Thermocouple Type: J. Nominal Temperature Range: 0?é?? to 485?é?? ?é??C, 32?é?? to 905?é?? ?é??F. Accuracy: ?é?? 1 ?é??C * Accuracy figure requires use of gain and offset commands.. Over/Under Range Capability: -32?é?? to 1,200?é?? ?é??C, -25?é?? to 2,192?é?? ?é??F. Over/Under Range Accuracy: ?é?? 2 ?é??C. G4 I/O family - The G4AD5 provides a single channel of transformer and optically isolated temperature-to-digital conversion from a Type J thermocouple input. This module also includes complete electrical channel-to-channel isolation, which eliminates troublesome ground loop problems.. Opto 22. Opto 22. G4AD5.