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Vega VEGAMET 381 Ex Safety Manual

4...20 ma signal conditioning instruments
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Safety Manual
VEGAMET 381 Ex
4 ... 20 mA signal conditioning instruments
Document ID:
39686
Signal
conditioning instruments
and communication

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Summary of Contents for Vega 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: Table Of Contents

    Test application 4 - Current output....16 Calculation realy switching points and output current . 16 Supplement A - Test protocol function test Supplement B - Explanations of terms Supplement C - SIL conformity VEGAMET 381 Ex • 4 … 20 mA signal conditioning instruments...
  • Page 3 Om du har problem att läsa säkerhetsanvisningarna på de här tryckta språken, ställer vi gärna på begäran en kopia på ditt språk till förfogande. VEGAMET 381 Ex • 4 … 20 mA signal conditioning instruments...

  • Page 4: Scope

    For the current output, only the characteristics 4 … 20 mA is permitted! 1.3 SIL conformity The SIL conformity is confirmed by the verification documents in the appendix. VEGAMET 381 Ex • 4 … 20 mA signal conditioning instruments...

  • Page 5: Planning

    "fail low" ≤ 3.6 mA "fail high" > 21 mA 2.3 Prerequisites for operation The measuring system should suit the application. The applica- General instructions and restrictions tion-specific limits must be maintained VEGAMET 381 Ex • 4 … 20 mA signal conditioning instruments...
  • Page 6 The instructions in chapter "Safety-technical characteristics", paragraph "Supplementary information" must be noted All parts of the measuring chain must correspond to the planned "Safety Integrity Level (SIL)" VEGAMET 381 Ex • 4 … 20 mA signal conditioning instruments...

  • Page 7: Safety-Related Characteristics

    (T1 = 5 years) 0.172 x 10 (T1 = 10 years) 0.344 x 10 PFH [h-1] 0.079 x 10 Diagnosis test period < 4 s MTBF: Including errors outside the safety function VEGAMET 381 Ex • 4 … 20 mA signal conditioning instruments...

  • Page 8: Specific Figures For Application 2

    Two relay outputs, re- dundantly connected a limit value. Note: The closing contacts of the two relays are connected in series. Both relay switching points have the same setting. VEGAMET 381 Ex • 4 … 20 mA signal conditioning instruments...

  • Page 9: Specific Figures For Application 4

    Fig. 4: Structure of application 4 Current input and processing electronics Current output Connected processing unit λ λ λ λ 0 FIT 11 FIT 386 FIT 54 FIT 88 % 88 % VEGAMET 381 Ex • 4 … 20 mA signal conditioning instruments...

  • Page 10: Supplementary Information

    Similar factors apply if frequent temperature fluctations are expected. The failure rates are constant. Take note of the useful life of the Assumptions of the components according to IEC 61508-2. FMEDA VEGAMET 381 Ex • 4 … 20 mA signal conditioning instruments...
  • Page 11 The dafety-related characteristics must be calculated especially for the selected structure of the measuring chain by means of the stated failure rates. For this purpose, a suitable common cause factor must be taken into account. VEGAMET 381 Ex • 4 … 20 mA signal conditioning instruments...

  • Page 12: Set Up

    During setup, it is recommended to check the safety function, e.g. by means of a first filling or simulation of the input signal. The procedure described in chapter "Recurring function test" can be used. VEGAMET 381 Ex • 4 … 20 mA signal conditioning instruments...

  • Page 13: Reaction During Operation And In Case Of Failure

    < 1 s E017 (adjustment span too small) < 1 s E021 (scaling span too small) < 1 s E110 (relay switching points too close together) < 1 s VEGAMET 381 Ex • 4 … 20 mA signal conditioning instruments...

  • Page 14: Recurring Function Test

    It must be noted that the function test influences the connected instruments. If necessary, other measures must be taken to maintain the safety function. After the function test, the status specified for the safety function must be restored. VEGAMET 381 Ex • 4 … 20 mA signal conditioning instruments...

  • Page 15: Test Application 1 - One Relay Output

    Point 3: The SIL relay contact for monitoring the upper range limit must be open. Point 4: The SIL relay contact for monitoring the lower range limit must be open. VEGAMET 381 Ex • 4 … 20 mA signal conditioning instruments...

  • Page 16: Test Application 3 - Two Redundant Relay Outputs

    OutputValue_mA = x 16mA + 4mA 100% (Adj_max_% - Adj_min_%) with Value_% = (InputValue_mA - Adj_min_mA - Offset_mA) x (Adj_max_mA - Adj_min_mA) Abbreviations Abbreviation Unit Term InputValue_mA Sensor current [mA] VEGAMET 381 Ex • 4 … 20 mA signal conditioning instruments...
  • Page 17 Adjustment min. [mA] Adj_max_% Adjustment max. Adj_min_% Adjustment min. Offset_mA Offset correction [mA] SwitchPoint_mA Relay switching point [mA] SwitchPoint_% Relay switching point Value_mA Percentage value OutputValue_mA Output current [mA] VEGAMET 381 Ex • 4 … 20 mA signal conditioning instruments...

  • Page 18: Supplement A - Test Protocol Function Test

    Relay output 2 Switching Measured Condition Test result Measured Condition Test result point sensor cur- sensor cur- Relay 1 Relay 2 rent rent "on" "on" "on" "off" "off" "off" VEGAMET 381 Ex • 4 … 20 mA signal conditioning instruments...
  • Page 19 Simulated sensor current Expected Measured Test result Output current Output current Sensor current 1 Sensor current 2 Sensor current 3 Sensor current 4 Sensor current 5 Confirmation Date: Signature: VEGAMET 381 Ex • 4 … 20 mA signal conditioning instruments...

  • Page 20: Supplement B - Explanations Of Terms

    Max. permitted safety integrity level for a safety function, executed by Safety integrity for sub- systems of type A a safety-related element or subsystem of Type A: Hardware Fault Tolerance HFT = 0 HFT = 1 HFT = 2 VEGAMET 381 Ex • 4 … 20 mA signal conditioning instruments...
  • Page 21 SIL1 SIL2 < 60 % SIL1 SIL2 SIL3 60 % – < 90 % SIL2 SIL3 SIL4 90 % – < 99 % SIL3 SIL4 SIL4 ≥ 99 % VEGAMET 381 Ex • 4 … 20 mA signal conditioning instruments...

  • Page 22: Supplement C - Sil Conformity

    9 Supplement C - SIL conformity 9 Supplement C - SIL conformity VEGAMET 381 Ex • 4 … 20 mA signal conditioning instruments...
  • Page 23 9 Supplement C - SIL conformity VEGAMET 381 Ex • 4 … 20 mA signal conditioning instruments...
  • Page 24 All statements concerning scope of delivery, application, practical use and operating conditions of the sensors and processing systems correspond to the information avail- able at the time of printing. © VEGA Grieshaber KG, Schiltach/Germany 2011 Subject to change without prior notice 39686-EN-110930...

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