“Smart” Sensors

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 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

Example Applications Measurement Validation Adaptive Sensor Auto Calibration Maintenance

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

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

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