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OCR: Telewindows Column diagnostics based on pressure variation Faults: [X] Low sorbant porosity Rum batch pressure bias -150.0 150.0 -3.0 Unmodeled Pressure [Based on sensor validation model) Variation Fuzzy Evidence Protein Combination Column sorbent problem Resolution Variation High pressure- 2 1015 unknown cause Hi Pressure Plugged column inlet ox Pressure D Operator Query Severe Hi Pressure Sensor biased high Bypass Column Stop Pump EMERGENCY SHUTDOWN Figure 9. Fuzzy logic network for root-cause diagnosis of high col- umn pressure.