Any reason one thermocouple can't or shouldn't be connected to two inputs on a NI9213?
More info: I want to add an additional layer of over temp shut down ability.
N9213 is monitoring two heaters, via thermocouple. Heaters are individually controlled with Relays.
I want to have a third relay and fourth relay with normally closed contacts in series with the AC power to the heater.
These 3rd and 4th relays will open if the heaters go over temperature, in such case the heaters relays weld shut.
the desire is to have the 3rd and 4th relays controlled by the same thermocouples that do the temperature control.
This would require that one thermocouple be connected to more than one input of the NI9213.
Can that be done?
Go ahead and tell me there is an easier way to do this.
But there is an interoffice argument about whether you can connect one thermocouple to two inputs of a NI9213.
I think you can, but if you can't, I'd like to know why.
Thanks all, Mavam