×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Dear All Anybody know some isolato

Dear All Anybody know some isolato

Dear All Anybody know some isolato

(OP)
Dear All
Anybody know some isolator to convert a 4 wire instruments(input) to 2 wire instrument(output).
Thanks in advance
Ricardo Almarza
ricardo.almarza@promon.com.br

RE: Dear All Anybody know some isolato

Sound like you’re to convert a powered device to a loop powered device. That’s not easy, because most 4 wire device are that way due to power consumption. So if you device used 50ma at 24vdc to power up your loop would require a 300vdc power source at 4ma on the loop side.

If you got stuck replacing an old 2-wire device with a new 4-wire device and only have a 2-wire cable in place then your SOL. However if you have a shield in that cable and don't mind the possibility of noise interfering with the signal most 4-wire devices can be wired as 3-wire devices.

4-wire
+24vdc-------------------Black
+4-20ma------------------White
-24vdc------|------------Shield
-4-20ma-----|

Hope that's enough Rope....

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources