ISO 9612:2009 (Acoustics — Determination of occupational noise exposure — Engineering method) is the primary international standard specifying how to measure workplace noise and calculate workers' daily noise exposure levels (LEX,8h). Compliance with ISO 9612 is required or referenced in occupational health regulations across Europe, Asia, and the Middle East, and is considered best practice globally for rigorous noise at work assessments.
SoundPLANmanda is designed to support ISO 9612 assessment workflows — combining measured noise data with 3D facility modeling to produce compliant exposure calculations and documentation.
SoundPLANmanda enables a hybrid approach: measurement data from ISO 9612 surveys can be complemented by noise mapping model predictions, providing a comprehensive facility assessment. The software calculates LEX,8h for each worker role using task durations and measured or modelled noise levels, and generates the documentation required for ISO 9612 compliance records.
The task-based measurement strategy is the most commonly used approach in practice. It involves identifying the main tasks that make up a worker's day, measuring the LAeq,T for each task separately (typically 2–3 measurements per task, each of sufficient duration to capture the noise variation), and then combining task measurements using the time fractions the worker spends on each task. This is well-suited to SoundPLANmanda's workflow, where task noise levels can be entered from measurements and the software applies the time fractions automatically to calculate LEX,8h.
The full-shift measurement strategy — where the worker wears a dosemeter for an entire shift — is simpler to execute in the field but provides less diagnostic information about which tasks or machines are the primary noise contributors. It is most appropriate for workers with highly variable, unpredictable daily routines.
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