Glossary Updates12 new terms added to the glossaries · October 2, 2026, 22:44 CEST
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Glossary · Safety standards

ISA-18.2

Also known as: IEC 62682

German: ISA-18.2

ANSI/ISA-18.2 is the standard for the management of alarm systems in the process industries; it defines an alarm management lifecycle including alarm philosophy, identification, rationalization, design, implementation, operation, maintenance, monitoring and management of change.

  • Standards

In one sentence

ANSI/ISA-18.2 defines the lifecycle for managing alarm systems in process industries, from alarm philosophy to monitoring and change.

Example

After an alarm flood during a plant trip, the operator rationalizes all alarms according to ISA-18.2 and removes those that require no operator action.

How it applies

  • Engineering: An alarm philosophy document defines what counts as an alarm, priorities and response expectations; every alarm should require a defined operator action.
  • Operation: Performance monitoring (alarm rates, standing alarms, floods) shows whether the system supports operators or overwhelms them.
  • Documentation: Alarm response procedures, causes and consequences are documented per alarm (master alarm database); the documentation team should align HMI texts and operating instructions with it.
  • Safety: Alarms that are credited as a layer of protection in a safety analysis need specific design and testing requirements.

ISA-18.2 vs. IEC 62682

IEC 62682 is the international standard based on ISA-18.2 with largely aligned content. Related guidance is found in EEMUA 191 and NAMUR NA 102.

By knowledge.aitechdoc.world · Published September 26, 2026 · Last reviewed

Source: ANSI/ISA-18.2, Management of Alarm Systems for the Process Industries

Definitions follow the cited standards and specifications. Where a source is a copyrighted publication, such as an ISO, IEC or EN standard, the definition is a close paraphrase, not a verbatim quotation, so as not to infringe copyright. We recommend reading the original publication. The sections “How it applies” are editorial commentary by AI TechDoc Blog and are not part of any standard.

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