Atmosphere Probe Diagnostics
Sooting Alarm
By careful analysis of the furnace temperature and carbon potential it is possible to determine when the atmospheric conditions are such that carbon will be deposited as soot on all surfaces inside the furnace, including the workpiece. It is obviously desirable to avoid this situation and in Eurotherm solutions an alarm is pre-configured and can be used to trigger a furnace event.
Eliminating sooting protects the furnace lining, maintains the accuracy of the zirconia probe and stops formation of a soot barrier on the workpiece, which can prevent carbon diffusion.
Automatic Probe Cleaning
A probe clean and recovery strategy can be programmed to occur between batches or manually requested by an operator. A short blast of high flow burn off is used to remove any soot and other particles that may have accumulated on the probe. During the cleaning and recovery cycle the %CP reading is frozen, thereby ensuring continuous furnace operation.
Probe Impedance Monitoring
When the output impedance of a zirconia probe increases above a certain level, it
indicates that the performance of the probe has deteriorated and that it should be replaced. Using a specialist zirconia input module the T2550 PAC controllers have
the ability to measure the impedance of the sensor connected to its input and, in
where the customer is happy with the carbon control system but wishes to provide additional probe diagnostics.
