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Similar to Pepperl fuchs 2011 Emerson Global Users Exchange Intrinsically Safe CHARMS Session 8-2387
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Pepperl fuchs 2011 Emerson Global Users Exchange Intrinsically Safe CHARMS Session 8-2387
- 1. Application of the Intrinsically Safe CHARMS Modules for Project Savings Session ID: 8-2387
- 4. You Are All Familiar With Emerson’s Electronic Marshalling Controllers Various busses Wireless I/O Electronic Marshalling
- 6. Background on Hazardous Locations An area containing (or likely to contain) an ignitable concentration of flammable gas or vapor, where an electrical spark of sufficient power will cause an explosion. HAZARDOUS NOT HAZARDOUS
- 8. Hazardous Locations & Protection – Examples Class I ; Division 1 ; Groups A,B,C,D ; T6 Permitted Class Permitted Division Gas Groups Temperature Class Zone 1 , Ex ib IIB T6 Gas Groups Temperature Class Type(s) of Protection Permitted Zone Defined by FM & ANSI/ISA Defined by IEC & CENELEC Traditionally Zones have been in Europe Traditionally Divisions have been in the US
- 11. Comparison of Protection Methods
- 12. Intrinsic Safety: Basic Concept An intrinsically safe circuit consists of the following: - Intrinsically Safe Equipment - Interconnecting Wire - Associated Apparatus Intrinsically Safe Equipment Associated Apparatus Associated Apparatus
- 18. Intrinsic Safety Applications NOTE: For Hazardous Environment applications, Intrinsic Safety is easier to understand and easier to apply; however, where Intrinsic Safety methods of protection will be applied, be sure that you have the proper experience, and please contact Pepperl+Fuchs or Emerson Intrinsic Safety experts NOTE: Intrinsic Safety training and education is recommended and can be made available to you, please contact Pepperl+Fuchs or Emerson Intrinsic Safety experts
- 24. Intrinsic Safety with Traditional I/O DeltaV M-series DeltaV S-series Via energy limiting devices, IS barriers, that limit energy in the circuit… Adding External IS Isolating Barriers to DeltaV or DeltaV SIS Hazardous Area Hazardous Area
- 25. Intrinsic Safety with Traditional I/O Via energy limiting devices, IS barriers, that limit energy in the circuit… Many wires!! Too much cabinet space DeltaV S-series Hazardous Area
- 26. Intrinsic Safety with Standard CHARMS I/O Via energy limiting devices, IS barriers, that limit energy in the circuit… CHARMS DeltaV S-series External IS Barriers Cables, labels, associated drawings, and installation/checkout in FAT can cost more than DCS I/O channel hardware or an external IS barrier/isolator. Hazardous Area
- 27. Intrinsic Safety with Standard CHARMS I/O Via energy limiting devices, IS barriers, that limit energy in the circuit… CHARMS DeltaV S-series External IS Barriers Cables, labels, associated drawings, and installation/checkout in FAT can cost more than DCS I/O channel hardware or an external IS barrier/isolator. Hazardous Area
- 28. Now IS CHARMs are Available Controllers Various busses Wireless I/O Electronic Marshalling
- 33. IS CHARMS Replace IS Barriers IS CHARMS 120 I/O CONVENTIONAL IS BARRIERS 120 I/O
- 34. Cost Comparison – Business Results Achieved IS CHARMS CONVENTIONAL IS BARRIERS
- 35. Intrinsic Safety with DeltaV SIS I/O DeltaV SIS DeltaV S- or M-series Via energy limiting devices, IS barriers, that limit energy in the circuit… Adding External IS Isolating Barriers to DeltaV or DeltaV SIS BPCS Hazardous Area SIS Hazardous Area
Editor's Notes
- An intrinsically safe apparatus never stands alone. Generally, it is part of a system in which the certified components must be used in a way to guarantee the safety of the system for the specific application. A simplified schematic of an intrinsically safe system is shown here. As can be seen there are three components to an intrinsically safe circuit: - The field device- Intrinsically safe equipment located in the HAZARDOUS LOCATION - Intrinsically safe barrier-or associated apparatus located in NON-HAZARDOUS LOCATION - Interconnecting wire between the two apparatus The example here is simple because the fault combinations are few and the knowledge of the apparatus safety parameters and cable characteristics are sufficient to verify the safety of the system. A more complex system (combinations of barriers or use of multiple cables) requires a more detailed analysis because the fault combinations to be verified are many and not always evident.
- An intrinsically safe circuit will always operate below the minimum ignition point during normal and abnormal operation with a 50% safety factor. The following standards contain ignition curves and design requirements for intrinsically safe equipment: UL913 FM3610 CSA C22.2 No. 157 ISA 12.2.01 IEC 60079-11
- The Zener diode defines the Voc/Uo. There are up to 3 of them in one Barrier. Ex ia requires to be safe even in the event of 2 independent failures. Therefore Ex ia barriers are equipped with 3 parallel connected Zener diodes. Ex ib requires to be safe even in the event of one failure so minimum requriement is 2 Zener diodes and Zone 2 requires to be safe under normal operation condition only (no failure conditions are observed) 1 Zener diode would be enough. The short circuit current Isc/Io is defined by the break threw voltage of the Zener diode(s) divided by the Resistor value. So if you provide a too high voltage to the barrier (in this drawing) the fuse will blow and avoid that a too high voltage will be provided to the field. Even this drawing is SIMPLIFIED!
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- I have added “ Less maintenance and inspection requirements” (to be 100% correct I have to say: according to IEC requirements).