ndzied1
Lifetime Supporting Member
Hi All,
We are building a box for a customer that has several Type J thermocouples entering the box that need to be able to be connected and disconnected depending on a test setup. These eventually end up at a National Instruments 9213 Card
They have asked us to use a spring pin connector on the box to get the wire through the wall because they have used them before. This is a nickle plated brass part and not made for T/C use. It would look something like this.
I suggested we use a T/C connector and T/C wire all the way to the input card like this:
They are saying the card should be able to compensate for the extra cold junctions in the spring clips. I have been trying to read tons of stuff on this and still can't convince myself one way or the other . Maybe the "Thermocouple Law of Intermediate Metals" means that they are OK using these???
If I use the spring pins, what wire should go between the clips and the T/C card?
Any help or suggestions appreciated.
Thanks, Norm
We are building a box for a customer that has several Type J thermocouples entering the box that need to be able to be connected and disconnected depending on a test setup. These eventually end up at a National Instruments 9213 Card
They have asked us to use a spring pin connector on the box to get the wire through the wall because they have used them before. This is a nickle plated brass part and not made for T/C use. It would look something like this.
I suggested we use a T/C connector and T/C wire all the way to the input card like this:
They are saying the card should be able to compensate for the extra cold junctions in the spring clips. I have been trying to read tons of stuff on this and still can't convince myself one way or the other . Maybe the "Thermocouple Law of Intermediate Metals" means that they are OK using these???
If I use the spring pins, what wire should go between the clips and the T/C card?
Any help or suggestions appreciated.
Thanks, Norm