Thermocouple Scale

[John Parker 0]

I am using a SLC 5/04 with a thermocuple card to read mV from the junction box on a floor scale. I am having trouble maintaining the proper zero after I do a calibration. It seems that the scale floats. I am planning on purchasing and installing a Hardy 1746-WS weigh module but was wondering if anyone has ever succesfully used the thermocouple card method for a scale, and if there are any options other than the Hardy module?

[BobLfoot 302]

We have some Hardy units but a lot more Vishay BLH units. They operate on RIO and offer a local controller for cal and zero. Never tried load cell straight to plc. Let me know if you can make it work.