class ii division 2 occupancy sensor -...

Class II Division 2 Occupancy SensorClass II Division 2 Occupancy Sensor

James FisherJames Fisher

Michael GazdaMichael Gazda

Presented on November 28, 2012 by:Presented on November 28, 2012 by:

Michael GazdaMichael Gazda

Russell GeeRussell Gee

JoAnne HitchcockJoAnne Hitchcock

Gledi ProgonatiGledi Progonati

Christopher ZannoniChristopher Zannoni

Dr. Sung Yeul Park (ECE) Dr. George Lykotrafitis (ME)Dr. Sung Yeul Park (ECE) Dr. George Lykotrafitis (ME)

Senior Design 2012Senior Design 2012--20132013

AgendaAgenda Background

Initial Design Approaches

Meeting Outcomes

FM Approvals

Sensor Switch Sensor Switch

Final Design Approaches

Plan for next semester

Testing of design

Gantt chart and team member roles

ECE Senior Design 2012ECE Senior Design 2012--20132013

Background

What are occupancy sensors?

Why?


Occupancy Sensor Technology

Relay and

Power Supply

for SensorSensor

Line

Voltage

Sensor Power

(Low Voltage

Class 2 Division II Safety

This device must work in a Class 2 Div. II environment Metal dusts, carbon dusts, flour and grain dusts abnormally present

Warehouses/Storage areas Warehouses/Storage areas

Intrinsic Safety Limits energy in device, removing possibility of ignition

Composed of passive components that store little or no energy

Temperature limitations


Initial Design Approaches Using original requirements


Both Sensor and Relay Enclosed

Relay and

Power Supply

for Sensor

Control

Line

VoltagePower to

Luminary

Dust-Tight Conduit

Sensor

Dust-Tight Enclosure

Window made out of IR transmissible material

Sensor

Power

Control

Signal


Wired Solution with Connector (Assumes IS sensor)


Wireless Solution(Assumes IS sensor)


Research=More Questions

Our research led to many unanswered questions about requirements What are the testing methods?

Which, of the many, requirements are relevant to our project?our project?

What are the component and design restrictions?

We contacted a NRTL FM Approvals offered to help

Answered many questions

Provided expert opinions

Helped finalize our approach


FM Approvals Background

OSHA approved testing/certification company Parent company: FM Global

In business since 1835

Make the regulations that drive industry Make the regulations that drive industry standards

Acts as disinterested, 3rd party observer where design process is concerned

Qualified to test for IS (intrinsic safety), dust-ignition proof, explosion-proof, etc.

11ECE Senior Design 2012ECE Senior Design 2012--20132013

FM Approvals Meeting

Explained the testing process:

Duration

Approach

Various tests depending on desired Various tests depending on desired certification:

Crush, exclusion (purge/pressurize), flammability, rigidity, torque, mould stress, hot and cold impact, intrinsic safety

Will be explained later in presentation

General requirements to pass tests



We explained the initial designs Received feedback

What would/wouldnt pass testing

Discussed possible solutions and provided specs.specs. Enclose the sensor using dust ignition proof standard

Or make sensor intrinsically safe using provided standard

Changes needed from initial product to completed, passable design


Sensor Switch Meeting

Gave us two options

Enclose the sensor

Find a 1mm thick Fresnel lens for PIR sensor window

Make sensor intrinsically safe

Professor Park advised us to do this option


Design Process

Brainstorm

Evaluate

Advisement

Sensor Switch Meeting Sensor Switch Meeting


Advisors Recommendation

Finalize

Create


Final Design Approach

Dust-ignition proof box enclosing relay according to the FM3616 standard


Intrinsically safe sensor according toFM3610 which refers you to ANSI/ISA60079-0 and ANSI/ISA60079-11 standards

Dust Circulation Testing

We will build an apparatus to determine whether the enclosure is dust tight.is dust tight.

Create vacuum within enclosure

Circulate talcum powder within chamber


Impact Testing

2.7 J impact test for Class II

1kg test mass, falling from height 270mm

Steel hemisphere 25mm diameter as Steel hemisphere 25mm diameter as impact point

Unit assembled, mounted on concrete with mass over 20kg

(Drop test not necessary- not portable)


Thermal Endurance

Non-metallic elements which dust-protection is dependent must undergo thermal endurance testing

Heat: 4 weeks at (905)% humidity, Heat: 4 weeks at (905)% humidity, (202)K above maximum service temperature

Cold: 24hr, 5 to 10K below minimum service temperature


Circuit Design and Testing

Determine how circuit works

Recently acquired blueprints

Work with Sensor Switch engineers

Analyze components for IS Analyze components for IS

Redesign

PSpice analysis

PCB Design and Prototype

Practical tests


Timeline-Past

Initial Hazardous Environment Research-found required specsMeeting with Sponsor (9/19)Requested BlueprintsWebsite DesignProject Statement

September

Projects specificationsWebsite finishedNEC research 1500p doc

October

21

NEC research 1500p docFound 12 specs relating to projectContacted FM ApprovalsEnclosure designProject specs redefinedSetup meeting with FM approvalsWireless and Wired research

Final Written ProposalFM Approvals meeting Project redefinedSensor Switch meetingProject RedefinedTest equipment researchedBlueprints received Final Presentation

November

Timeline-FutureDecember January Febuary March April

Wk

1

Wk

2

Wk

3

Wk

4

Wk

1

Wk

2

Wk

3

Wk

4

Wk

1

Wk

2

Wk

3

Wk

4

Wk

1

Wk

2

Wk

3

Wk

4

Wk

1

Wk

2

Wk

3

Wk

4

Figure out circuit

w/SS Winter Break

Initial Enclosure

Design

Finalize Enclosure

design

22

Build Test

Equipment

Analyze

components for IS

Redesign Circuit

Prototype Circuit

PCB design

Test Circuit

Test Enclosure

Individual Tasks & Roles

Russell Design and Build Test Equipment

Gledi PCB Design and Help with Test Equipment

JoAnne JoAnne Circuit Design and Circuit Testing

Mike & James Designing, Prototyping, Testing of Relay

Enclosure

Chris Team Management and Circuit Testing


Budget

Complexity of regulations hindered design progress.

$13,000Cost of Project

design progress.

Impractical to make a detailed budget in 12 hours.

However most money spent will go towards testing equipment.

24

Questions?Questions?Questions?Questions?


class ii division 2 occupancy sensor -...

Documents