Thermocouple Termination Unit.
The Bailey Controls NTU-7A0 (now part of ABB) is a legacy Thermocouple Termination Unit used in the Bailey INFI 90 and NETWORK 90 distributed control systems. It is an 8-channel input board (25A, 24VDC, -100/100mV) designed to process and connect thermocouple signals in heavy-duty industrial environments.