Class II Division 2 Occupancy Sensors

Transcription

1 Class II Division 2 Occupancy Sensors Presented on October 15, 2012 by: James Fisher Michael Gazda Russell Gee JoAnne Hitchcock Gledi Progonati Christopher Zannoni

2 Team Members Advisors Chris Zannoni (ECE, CompE) Gledi Progonati (ECE) JoAnne Hitchcock (ECE) Russell Gee (Eng Phys) Dr. George Lykotrafitis (ME) Dr. Sung Yeul Park (ECE) Sponsered By Sensor Switch James Fisher (ME) Michael Gazda (ME)

3 Agenda 1. Occupancy Sensor Technology 2. Hazardous Environment Classification 3. Design Considerations 4. Budget 5. Timeline

4 What are Occupancy Sensors?

5 Occupancy Sensor Technology PIR-Passive Infrared Cannot "see" through materials, including glass Multiple individual beams look at the area Two (or more) consecutive beams detect a difference in temperature Signal sent to indicate occupancy Microphonics Microphones pick up sound to indicate continued occupancy without movement

6 Occupancy Sensor Technology Line Voltage Relay and Power Supply for Sensor Sensor Power (Low Voltage<200 mw) Control Signal Sensor Manual Switch Luminaire

7 Why use Occupancy Sensors? Energy Savings Electricity Bill Savings Convenience

8 Hazardous Environments Div Class I II 1 Gas frequently present Dust frequently present 2 Gas present abnormally Dust present abnormally

9 Groups of Hazardous Dusts Group E: Metal dusts (conductive, and explosive) (resistivity <100 kω/cm) Aluminum Calcium Silicide Titanium

10 Groups of Hazardous Dusts Group F: Carbon dusts (some are conductive, and all are explosive) (100 kω/cm < resistivity <100 MΩ/cm) Carbon Black Charcoal (Activated) Asphalt

11 Groups of Hazardous Dusts Group G: Flour, starch, grain, combustible plastic or chemical dust (explosive) (resistivity >100 kω/cm) Flour Grain (Dust Cloud) Cinnamon

12 Design Restrictions: Inherent Intrinsic Safety limits energy in device, removing possibility of ignition Cheap Safety Lower installation cost Universally accepted What makes a circuit intrinsically safe?

13 Intrinsic Safety Composed of Simple apparatues Passive components that store no, or little energy Ignition curves Temperature limitations Energy limiting barrier (Zener Barrier)

14 Ignition Curves for Resistive Circuits

15 Ignition Curves for Capacitive Circuits

16 Ignition Curves for Inductive Circuits

17 Temperature Regulations

18 Electrical Barriers Line Voltage Relay and Power Supply for Sensor Zener diode barrier Sensor Manual Switch Luminaire

19 Enclosure Considerations o Dust ignition proof: o OSHA (Occupational Safety & Health Administration) standard The apparatus is enclosed in a manner that will exclude ignitable amounts of dusts and will not permit arcs, sparks or heat generated or liberated inside the enclosures to cause ignition of exterior dust accumulations on the enclosure or of atmospheric dust suspensions in the vicinity of the enclosure. -(National Electric Code)

20 Enclosure Considerations o Enclosure material must meet certain requirements: Corrosion Resistance Wireless communication restriction due to transmissibility of metals Raceways/conduit must be made of metal or PVC and must be sealed Wires must be supported to eliminate tension in wire Low heat transfer, thermal conductivity Crucial to prevent combustion Dust layers/clouds can ignite due to heat transfer from components enclosed in the box

21 Enclosure Considerations List of Class II, Division 2 dusts with the lowest ignition temperatures Class II Div. 2 Combustible Dusts Group Min. Ignition Temp. ( C) Sevin G 140 Ferbam G 150 Violet 200 Dye G 175 Soy Flour G 190 Sulfur G

22 Cost Considerations o Cost (< $430-$1200 based on money saved in 3 years) Cheapest material that meets requirements Material with lowest production cost Injection mold plastics Low installation cost Enclosure design should limit installation time Reduce installation cost Reduce overall cost of final product Low component cost

23 Budget $9-11k for M.E. $1k for ECE Connectors, $10 Wireless Modules, $20 PCB Printing, $75 Relays, $2 Code Books, $170 Barriers, $30 3D Printing, $75 3D printing Barriers (Phy,Elec.) Relays Communication Modules Connectors/Receptacles Production PCB's Testing? (Could be large amount) Documentation (Manuals, Codes)

24 Timeline

25 Please visit our website to follow the project and for more info (link on main ECE senior design page, Team 166)

26 Questions?

27 References "Alma Aquaculture Research Station University of Guelph." Alma Aquaculture Research Station University of Guelph. University of Guelph, Web. 11 Oct < "Aluminium (Powder)." Pyro Aluminum (UK: Aluminium). N.p., n.d. Web. 11 Oct < "Avoiding and Overcoming Installation Problems With Occupancy-Sensing Lighting Control Systems." Rensselaer Polytechnic Institute, 2 Dec Web. 10 Oct < Bower, Lisa. "Baking with Different Types of Flour." Life123. N.p., Web. 11 Oct < "Carbon Black (N220, N660, N550)." Made-in-China.com. N.p., Web. 11 Oct < "Cinnamon Spice." Cinnamon-spice Has Very Unique Healing Abilities You Want to Be Aware Of! Natures Health Foods, n.d. Web. 11 Oct < "Ebay Targets India Growth." HSBC Global Connections, Web. 11 Oct < "Energy Efficiency Outside the Box Construcion." Outside the Box Construction, Web. 13 Oct < "Exposure to Mold and Dust in Grain." Iowa State University Extension and Outreach. Iowa State University, Web. 11 Oct < "Ferro Alloys Product." Metal Alloys (India). N.p., n.d. Web. 11 Oct < "Hazardous (Classified) Locations." Hazardous (Classified) Locations. OSHA, May Web. 10 Oct < "Houston Blogs: TheVote." : The Money Trail #GOP2012: Updated. ABC13, 15 Oct Web. 13 Oct <

28 References "Intrinsic Safety "i" Type of Protection." Siemens, Web. 12 Oct < "Light Guide: Occupant Sensors." Light Guide: Occupant Sensors. Inter.Light, Web. 10 Oct < Lilly, Paul. "Amped Wireless AP20000G Wireless Router Promises Up to 7,500 Square Feet of Coverage." Maximum PC. N.p., 18 Sept Web. 13 Oct < "Lutron MS-OPS2-WH Maestro 250 Watt Single Pole Occupancy Sensor Switch, White. Amazon, Web. 13 Oct < "Maximize Your Energy Savings with a Quality Furnace." American Weathermakers, n.d. Web. 13 Oct < "Precious Metals: Titanium Jewelry." Precious Metals: Titanium Jewelry. All About Gemstones, Web. 11 Oct < "Sensor Switch." Sensor Switch. Acuity Brands, Web. 12 Oct < Stahl, R. "Innovative Global Explosion Protection." Automation Catalog R Stahl, Web. 26 Sept "What You Should Know about Coal Tar Sealant." Springfield News-Leader. Gannett, 6 Feb Web. 11 Oct <