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I am designing a product that uses a thermocouple to monitor temperature.

I am trying to decide what is the best way for users to attach the thermocouple to the PCB. I have found the connectors that Omega Engineering offers. The only problem is that they are a little pricey and hard to find through any of the typical component distributors (except Newark).

Does anyone know of any other standard thermocouple connectors? Do you think it would be bad to use a different style connector like an audio connector for example?

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  • \$\begingroup\$ What's wrong with screw terminals? \$\endgroup\$ – Ignacio Vazquez-Abrams Jul 4 '13 at 1:12
  • \$\begingroup\$ @IgnacioVazquez-Abrams Screw terminals could work for non-connectorized thermocouple. There also are industry-standard 2-prong thermocouple connectors. \$\endgroup\$ – Nick Alexeev Jul 4 '13 at 1:15
  • \$\begingroup\$ @PICyourBrain What temperature measurement accuracy are you trying to achieve? \$\endgroup\$ – Nick Alexeev Jul 4 '13 at 1:16
  • \$\begingroup\$ Within a degree is probably fine \$\endgroup\$ – PICyourBrain Jul 4 '13 at 4:24
  • \$\begingroup\$ J type Thermocouples are typically +/- 1.5C for Class 1. It depends on the Type K,T,J etc. and Class 1 or Class 2. J type Class 2 is +/- 2.5C. \$\endgroup\$ – Spoon Jul 4 '13 at 11:20
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the thing to consider with thermocouple interconnections is that each additional disparate metal type junction you include in the circuit may introduce error.

while looking for PCB connector options like you were, I came across this thread, which describes, for example, the benefit of K-type over J-type when connecting to copper PCB traces. have a read: http://www.nerdkits.com/forum/thread/2779/

any given connector you consider will have some combination of metals, & not just the core metal, but also the plating, if any (gold, tin, etc).

i also stumbled across these people selling PCB-mounting thermocouple connectors, with varieties for each thermocouple type: https://www.labfacility.com/pcb-mounting-thermocouple-socket-iec-p168-pg71/

Anthony.

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