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'i' Ik_000.PPT - ispark Explosionprotection made by PTB: Physikalisch-Technische Bundesanstalt Braunschweig und Berlin a method for computer aided assessment.

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Presentation on theme: "'i' Ik_000.PPT - ispark Explosionprotection made by PTB: Physikalisch-Technische Bundesanstalt Braunschweig und Berlin a method for computer aided assessment."— Presentation transcript:

1 'i' Ik_000.PPT - ispark Explosionprotection made by PTB: Physikalisch-Technische Bundesanstalt Braunschweig und Berlin a method for computer aided assessment and design of intrinsically safe circuits with L o and C o

2 'i' - ispark User target group Physikalisch-Technische Bundesanstalt Braunschweig und Berlin 104  Operators of sites requiring explosion protection  Manufacturers of explosion protected apparatus  Third party experts  Testing and certification bodies

3 'i' - ispark What does the method provide? Physikalisch-Technische Bundesanstalt Braunschweig und Berlin On the base of preset electrical source data, intrinsic safety of the source itself is checked and maximum permissible capacitances C o and inductances L o are determined, specialities of cable reactances are picked up, granting some more headspace for site installations 100

4 'i' - ispark How does it work? Physikalisch-Technische Bundesanstalt Braunschweig und Berlin Systematic investigation of experimental ignition testing results, using the standardized spark test apparatus, yielded characteristic electrical and calorical parameters. A computer program uses these parameters for a model based calculation 110

5 'i' - ispark Competing methods Physikalisch-Technische Bundesanstalt Braunschweig und Berlin 114  practical use of the standardized spark test apparatus  analytical evaluation against reference ignition data according to IEC

6 'i' - ispark Disadvantages of practically using the standardized spark test apparatus Physikalisch-Technische Bundesanstalt Braunschweig und Berlin 119  the standardized spark test apparatus itself, including appropriate infrastructure, is required  usage is prone to errors and often lengthy  experimental results are dependable only if statistically analysed, the standardized type test reveals no real significance

7 'i' - ispark Drawbacks using reference ignition data Physikalisch-Technische Bundesanstalt Braunschweig und Berlin 121  reference ignition data are available only for some very simple sources and circuits  certain effects are not comprised by those data, for example non linearities and cables  usage is prone to error and often lengthy  reference ignition data often reveal quantita- tive contradictions

8 'i' - ispark ispark Advantages using ispark Physikalisch-Technische Bundesanstalt Braunschweig und Berlin 140  arbitrary electrical sources can be assessed  circuits comprising both, inductances AND capacitances as well as cables, are included  the application is simpliest to use  reproducibility and coherence are very high

9 'i' - ispark What kind of data must be preset? Physikalisch-Technische Bundesanstalt Braunschweig und Berlin 150  zone 0,1 resp. zone 2 (safety factor 1,5 resp. 1,0)  gasgroup  type of circuit including quantities  for multiple sources parallel and/or serial con- nection  type of freewheeling if any  Cable data: L‘, C‘ and R‘

10 'i' - ispark What kind of data are reported? Physikalisch-Technische Bundesanstalt Braunschweig und Berlin 160  summary of preset data  if the source is determined intrinsically safe, a list of maximum L o /C o pairs which are per- missible concurrently within the circuit  if inclusion of cables is claimed, additionally to C o /L o pairs, a maximum cable length extra allowed

11 'i' - ispark ispark What's needed to use ispark? Physikalisch-Technische Bundesanstalt Braunschweig und Berlin 180  personnel for type in electrical data and handle the reported results  a common standard PC running at least Win2000 (upto Win7_64) ispark  the program package ispark itself  a license granted by PTB (royalty is € , halved for acknowledged certification bodies) ispark  Note: License includes all subsequent impro- vements/versions of ispark without additional charge

12 'i' - ispark‘s ispark‘s status today? Physikalisch-Technische Bundesanstalt Braunschweig und Berlin 180 ispark  in PTB using ispark is the first choice when assessing circuits for certification ispark  about one-third of European Notified Bodies have a license for ispark  as well as one-third of IECEx participants  weaknesses of standardized experimental type testing nowadays are found more and more

13 'i' - ispark For further information please contact Physikalisch-Technische Bundesanstalt Braunschweig und Berlin 190 Martin Krämer, Dipl.-Ing., Ag 3.62 Physikalisch-Technische Bundesanstalt Bundesallee Braunschweig, DEUTSCHLAND tel:(+49) 0531/ fax:(+49) 0531/


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