SSI America 8020 Thermocouple connections, Voltage connections, 20 mA. Current Loop connections

Getting Started

When logging data, the operator will use the on-board display to start and stop the data logging / survey process. The first steps related to data logging are connecting the inputs to the terminal strips on the data logger. Each terminal strip represents a single analog board with 5 inputs. You can remove these terminal strips by pulling up on both ends of the terminal strip.

Depending on the model number, you have either 20 or 40 input channels for data logging. For each channel there will be a positive and negative connection which must be attached to the appropriate input.

The operator defines an input type for each channel. This is performed through menu option 8 (Modify Input Settings) on the data logger.

Once the inputs have been connected, the operator selects which inputs will be included in the survey. This is done in 2 ways. The template provides operators with input selection but can be updated on the data logger using the Select Input Channel option. When a template has been selected, the input channels setup for the template, as defined in the Template Manager, will be the selected channels for

the survey. As mentioned, this can be updated using menu option 7 Select Input Channel. Always select a template prior to running a survey. If you want to create new templates, please see section SDS Template Manager.

Analog Inputs

The Super Systems, Inc. 31541 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.

Thermocouple 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.

Voltage connections

Voltages from 0 mV to 1.28 Volts can be directly connected to the terminal blocks. When measuring ground-referenced voltages, all references must share a common ground reference. If the voltage sources are connected to different ground reference points, the accuracy of all the voltage sources connected to the board need to be checked for accuracy.

4 – 20 mA. Current Loop connections

Before connecting the current loop, insert the shorting jumper on the board for each channel used to measure current loops. This jumper inserts the 62-ohm shunt resistor across the input of the A/D. If multiple current loops are connected to one board, all must share the same power supply and ground reference points or the accuracy of all the current loops need to be checked for accuracy.

Super Systems Inc. Page 7 SDS Data Logger Manual #4565 Rev D