SIST EN 60721-3-9:2001

Classification of environmental conditions -- Part 3: Classification of groups of environmental parameters and their severities -- Section 9: Microclimates inside products

Defines classes of microclimatic conditions, to which components (basic parts, assemblies, built-in units) may be subjected inside products, and which are used under the climatic conditions classified in EN 60721-3-3 and EN 60721-3-4.

Klassifizierung von Umweltbedingungen -- Teil 3: Klassen von Umwelteinflußgrößen und deren Grenzwerte -- Hauptabschnitt 9: Mikroklimate innerhalb von Erzeugnissen

Classification des conditions d'environnement -- Partie 3: Classification des groupements des agents d'environnement et de leurs sévérités -- Section 9: Microclimats à l'intérieur des produits

Définit les classes des conditions microclimatiques, auxquelles les composants (parties élémentaires, assemblées et encastrées) peuvent être soumis à l'intérieur des produits, quand ils sont utilisés dans des conditions climatiques qui sont classifiées dans les EN 60721-3-3 et EN 60721-3-4.

Classification of environmental conditions - Part 3: Classification of groups of environmental parameters and their severities - Section 9: Microclimates inside products

General Information

• Status: Published
• Publication Date: 31-Aug-2001
• ICS: 19.040 - Environmental testing
• Technical Committee: I09 - Imaginarni 09
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Sep-2001
• Due Date: 01-Sep-2001
• Completion Date: 01-Sep-2001
• Ref Project: EN 60721-3-9:1993 - Classification of environmental conditions - Part 3: Classification of groups of environmental parameters and their severities - Section 9: Microclimates inside products

Relations

• Replaced By: SIST EN IEC 60721-3-9:2024 - Classification of environmental conditions - Part 3-9: Classification of groups of environmental parameters and their severities - Microclimates inside products (IEC 60721-3-9:2024)
• Effective Date: 01-Jul-2024
• Amended By: SIST EN 60721-3-9:2001/A1:2001 - Classification of environmental conditions -- Part 3: Classification of groups of environmental parameters and their severities -- Section 9: Microclimates inside products
• Effective Date: 21-Sep-2010

Overview

EN 60721-3-9:1993 (CLC) specifies the classification of microclimates inside products - the local environmental conditions to which internal components (basic parts, assemblies, built‑in units) may be exposed. It defines classes of microclimatic conditions and their severities for use when components operate under the broader climatic classifications given in EN 60721-3-3 and EN 60721-3-4. This standard is part of the EN 60721 series for classification of environmental conditions and is intended to support consistent specification, testing and documentation of in‑product environmental stresses.

Key Topics

• Scope and purpose: classification framework for microclimates inside products applied to internal components, assemblies and built‑in units.
• Classes and severities: defined groupings that describe the intensity and frequency of internal environmental conditions (severity levels used to communicate requirements).
• Relation to external climates: linkage to climatic classes defined in EN 60721-3-3 and EN 60721-3-4 so designers can translate external environment into expected internal microclimates.
• Specification guidance: how to use microclimate classes to set requirements for component selection, design margins and test criteria.
• Documentation and communication: standardized terminology and classification to improve supplier–manufacturer and tester communication.

Note: EN 60721-3-9 provides a classification framework rather than prescriptive test methods; it is used to define the conditions that tests or design verifications should address.

Applications

• Product design and development - engineers use microclimate classes to select components and design enclosures that ensure reliability under expected internal conditions.
• Component and assembly specification - procurement and technical specifications reference microclimate classes to ensure compatibility and performance.
• Environmental testing and qualification - test laboratories and quality teams translate classified microclimates into test profiles or pass/fail criteria.
• Reliability and maintenance planning - helps predict failure modes related to internal environmental stresses and plan mitigation (ventilation, coatings, sealing).
• Regulatory and contractual documentation - provides a common language for contractual requirements and compliance evidence.

Who would use this standard

Product designers, component manufacturers, reliability engineers, test laboratories, procurement/specification writers and quality assurance teams involved in electromechanical and electronic products where internal environmental conditions affect performance.

Related Standards

• EN 60721-3-3 - climatic influences for fixed and transportable products (reference for external climates)
• EN 60721-3-4 - climatic influences for equipment transported by road/rail/air/sea (related external classifications)
• EN 60721 series - broader framework for environmental condition classification

Keywords: EN 60721-3-9:1993, microclimates inside products, classification of environmental conditions, environmental testing, CLC, EN 60721-3-3, EN 60721-3-4.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2001
Classification of environmental conditions - Part 3: Classification of groups of
environmental parameters and their severities - Section 9: Microclimates inside
products
Classification of environmental conditions -- Part 3: Classification of groups of
environmental parameters and their severities -- Section 9: Microclimates inside products
Klassifizierung von Umweltbedingungen -- Teil 3: Klassen von Umwelteinflußgrößen und
deren Grenzwerte -- Hauptabschnitt 9: Mikroklimate innerhalb von Erzeugnissen
Classification des conditions d'environnement -- Partie 3: Classification des groupements
des agents d'environnement et de leurs sévérités -- Section 9: Microclimats à l'intérieur
des produits
Ta slovenski standard je istoveten z: EN 60721-3-9:1993
ICS:
19.040 Preskušanje v zvezi z Environmental testing
okoljem
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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