuck

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>                                ----------
>
>                        Use a xtr110 ic
>                        it does everything for you
>                        I forgot who makes them
>                        Justin Grimm    RemoveMEreaperspamTakeThisOuTsouthwest.com.au
>
>
>
>                        Does anyone have info on this chip?

Burr Brown its a good part that has been out there for years, it makes
implemetation a snap!This is the "precision" device

http://www.burr-brown.com/Products/DataSheets/XTR110.html

Digikey lists the 16 pin plastic dip for $9.60 US in their current catalog
(Q982), page 157.


cheers,

Phil

Philip Starbuck
(909) 792-7917

"There are three principal ways to lose money.  Wine, women, and engineers.
While the first two are more pleasant the third is by far the more certain."
                                               -- Baron Rothschild
                                                       ca. 1860

1998\04\16@113209 by Loferer Klaus

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>                        Use a xtr110 ic
>                        it does everything for you
>                        I forgot who makes them
>                        Justin Grimm    reaperEraseMEspam.....southwest.com.au
>
>
>
>                        Does anyone have info on this chip?
>

XTR110 sounds like Burr-Brown. Have a look at their homepage:
http://www.burr-brown.com


Klaus Loferer

1998\04\16@185948 by TONY NIXON 54964

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[snip]
> Use a xtr110 ic
> it does everything for you
> I forgot who makes them

http://www.burr-brown.com/


Tony


PicNPoke Multimedia 16F84 Beginners PIC Tools.

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1998\04\17@144313 by Dwayne Reid

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Mike Montaigne wrote:
>
>The defacto standard input on Omega & other sensors seems to be
>2-20ma with an internal impedance of about 1K.  Does anyone
>have a simple circuit to convert 0-5 volts from an PIC, or
>0-10 volts from an external A-D on a PC which we are using now
>to this 2-20ma standard?  tks

Uh, I think that should be 4-20 mA, Mike.  Double check your documentation.
As far as a circuit goes, I should be able to dig something up in a day or so.

dwayne

Dwayne Reid   <EraseMEdwaynerspamplanet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, Alberta, CANADA
(403) 489-3199 voice     (403) 487-6397 fax

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