NeSSI - Enabled SensorTesting System (SeTS)

1. NeSSI - Enabled SensorTesting System (SeTS) Cornelius H. Brons Mark Disko Andrew Riley Manuel Francisco CPAC Meeting November 9, 2006

2. Objectives • Primary Objective • Vapor phase detection of benzene of at low concentrations in the • presence of toluene and xylenes (e.g. <1 ppm benzene, 100 ppm toluene) • Drivers • Determining toxicological properties for trace exposures mixtures. • Improve industrial hygiene monitoring for S/H/E • Detection Methods • Testing portable sensors capable of sensing < 100ppm benzene in • nitrogen / hydrocarbon stream containing 100X toluene or • xylene • Vapochromics Micro - Analytics • Mid – IR Sensing Arrays • How • Development of an automated Sensor Testing System ( SeTS ) utilizing the NeSSI bus platform November 2006 CPAC Meeting – Seattle, WA

3. Sensor Testing System ( SeTS ) Sampling 4 Ports Gas Mixing November 2006 CPAC Meeting – Seattle, WA

4. SeTS: NeSSI-Enabled Gas Sampling H.P. N2 Line ( 150 psi ) To mix with BTX for dilution and flushing system Static Gas Mixer (1/4” SS) Oxygen Sensor (GE) Moisture Analyzer (GE) ( measures dew/ frost points over a range of -110 to +60 C) (-166 to +140 F ) • 4 Rails ( NeSSI Stick ) Contain components to analyze gas mixtures • Mass Flow Controllers Control gas flows (0-1liter/min), (0-100sccm), ( 0-10sccm), (0-2sccm) • Temperature Probes • Sensor Ports • ppm – level mixture of gases vented in hood November 2006 CPAC Meeting – Seattle, WA

5. Gas Chromatograph With SeTS Unit Inlet Gas Sample Lines From the Valco Set Up To G.C. Inlet Carrier Gas Lines To G.C. SeTS Unit Hewlett Packard 5890 Gas Chromatograph • Gas Chromatograph has a Borosilica Packed Capillary Column • Helium, Hydrogen, Nitrogen and Air Gas Carriers With Samples • Automated Analysis With Lab View Software • G.C. Verifies Gas / Mixture Concentration Levels November 2006 CPAC Meeting – Seattle, WA

6. SeTS Unit With Hollow Wave Guide Mid IR SeTS Unit Gas (B,T,X) Manifold Sample Gas Lines To G.C. From Valco NeSSI Platform Mid Hollow Wave Guide IR Dr. Boris Miziakoff, Christina Young (Ga. Tech.) November 2006 CPAC Meeting – Seattle, WA

7. Waveguide-Enhanced Mid-IR BTX with SeTS Benzene with 200 ppm toluene, 10 – 30 ppm benzene, automated mixing toluene @ 727 cm-1 toluene @ 690cm-1 benzene @ 673cm-1 10 ppm 15 ppm 20 ppm 25 ppm Absorbance 30 ppm Wavelength (cm-1) • Absorbance spectrum show detection of volatile organic gases (benzene with toluene ) • Mid IR / active material ( Ag / AgI ) coated broad band hollow waveguide Christina Young & Boris Mizaikoff Ga. Tech November 2006 CPAC Meeting - Seattle, WA

8. Summary and Future Plans • SeTS Unit Completed and Operational • Experimentation With BTX Started With Encouraging Results • Develop Enhanced Analytical Capabilities To Use With NeSSI In Place • Micro Cantilevers • Mid – IR • Gas Chromatograph (GC) • What’s Next With Vapochromics.......... • Ocean Optics Probe to Analyze Compounds with BTX • ( Dave Veltkamp) November 2006 CPAC Meeting – Seattle, WA

9. Vapochromic Probe Design & Sensing System GAS FLOW Vapochromic Film ProbeTip Dual Fiber Probe Excitation Fiber Light Source Blue LED Spectrograph & Detector Collection Fiber

10. Vapochromic SensorCompounds Compounds with poorly packed lattice allow analyte to enter crystal lattice reversibly Compounds possess an intensely absorbing/ emitting UV-VIS-NIR chromophore that is solvatochromic Chromophore shifts reversibly when analyte enters the lattice cis-Pt(CN-p-(C2H5)-C6H4)2(CN)2 PtPt distance changes when analyte enters crystal

11. Acknowledgements • Dr. Boris Mizaikoff / Christina Young ( G.I.T. ) • (Mid – IR Hollow Wave Guide Data ) • Dr. David Veltkamp ( CPAC / University of Washington ) • ( Vapochromics Set Up & Sensor Material )