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I want an advice regarding integration of SIL-2 SIS transmitters integration with ESD system. We are using 3051 CTL SIS transmitters from Rosemount.
Our ESD system (Yokogawa Prosafe) AI cards are not HART pass through cards thus diagnostics related to SIS transmitters are not available in the our PRM server (Plant resource manager). In many instance we are using single SIL-2 SIS transmitter to meet the Target SIL by virtue of its PFD and SFF values. This is different from proven in use installation where we would normally use Proven in transmitter , 2 nos in 1oo2 config to meet SIL-2.
Is it OK in the above situation that I use a single SIL-2 transmitter whose HART diagnostics are not captured by the PRM to meet Target SIL-2. Is it absolute must to have the diagnostic integrated in PRM to schedule any predictive maintenance.
SIL-2 certification scope as per FMEDA restricts itself only to the instrument, its hardware and software but does not talk anything on the integration of its diagnostics with ESD system.
Now HART pass through ESD AI card is available from Yokogawa and we are looking at changing these cards for SIL-2 loops only. But again the cost is exorbitant and before I go down that path and recommend this solution, I want to be sure that this is an absolute must. I am really not comfortable using single transmitter for SIL-2 application and if we also ignore the diagnoses then is it really a proper installation.
Is this requirement governed by IEC 61509 or IEC61511 ?
Seek your reply & help
my e-mail contact is gupta_g_r [at] yahoo.com
Our ESD system (Yokogawa Prosafe) AI cards are not HART pass through cards thus diagnostics related to SIS transmitters are not available in the our PRM server (Plant resource manager). In many instance we are using single SIL-2 SIS transmitter to meet the Target SIL by virtue of its PFD and SFF values. This is different from proven in use installation where we would normally use Proven in transmitter , 2 nos in 1oo2 config to meet SIL-2.
Is it OK in the above situation that I use a single SIL-2 transmitter whose HART diagnostics are not captured by the PRM to meet Target SIL-2. Is it absolute must to have the diagnostic integrated in PRM to schedule any predictive maintenance.
SIL-2 certification scope as per FMEDA restricts itself only to the instrument, its hardware and software but does not talk anything on the integration of its diagnostics with ESD system.
Now HART pass through ESD AI card is available from Yokogawa and we are looking at changing these cards for SIL-2 loops only. But again the cost is exorbitant and before I go down that path and recommend this solution, I want to be sure that this is an absolute must. I am really not comfortable using single transmitter for SIL-2 application and if we also ignore the diagnoses then is it really a proper installation.
Is this requirement governed by IEC 61509 or IEC61511 ?
Seek your reply & help
my e-mail contact is gupta_g_r [at] yahoo.com