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Connecting a themocouple to PID controller

Discussion in 'General Electronics Discussion' started by Blackcherry, Jun 13, 2013.

  1. Blackcherry

    Blackcherry

    1
    0
    Jun 13, 2013
    Hi everybody,

    I am trying to build a PID temperature controller. I have the thermocouple Amico PT 100

    http://www.amazon.com/gp/product/B008BXECN4/ref=oh_details_o05_s00_i00?ie=UTF8&psc=1

    and the PID controller

    http://www.amazon.com/gp/product/B002PIM3R8/ref=oh_details_o06_s00_i00?ie=UTF8&psc=1

    [​IMG]

    My question is how to connect these two. This thermocouple has 3 wires, red, blue, and yellow. I think that yellow=plus, red=minus, but wtf is the blue one? The terminals 9 and 10 on the controller (see the pic) are denoted "Thermocouple + and -" and there is one more, number 8, which is connected to 9 via resistor. It is clear that "yellow" goes to "9" and "red" to "10,", but what to do with "8" and "blue"? I am tempted to just connect them and see what happens, but have not done that.

    Any advice?
     

    Attached Files:

    Last edited by a moderator: Jun 14, 2013
  2. davenn

    davenn Moderator

    13,343
    1,774
    Sep 5, 2009
    hi there,
    welcome to the forums

    OK the logical thing is that term 8 goes to the sensor output wire

    BUT before you connect anything you must identify the colours on the probe correctly else it may have a VERY short life

    That resistor shown on the back of the controller will most likely be denoting the actualy thermocouple within the probe

    cheers
    Dave
     
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