Appendix B: Digital Inputs on the RGA

 

There are four Digital Inputs on the RGA6010.  These are usually tied to external events or activated by an external PLC.  Each one has a different function as described below:

 

• Digital Input #1: Inhibits the COF/PF adjustment.  When this is enabled, no adjustments will be made to the COF/PF.

• Digital Input #2: Turns the sample pump off.  When this is enabled, the sample pump will turn off.  If the pump is already off, then nothing will happen.

• Digital Input #3: Initiates a Zero Calibration.  When this is enabled, the RGA will stop current activities and begin a zero calibration via the Automatic Calibration Ports.

• Digital Input #4: Initiates a Span Calibration.  When this is enabled, the RGA will stop current activities and begin a span calibration via the Automatic Calibration Ports.

 

The digital inputs are enabled by completing the electrical connection between each input and the ground terminal.

 

Example: Assume that you want to turn the pump off at any time the door of the furnace is opened.  You might add some open contacts on the relay that is being used to open the door, so that when that relay is activated, it connects DI#2 to the ground terminal.  As long as the door is being held open, the pump will not turn on.