Is there really one reference junction, though? I am under the impression that any joint of dis-similar metals in the thermocouple circuit will cause a voltage difference which is temperature dependent. This includes even things like bond wire connections inside the IC used to read the thermocouple. So, I'm not sure that it makes sense to couple the cold junction sensor so closely with the TC connector unless you are also coupling it closely with the rest of the electronics in the circuit which reads the TC. I am speaking as a heavy user of TCs who has never designed a circuit to interface with them so perhaps someone with more experience here can chime in. Sean On Tue, Dec 7, 2010 at 8:29 AM, PICdude wrote: > Same-ish here. =A0I use regular screw-terminal blocks for this, and > ensure that the reference junction is inside the enclosure, with the > temp sensor next to the terminal block, on the side the wires connect > to. > > Cheers, > -Neil. > > > > Quoting peter green : > >> Do you actually need a special thermocouple connector? Last time I >> needed to hook up a thermocouple I just used an ordinary micro spox. >> >> Afaict all you achive by using a special connector is moving the >> reference junction from the cable-connector interface to the >> connector-pcb interface. That gets the reference junction slightly >> closer to whatever temp sensor you are using as a reference but I doubt >> it will make much difference in practice. >> > > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .