Analog Inputs
The Super Systems, Inc. 31631 Analog Board contains a group of five channels isolated from the main DC power source. The board can be connected to thermocouples, voltage sources from 20mV full scale to 1.28 Volts full scale, or 4 – 20 mA current loops. Take caution when using current loops to avoid damaging the input (see 4 – 20 mA Current Loop connections).
Thermocouple wires can be connected directly to the terminal blocks. The thermocouple junctions should not be grounded. If they do touch a ground reference, all thermocouples on a board must have a common ground reference. If multiple thermocouples are connected to different ground reference points, the accuracy of all thermocouples on the board cannot be guaranteed to be accurate.