SIST EN ISO 11205:2009 PDF

Overview

EN ISO 11205:2009 (ISO 11205:2003) - Acoustics - specifies an engineering method (grade 2 accuracy) for determining the emission sound pressure levels of machinery and equipment in situ using sound intensity measurements. It is intended for machines that emit stationary broadband noise, including sources with narrow‑band or discrete frequency components, and can be applied at the work station or other specified positions. EN ISO 11205 is an alternative approach to in‑situ noise assessment alongside ISO 11201, ISO 11202 and ISO 11204.

Key topics and requirements

• Measurement principle: Use of sound intensity to derive emission sound pressure levels at specified positions in the machine’s operational environment.
• Accuracy class: Engineering method with grade 2 uncertainty characterization.
• Applicability: Valid for all test environments that meet the standard’s background noise and field indicator requirements.
• Instrumentation & calibration: Requirements for sound intensity probes (pairs of pressure‑sensing microphones), calibration (reference calibrators), and suitable instrumentation per normative references.
• Test procedure elements: Guidance on machine installation and operation, measurement time intervals, measurement positions, handling of wind/gas flows, and frequency range considerations (including procedures for >5 000 Hz).
• Qualification criteria: Criteria for directionality of the sound intensity vector and for acceptable background noise levels to ensure valid in‑situ results.
• Data handling: Requirements for evaluation of measurement results, measurement uncertainty, and comprehensive recording/reporting of test conditions, instrumentation, machine data and noise data.

Applications and users

EN ISO 11205 is used where on‑site noise emission assessment is required:

• Acoustical consultants and test laboratories performing workplace noise evaluations.
• Original equipment manufacturers (OEMs) and machine designers assessing machine noise at the point of use.
• Health & safety professionals evaluating worker exposure at the work station.
• Regulatory compliance teams seeking conformity with EU machinery directives (e.g., 2006/42/EC) where noise emission data are required.

Practical applications include noise mapping of production lines, verification of declared machine emission levels, and engineering assessments for noise control measures.

Related standards

• ISO 11201, ISO 11202, ISO 11204 (alternative in‑situ methods)
• ISO 7574-1, ISO 12001 (statistical and test code rules)
• IEC 60942 (sound calibrators), IEC 61043 (sound intensity instrumentation)

Keywords: EN ISO 11205:2009, ISO 11205, acoustics, noise emitted by machinery, sound intensity, in situ measurements, emission sound pressure levels, workplace noise, measurement uncertainty.