© Swagelok Company, 2003Rick Ales 8/20/2003

Intrinsic Safety Overview

© Swagelok Company, 2003Rick Ales 8/20/2003

Evolution of NeSSI

Gen IIICirca 200?

Miniature/Modular (enabled by Mechanical Standard)

PnP Smart Devices (enabled by Communication Standard)

Micro Analytical(enabled by Technology Advances)

End UserValue

Gen IICirca 2005

Gen INow

We are Here

By Line(enabled by Intrinsic Safety)

© Swagelok Company, 2003Rick Ales 8/20/2003

Plug-n-Play Top Hat Concept

Presented at IFPAC 2002 by Rob Dubois, Dow Chemical.

© Swagelok Company, 2003Rick Ales 8/20/2003

Hazardous Area Protection Methods

Purge Mount electric devices in a cabinet to keep explosive atmosphere out.

Explosion Proof Mount electric devices in a cabinet to keep explosion in.

Intrinsic Safety Prevent the explosion ignition by limiting electrical energy.

© Swagelok Company, 2003Rick Ales 8/20/2003

FISCO Power Budget

• Fieldbus Intrinsically Safe COncept model• Developed by PTB1 in Braunschweig, Germany • Doubles the number of devices per segment.

1. Physikalisch-Technische Bundesanstalt (PTB), http://www.ptb.de/en/index.html Johannsmeyer, "Investigation into the intrinsic safety of fieldbus systems (FISCO)". PTB, report W53, ISBN 3-89429-310-1.Physikalische Technische Bundesanstalt, "Investigations into the intrinsic safety of fieldbus systems". PTB 1994, ISBN 3-89429-512-0

Max Voltage 17.8 Vdc

Max Current IIC Group Gas 183 ma @ 14 Vdc

Max Current IIB Group Gas 380 ma @ 14 Vdc

Max Power 5.24 W

Max Co / Lo 5 nF / 10 uH per Device

© Swagelok Company, 2003Rick Ales 8/20/2003

NeSSI Architecture

Information - Level 2 LAN (Ethernet)

OPCGateway Control RoomField - Level 1 LAN (EtherNet)

By-LineSample Point

Class 1 Zone 0/1

WirelessHandheld

HMI

Field

Circuit 1

Enclosure Class 1 Zone 2

IS B

arrier

24 VDC

Sensor - Level 0 LAN DeviceNet <250 ft @14VDC

V TPA

NeSSI Device Sample System

GasAnalyzerLogical

Segment

Circuit 2

Circuit 0

CAN Master

SensorActuatorManager