Integrating indicator (Class 5)

Also called: Class 5 chemical indicator, integrator

Integrating indicator (Class 5) — A Class 5 chemical indicator that reacts to all critical variables of a steam cycle, with performance set against that of a biological indicator.

Class 5 integrators are designed so that their stated values correspond to the inactivation performance of a biological indicator under ISO 11138. Many CSSDs use them for in-pack monitoring and, where local policy allows, for releasing routine loads.

They are typically used in a process challenge device for load monitoring, while biological indicators remain the reference for implant loads and validation.

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