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© 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