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Vega VEGAMET 381 Ex Safety Manual

Manual is about: 4...20 mA signal conditioning instruments

Summary of VEGAMET 381 Ex

  • Page 1

    Safety manual vegamet 381 ex 4 … 20 ma signal conditioning instruments document id: 39686 signal conditioning instruments and communication.

  • Page 2: Contents

    Contents 1 scope 1.1 instrument version . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.2 application area . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.3 sil conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 planning 2.1 safety function . . . . . . . . ....

  • Page 3

    De en fr es das vorliegende safety manual für funktionale sicherheit ist verfügbar in den sprachen deutsch, englisch, französisch und spanisch. The current safety manual for functional safety is available in german, english, french and spanish language. Le présent safety manual de sécurité fonctionn...

  • Page 4: Scope

    1 scope 1 .1 instrument version this safety manual applies to the signal conditioning instrument vegamet 381 ex in sil version. Valid version: l instrument serial number >19992538 l instrument software from rev. 1.20.0 1 .2 application area in combination with a 4 … 20 ma transmitter, the signal con...

  • Page 5: Planning

    2 planning 2 .1 safety function the transmitter powered by the signal conditioning instrument generates a signal between 3.8 and 20.5 ma which is proportional to the process variable. Safety function relay output dependent on this analogue signal and the adjusted switching points, one or two relays ...

  • Page 6

    L the specifications according to the operating instructions manual, particularly the current load of the output circuits, must be kept within the specified limits l existing communication interfaces (e. G. Hart, usb) are not used for transmission of the safety-relevant measured value l the instructio...

  • Page 7

    3 safety-related characteristics 3 .1 general figures for all applications parameter according to iec 61508 value safety integrity level sil2 hardware frequency toler- ance hft = 0 instrument type type b mode low demand mode/high demand mode mttr 8 h mtbf = mttf + mttr 1) 1.05 x 10 6 h (120 years) 3 ...

  • Page 8

    3 .3 specific figures for application 2 two relays for control of two actors for monitoring two limit values (e.G. Range monitoring). (1) (2) (3) vegamet (4) (4) fig. 2: structure of application 2 1 current input and processing electronics 2 relay 1 3 relay 2 4 actors λ sd λ su λ dd λ du sff dc s dc d...

  • Page 9

    (1) (2) (3) vegamet (4) (4) fig. 3: structure of application 3 1 current input and processing electronics 2 relay 1 3 relay 2 4 actors (redundant) λ sd λ su λ dd λ du sff dc s dc d 0 fit 334 fit 156 fit 55 fit 90 % 0 % 74 % pfd avg (t1 = 1 year) 0.024 x 10 -2 pfd avg (t1 = 5 years) 0.120 x 10 -2 pfd...

  • Page 10

    Pfd avg (t1 = 1 year) 0.024 x 10 -2 pfd avg (t1 = 5 years) 0.118 x 10 -2 pfd avg (t1 = 10 years) 0.237 x 10 -2 pfh [h-1] 0.054 x 10 -6 diagnosis test period s 3 .6 supplementary information the chronological sequence of pfd avg is nearly linear to the operating time over a period up to 10 years. The...

  • Page 11

    L multiple errors are not taken into account l wear of mechanical not taken into account l failure rates of external power supplies are not taken into account l the environmental conditions correspond to an average industrial environment l the repair time (exchange of the measuring system) after a n...

  • Page 12: Set Up

    4 set up 4 .1 instrument parameter adjustment since plant conditions influence the functional safety of the measuring system, the instrument parameters must be set in compliance with the application. The following adjustment elements or tools are permitted for adjust- ment of the instruments paramete...

  • Page 13: Failure

    5 reaction during operation and in case of failure 5 .1 general information device behaviour during operation or in case of malfunction as well as the respective fault messages are described in the operating instructions manual. The manufacturer must be informed on the occurence of a dangerous, unde...

  • Page 14: Recurring Function Test

    6 recurring function test 6 .1 general information the recurring function test (proof test) serves to test the safety function and to find out possible undetected, dangerous failures. The functional capability of the measuring system has to be tested in adequate time intervals. It is the user's respo...

  • Page 15

    6 .2 test application 1 - one relay output 1 set the simulated sensor current directly (max. 2 %) below the relay switching point "on". 2 set the simulated sensor current directly (max. 2 %) above the relay switching point "off". 1 set the simulated sensor current directly (max. 2 %) above the relay ...

  • Page 16

    Ptc = 97 % 6 .4 test application 3 - two redundant relay outputs see section "test application 1" ptc = 95 % 6 .5 test application 4 - current output adjust at least five values of the simulated sensor current within the measuring range. All measured current output values deviate by less than 2 % fro...

  • Page 17

    Abbreviation unit term adj_max_ma [ ma] adjustment max. Adj_min_ma [ ma] adjustment min. Adj_max_% [%] adjustment max. Adj_min_% [%] adjustment min. Offset_ma [ ma] offset correction switchpoint_ma [ ma] relay switching point switchpoint_% [%] relay switching point value_ma [%] percentage value output...

  • Page 18

    7 supplement a - test protocol function test identification company/tester plant/instrument tag meas. Loop tag instrument type/order code instrument serial number date, setup date, last function test set parameters used safety-relevant outputs o relay 1 o relay 2 o current output offset correction ma ...

  • Page 19

    Current output simulated sensor current expected output current measured output current test result sensor current 1 ma ma ma sensor current 2 ma ma ma sensor current 3 ma ma ma sensor current 4 ma ma ma sensor current 5 ma ma ma date: signature: test result 2 confirmation vegamet 381 ex • 4 … 20 ma ...

  • Page 20

    8 supplement b - explanations of terms sil safety integrity level hft hardware fault tolerance sff safe failure fraction pfd avg average probability of dangerous failure on demand pfh probability of a dangerous failure per hour fmeda failure mode, effects and diagnostics analysis fit failure in time ...

  • Page 21

    Hardware fault tolerance sil1 sil2 sil3 60 % – sil2 sil3 sil4 90 % – sil3 sil4 sil4 ≥ 99 % sil3 sil4 sil4 max. Permitted safety integrity level for a safety function, executed by a safety-related element or subsystem of type b: hardware fault tolerance sff hft = 0 hft = 1 hft = 2 not allowed sil1 si...

  • Page 22

    9 supplement c - sil conformity 22 vegamet 381 ex • 4 … 20 ma signal conditioning instruments 9 s upplement c - sil conformity 39686 -en -110930

  • Page 23

    Vegamet 381 ex • 4 … 20 ma signal conditioning instruments 23 9 s upplement c - sil conformity 39686 - en -110930

  • Page 24

    Vega grieshaber kg am hohenstein 113 77761 s chiltach germany phone +49 7836 50-0 fax +49 7836 50-201 e-mail: info.De@vega.Com www.Vega.Com printing date: iso 9001 all statements concerning scope of delivery, application, practical use and operating conditions of the sensors and processing systems c...