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  1. #14
    Join Date
    May 2002
    Location
    Baton Rouge, Louisiana
    Posts
    3,871
    Originally posted by lonboy
    Let's see.... PID is an acronym for Perplexing, Intimidating, and Difficult. In most cases if you leave off the D it works pretty well.....
    Now that we have that cleared up, what do you want to drive from the CV output, what and where is your PV input, and how are you adusting the SP?

    -Lb
    No PID stands for Pretty Intense Destruction
    Quote Originally Posted by MatrixTransform View Post
    very soon it is you that will be pwned

  2. #15
    Join Date
    May 2002
    Posts
    9,564
    Originally posted by joey791
    Originally posted by lonboy
    Let's see.... PID is an acronym for Perplexing, Intimidating, and Difficult. In most cases if you leave off the D it works pretty well.....
    Now that we have that cleared up, what do you want to drive from the CV output, what and where is your PV input, and how are you adusting the SP?

    -Lb
    No PID stands for Pretty Intense Destruction
    -See tmk wouldn't it have been easier to read that little Honeywell manual instead of attempting the easy way out?

    Lonboy, Joey, etc... You guys are really coming through... Thanks!

  3. #16
    Join Date
    Jul 2002
    Location
    NorthEast
    Posts
    811
    4 to 20 ma is immune to electrical noise and
    long wire runs that cause voltage drops
    You can convert it to voltage
    the same way the fire detection systems with smoke heads do
    place a resistor accross the line and read the voltage
    Yes 10 Volts D.C is much easier to read

  4. #17
    Join Date
    Aug 2004
    Posts
    5

    4-20madc vs 0-10vdc

    I thought I would throw my 2 cents into this.

    The main reason to use 4-20 madc loops is that current is common in series. A current loop holds it's accuracy over long distances, where the voltage drops on long wire runs. This is why the chemical/oil/instrumentation business has been standardized on 4-20madc (and occasionally 10-50madc) loops for over 30 years.

    For those who want to trouble shoot in voltage, you can use a 250 ohm resistor in series with a 4-20madc loop and measure 1-5vdc across it to get scale readings. Most receiving instruments (devices that receive the 4-20madc signal) have shunts built into their electronics, so sometimes it is possible to measure at the terminals of the device and see a scaled voltage signal.

    FWIW

  5. #18
    tmk is offline Professional Member TMBM bad email address
    Join Date
    Dec 2004
    Posts
    70
    Hey Thanks alot fellas!! You've been very helpful.

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