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“Smart” Sensors

“Smart” Sensors. william.b.dodge@usa.dupont.com. DIRTFT Do It Right The First Time. Concept: All parameters needed for measurement and validation are “local” to the sensor Sensor sends only high quality data to DCS for process control. Hardware. UOP Guided Wave 300P Spectrometers

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“Smart” Sensors

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  1. “Smart” Sensors william.b.dodge@usa.dupont.com

  2. DIRTFTDo It Right The First Time • Concept: • All parameters needed for measurement and validation are “local” to the sensor • Sensor sends only high quality data to DCS for process control

  3. Hardware • UOP Guided Wave 300P Spectrometers • Multiplexed applications • ~200 analyzer years experience • Bi-directional MODBUS link to DCS • Analyzer returns MEASUREMENT and STATUS value for control action • DCS sends commands and key process parameters

  4. Example Applications • Measurement Validation • Adaptive Sensor • Auto Calibration Maintenance

  5. Measurement Validation • Sensor validates EACH measurement by combining: • Calibration Model Statistics • Outlier detection, fit parameters . . . • Hardware parameters • System voltages, scan time, detector noise . . . • Process (environmental) Data • Pressures, temperatures, flows . . . Measurement status basis for DCS control

  6. Adaptive Sensors • Product TYPE Sets: • Measurement parameters • Calibration equation (model) • Process STATE Sets: • Instrument response (“Auto” cruse control) • Rapid process change = short time constant • Stead state=long time constant

  7. Auto Calibration • DCS signal triggers raw data save when: • Routine samples pulled for lab analysis (low frequency activity) • Non-standard conditions exist • DCS initiates calibration update based on: • Lab data • Corresponding instrument data

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