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IL

IL — Instrument List

A controlled engineering document that defines and identifies all instruments within a facility or project.

Definition

An Instrument List (IL) is a master engineering document that records every instrument installed within a process facility, including tag numbers, service descriptions, instrument types, specifications, process connections, locations and associated design data. It serves as the primary reference for instrumentation design, procurement, construction, commissioning and maintenance.

Why It Matters

The Instrument List provides a single authoritative register of field instrumentation throughout the asset lifecycle.

In Practice

Instrument Lists are developed during detailed engineering and maintained throughout construction, commissioning and operations as instruments are installed, modified or replaced.

Common Misuse

An Instrument List identifies physical field instruments, whereas an I/O List identifies the signals exchanged between those instruments and the control system.

Term Details
Synonyms:
IL; Instrument List; Instrument Index; Instrument Register
Classification:
Engineering Documentation
Document Type
Intermediate
Applications

Process Control; Instrumentation; Engineering Documentation.

Where It's Used

Process plants.; Instrumentation engineering.; DCS and PLC projects.; Commissioning.; Asset management.

References

ISA 5.1

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