Protective Instrument Loop Sensor Records

Protective Instrument Loop Sensor records store details about a protective instrument loop sensor that you have created as part of SIL verification. This topic provides an alphabetical list and description of the fields that exist for the Protective Instrument Loop Sensor family and appear on the Protective Instrument Loop datasheet by default. The information in this table reflects the baseline state and behavior of these fields.

This family is enabled for site filtering, which means that records in this family can be assigned to a specific site, and will then only be accessible to users who are assigned to the same site and have the appropriate license and family privileges. See the Site Filtering section of the documentation for more information on using this feature.

Field	Data Type	Description	Behavior and Usage
Alarm Filter	Logical	Indicates whether alarm filtering will be used.	Select this check box if the sensor reports the origin of a failure. This should be used in conjunction with Alarm Setting (High/Low) and is applicable only for diagnostic selection.
Alarm Setting(High/Low)	Logical	Indicates the direction of the alarm.	If the alarm setting is high, select this check box. If the alarm setting is low, clear this check box. This should be used in conjunction with Alarm Filter and is applicable only for diagnostic selection.
Alarm Voted as Trip	Logical	Indicates whether the alarm is voted as a trip.	If the alarm is voted as a trip, select this check box. This is applicable only for diagnostic selection.
Analog Trip	Character	Indicates the direction of the trip.	The following options are available: High Low This is applicable only for diagnostic selection.
Approved Custom Device	Logical	Indicates whether the sensor is approved to be used.	This field is disabled and selected if the sensor has been approved to use via the Validation Failure Rate Reference Data feature.
Base SFF	Number	Safe Failure Fraction without diagnostic detection.	This field is disabled. The GE Digital APM system calculates this value based on the sensor, the interfaces, and the connections for the sensor.
Connection	Character	The type of physical connection between the sensor and the process.	The values in this list are based on the value in the Sensor Type field.
Description	Character	A brief description of the sensor.	None
External Comparison	Logical	Indicates whether the sensor is compared with another similar sensor.	Select this check box if you will use another device for comparative measurement. This is applicable only for diagnostic selection.
External Comparison Value	Number	The percentage of failure detected by external comparison.	This field is enabled only if the External Comparison check box is selected. This is applicable only for diagnostic selection.
Interface A	Character	The interface between the sensor and the logic solver.	The values in this list are from Exida's Safety Equipment Reliability Handbook (SERH) and are based on the value in the Sensor field.
Interface B	Character	A second interface between the sensor and the logic solver.	The values in this list are from Exida's Safety Equipment Reliability Handbook (SERH) and are based on the values in the Sensor and Interface A fields.
Over/Under Range	Logical	Indicates the direction of failure detected by the sensor.	If the sensor detects a failure for over range, select this check box. If the sensor detects a failure for under range, clear this check box. This is applicable only for diagnostic selection.
Sensor	Character	The name of the sensor.	The values in this list are from Exida's Safety Equipment Reliability Handbook (SERH) and are based on the value in the Sensor Type field.
Sensor ID	Character	The ID of the sensor.	This value is required and is populated with a default value. You can, however, provide a different value. This value must be unique.
Sensor Type	Character	A value representing the measurement type of the sensor.	This field contains the following options: FireGas Flow Level Other Pressure Proximity
SFF	Number	Safe Failure Fraction after applying diagnostics for the sensor.	This field is disabled. The GE Digital APM system calculates this value, which is used to calculate MTTFS.