Industrial thermocouple/RTD connectors

[BOPdesigner]

I am looking for an industrial connector that would be suitable to design into a portable temperature datalogger. The single connector needs to accept the main TC types as well as RTD (2 and 3 wire). I am thinking of a circular connector with a field detachable cable option for the plug, but what about CJC? The PCB that the connector receptacle is attached to in the datalogger will be encapsulated in potting material, so having a CJC IC on that board will certainly be reading a different reference temperature then where the actual cold junction occurs which would be just outside the data logger. The datalogger needs to meet IP 67. If you have knowledge of some connector mfgs that might have an offering that would meet these requirements, please let me know.

 

[itsmoked]

That is a tough nut to crack. Mostly I see screw terminals often directly into the circuit board. PEM-Engineering makes threaded press-in nuts specifically for pressing into PCBs. I have used them several times.

Then you heavily surround the terminals with cladding to make them isothermal (a serious requirement!).

In your case I'd then bring the cladding into the potting so that a closely coupled temperature sensor can monitor the cladding and by inference the external screws.

You will also want to insulate the temperature sensor from the other internal components as much as possible. You may need to add insulation between it and other innards, like a dike. You also break the cladding with the inner stuff. You don't want the inner electronics to be cooled via this stuff. That would result in a heat flux.. That would be velly, velly, bad.

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com