This will provide a profile that will be very close to actual production conditions and allow you to develop more efficient production recipes. We recommend using a fully populated board for thermal profiling whenever possible. TC wires can be made from 1′ to 9′ (.3-3 meters) long. The TC Harness eliminates the possibility of plugging thermocouples into the wrong numbered connector.įigure 2: TC harness, available in 9 and 12-channels. If you are attaching 6 thermocouples or more, you may want to use a “TC Harness” with 9 or 12 thermocouples in one connector (see fig. Common, single color, 36 AWG, lower temperature insulation thermocouples can be used, but will often provide sporadic results. These TCs are 30 AWG, have a thick coating of FPA Teflon insulation (260☌), and are colored to reduce the chance of confusing TC locations on the board with the TC number (see fig. KIC sells thermocouples specifically designed for solder reflow and wave solder applications. Required tools and materials are: 10-88-2 high temperature solder, a soldering iron rated above 300☌, a solder wick, and the appropriate thermocouples (TC’s). To complete the operations described in this paper you need to know how to use a soldering iron and solder wick. 10-88-2 solder also creates a solid thermal connection between the TC bead and the temperature measurement point. We recommend 10-88-2 solder for TC attachment because it does not start melting until 268☌, which is above the temperatures the board will see during the reflow process. This Applications Note covers the attachment of thermocouple (TC) wires to a PCB for part profiling using high temperature solder.
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