Redundant Probe System (P/N 13362)
SSi's Model 9100 Redundant Probe System (RPS) includes:
- The Model 9100,
- A 24 VDC power supply,
- Two 24 VDC relays are mounted and wired on a piece of DIN rail for easy mounting by the customer,
- The 2-line operator interface, and
- The cable connecting the operator interface to the Model 9100-RPS.
Also shown above are the SSi Gold Probe and SSi's 2-probe Reference Air / Burnoff System (P/N 13039.1)
Function:
The Model 9100-RPS reads the signal from two oxygen probes located in the same furnace automatically switching the output from the Model 9100 RPS to the probe with the highest millivolt output. It sends that probe's output to the existing carbon controller to control the enriching gas being added to the furnace.
The probe millivolt "deviation band" and the "alarm delay" time is set using the operator interface. When connected per the electrical drawing, the Model 9100-RPS selects the probe with the highest millivolt output and sends that signal to the controller. As time passes and the other probes millivolt output becomes greater (dependent on the deviation band), the Model 9110 RPS will switch the output from one probe to the other and send the "new" higher millivolt signal to the carbon controller.
The " asterisks (*) " on the operator interface display indicates which probe's millivolts is being used by the furnace atmosphere controller. When the Model 9100-RPS switches the output from one probe to the other it indicates a "deviation band" alarm condition, flashing an "A" on the operator interface. The "A" continues to flash until the probe's output is back within the "deviation band".
The operator can manually select the probe that he wishes to be used in the carbon calculation. If this feature is used the 9100 RPS will use the operator selected probe, and NOT switch from one probe to the other automatically.