by Gerry » Thu Mar 30, 2017 12:03 pm
Hi TecManager,
If you separate the wires at the tip of a thermocouple and then independently apply them to a surface for measurement then any difference in temperature between the tips will create a measurement error.
High temperature solder or spot welding should be done so the material surrounding the thermocouple junction, and holding it to the surface, is minimal, to minimize it's thermal mass, and maintain a fast response. However, if the surface being measured has a relatively large area, and is a fairly uniform temperature surface during measurement, this is not such an issue. Bear in mind that, although these are good methods of fixing and providing a high thermally conductive connection between the thermocouple tip and surface to be measured, they could also lead to very noisy measurements depending upon the setup and environment (which means that, if you can't utilize other methods to minimize the noise, you will need another method to attach the thermocouples).
Regards,
Gerry
Gerry
Technical Specialist