|SSi's Model 9120 Redundant Probe System - Color (RPS-C)
- Data logging using
operator interface memory card
- Operator interface
trend line display
- Indication showing
which probe is being used for the % C calculation
- Allows customer
selection of probe "A" or "B", or automatic selection
The two (2) SSi
Gold Probes shown in the picture (below) MUST BE ordered
RPS - C with Dual Reference - Purge Air System
Model 4500 | P/N 13493
Model 9120 Redundant Probe System (RPS) includes:|
- The Model 9120
- A 24 VDC power
- Two - 24 VDC
relays are mounted and wired on a piece of DIN rail for easy
mounting by the customer
- The 2-line
- The cable
connecting the operator interface to the Model 9120-RPS
The two (2) SSi
Gold Probes shown in the picture MUST BE ordered separately
9120-RPS reads the signal from two oxygen probes located in the same
furnace automatically switching the output from the Model 9120 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 9120-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 9120 RPS
will switch the output from one probe to the other and send the "new"
higher millivolt signal to the carbon controller.
asterisks (*) " on the operator interface display indicates which
probe's millivolts is being used by the furnace atmosphere controller.
When the Model 9120-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".
operator can manually select the probe that he wishes to be used in
the carbon calculation. If this feature is used the 9120 RPS will use
the operator selected probe, and NOT switch from one probe to the