Failure rate reference data refers to data that exists to record trends in failure rates for categories of elements that exist in a protective instrument loop. These elements can be categorized by application, technology, size, or any other technical characteristic.
Before you add an element to a protective instrument loop, you can consider the failure rate reference data that is associated with that element type, and then make a decision on whether or not to use that particular element.
Validation failure rate reference data is available for the following records:
Sensor
Logic Solver
Final Element
The Is Reference Data check box in these records is set to True.
Note: By default, the Is Reference Data check box is not included on the datasheet. This field is used by the GE Digital APM system, and is not meant to be modified manually.
When you create a Protective Instrument Loop Element via the Validation Failure Rate Reference Data feature, the GE Digital APM system will automatically select the Is Reference Data check box in that record.
You can use the Validation Failure Rate Reference Data feature to determine which elements are approved for use with a protective instrument loop. After you have determined that a given element is approved, you can select the Approve button in the upper-right corner of the datasheet. When you do so, the GE Digital APM system will automatically select the Approved Custom Device check box in that record, and it will be available for selection in the SIL Verification feature.
If you later determine that an element is no longer approved for use in a protective instrument loop, you can revoke that approval in the record.
Note: To approve a Protective Instrument Loop Element, you must be a member of the SIS Administrator or SIS Engineer Security Group.
