An Instrument Index (or Instrument Schedule) is a document containing list of instrument devices within a plant that includes the description and complete listing by tag numbers, procurement, and installation information as well as loop drawing number and field installation details. The Instrument Index is maintained for the life of a facility for the recording and controlling the instrumentation and functions. The Instrument Index is a deliverable document of the Detailed Design and Engineering developed by a CSI (Control Systems and Instrumentaion) discipline.
Reference Definition by Instrumentationportal.com: Instrument index is a document containing list of instrument devices within a plant. Instrument index shall include tag number of all physical instruments (e.g. field instrument, physical alarm and indicator) and pseudo instruments which commonly named “soft tag” (e.g DCS indication, alarm, controller). Instrument index shall be created at the beginning of project and considered as a live document which should be kept updated even though the plant has been operated. Instrument index shall be revised if there is any plant or system modification which impact to additional, removal, or resetting of instrument. In instrument index document, the following information should be stated but not limited to: Tag number/ Loop Number/ Type of Instrument/ Location/ Service description/ P&ID Number/ Line number or equipment number/ I/O Type/ Control System/ Range or set point along with engineering unit used/ Applicable reference Document (Instrument Data Sheet Number, Hook-up Drawing Number, Instrument Layout Number, Loop Drawing Number)/ Package Number/ Manufacturer/ Model Number.
Related Definitions in the Project: The CSI Engineering; Engineering; FEED Deliverable; Detailed Design and Engineering
