SIS system instrument delay issue
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Now, when a SIS detection instrument suddenly shows the full scale value for 1 second, it is considered a false alarm. Is it possible to introduce a 2-second delay to prevent the SIS interlock action from being triggered? Will this have any impact on the SIL rating? Please ask an expert for an answer.
Adding a 2-second delay to suppress SIS chain reactions is a viable solution, as it can effectively prevent unnecessary SIS actions triggered by accidental false alarms. However, such a modification may affect the System Safety Integrity Level (SIL), as the response time of the safety functions will be increased. It is recommended to conduct a detailed risk assessment and re-verify the SIL rating to ensure that the security of the system is not compromised as a result of these adjustments. At the same time, it is also necessary to identify the root cause to understand why the instrument is giving false readings; this may require maintenance or replacement of the equipment. .