Class II Division 2 Occupancy Sensors Presented on October 15, 2012 - PowerPoint PPT Presentation

Class II Division 2 Occupancy Sensors Presented on October 15, 2012 by: James Fisher Michael Gazda Russell Gee JoAnne Hitchcock Gledi Progonati Christopher Zannoni ECE Senior Design 2012-2013

Team Members Advisors • Chris Zannoni (ECE, CompE) • Dr. George Lykotrafitis (ME) • Gledi Progonati (ECE) • Dr. Sung Yeul Park (ECE) • JoAnne Hitchcock (ECE) • Sponsered By Sensor Switch • Russell Gee (Eng Phys) • James Fisher (ME) • Michael Gazda (ME) ECE Senior Design 2012-2013

Agenda 1. Occupancy Sensor Technology 2. Hazardous Environment Classification 3. Design Considerations 4. Budget 5. Timeline ECE Senior Design 2012-2013

What are Occupancy Sensors? ECE Senior Design 2012-2013

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 ECE Senior Design 2012-2013

Occupancy Sensor Technology Sensor Power (Low Voltage<200 mW) Relay and Line Power Supply Voltage for Sensor Control Signal Sensor Manual Switch Luminaire ECE Senior Design 2012-2013

Why use Occupancy Sensors? Energy Savings Electricity Bill Savings Convenience ECE Senior Design 2012-2013

Hazardous Environments Class I II Div 1 Gas frequently present Dust frequently present 2 Gas present abnormally Dust present abnormally ECE Senior Design 2012-2013

Groups of Hazardous Dusts Group E : Metal dusts (conductive, and explosive) (resistivity <100 k Ω /cm) Aluminum Calcium Silicide Titanium ECE Senior Design 2012-2013

Groups of Hazardous Dusts Group F : Carbon dusts (some are conductive, and all are explosive) (100 k Ω /cm < resistivity <100 M Ω /cm) Carbon Black Charcoal (Activated) Asphalt ECE Senior Design 2012-2013

Groups of Hazardous Dusts Group G : Flour, starch, grain, combustible plastic or chemical dust (explosive) (resistivity >100 k Ω /cm) Flour Grain (Dust Cloud) Cinnamon ECE Senior Design 2012-2013

Design Restrictions: Inherent Safety • Intrinsic Safety limits energy in device, removing possibility of ignition • Cheap • Lower installation cost • Universally accepted • What makes a circuit intrinsically safe? ECE Senior Design 2012-2013

Intrinsic Safety • Composed of Simple apparatues • Passive components that store no, or little energy • Ignition curves • Temperature limitations • Energy limiting barrier (Zener Barrier) ECE Senior Design 2012-2013

Ignition Curves for Resistive Circuits ECE Senior Design 2012-2013

Ignition Curves for Capacitive Circuits ECE Senior Design 2012-2013

Ignition Curves for Inductive Circuits ECE Senior Design 2012-2013

Temperature Regulations ECE Senior Design 2012-2013

Electrical Barriers Relay and Line Power Supply Voltage for Sensor Sensor Zener diode barrier Manual Switch Luminaire ECE Senior Design 2012-2013

Enclosure Considerations Dust ignition proof: o OSHA (Occupational Safety & Health Administration) standard o “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) ECE Senior Design 2012-2013

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 ECE Senior Design 2012-2013 20

Enclosure Considerations List of Class II, Division 2 dusts with the lowest • ignition temperatures Class II Div. 2 Combustible Min. Ignition Temp. Group Dusts (°C) Sevin G 140 Ferbam G 150 Violet 200 Dye G 175 Soy Flour G 190 Sulfur G 220 ECE Senior Design 2012-2013 21

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 ECE Senior Design 2012-2013

Budget $9-11k for M.E. $1k for ECE Wireless Relays, $2 Barriers, $30 • 3D printing Modules, $20 • Barriers (Phy,Elec.) Connectors, $10 • Relays • Communication Modules 3D Printing, PCB Printing, $75 $75 • Connectors/Receptacles • Production PCB's • Testing ? (Could be large amount) • Documentation (Manuals, Codes) Code Books, $170 ECE Senior Design 2012-2013

Timeline ECE Senior Design 2012-2013

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

Questions? ECE Senior Design 2012-2013

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