thermocouple ktype clamps interfering

Discussion in 'The Projects Forum' started by jerryls, Feb 25, 2014.

  1. jerryls

    Thread Starter New Member

    Feb 25, 2014
    I have a circuit board i designed that has input for two clamp type thermoucouples. Each circuit is connected to an instrumentation amp (INA126). They both work fine individually, but when two are used and both clamps are connected to the same pipe thay read incorrectly. The problem stems from the fact that the clamp type thermocouples have a metal conductor for thermal conductivity directly connected the thermocouple junction. Both low sides of the cold junction(connection at the board) are connected to each other. Has anyone run into this and have a solution?
  2. alfacliff

    Well-Known Member

    Dec 13, 2013
    insulate the clamps.