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Simple Water temp circuit?

Discussion in 'Electronic Repair' started by Gary L. Woodruff, Jun 18, 2009.

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  1. Howdy all, I have an old mac-jac water temperature finder that is not
    working. It has a sealed meter that has three connections for the
    thermocouple? wire (approx 200' of it). The thermocouple is connected
    between gnd and one side of the meter. the other side of the meter has a
    9v battery in series with a momentary switch. It also has two wires
    that come out to a pot. There is nothing on the other end of the
    thermocouple wire but it is two different metals. I have tried creating
    a junction at the tip and get full deflection when the circuit is
    engaged. The pot will allow some adjustment but not to below 80f
    degrees. Any ideas as to what I am missing to make this work?
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