BS EN 352-9:2020 pdf free.Hearing protectors一Safety requirements,Earplugs with safety-related audio input.
BS EN 352-9 This document is applicable to earplugs supplemented by a safety-related audio input. The audio signal can be transmitted by electrical input or other communication like Bluetooth1. It specifies requirements on construction, design, performance, marking and user information related to the inclusion of the safety-related audio input.Earplugs with safety-related audio input are designed to provide speech information and warning signals, while providing attenuation of external sound. They may be selected for use in a number of
different environments, for example in air traffic communication, in the police forces, in the broadcasting and entertainment industries.The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.EN 352-2:2020, Hearing protectors – General requirements – Part 2: Earplugs EN 13819-3:2019, Hearing protectors一Testing 一Part 3: Supplementary acoustic test methods.Earplugs with safety-related audio input shall meet the requirements of EN 352 -2:2020 and the requirements listed in 4.2.4.2 Sound output levels and criterion input signal The sound output level of the earplugs with electrical audio input shall be measured in accordance with EN 13819-3:2019, 7.6.2.2.1. For earplugs with Bluetooth audio input, the sound output level shall be measured according to EN 13819-3:2019, 7.5.2.2.1.The criterion input signal for earplugs with electrical audio input shall be calculated according to EN 13819-3:2019, 7.6.2.2.1 and for earplugs with Bluetooth audio input according to EN 13819-3:2019,7.5.2.2.1.the relationship between sound output level and input signal in 5 dB steps from a sound output level of 70 dB(A) up to the maximum input signal;the sound output level for maximum input signal;the usage time for the maximum input signal that corresponds to an equivalent sound output level of 82 dB(A] over 8 h;a method for checking, charging and changing batteries, if applicable;statements that include the following information:1) The earplug is provided with safety-related audio input. The user should check correct operation before use. If distortion or failure is detected, the user should refer to the manufacturer’s advice for maintenance;2] A warning that the output of the audio circuit of this hearing protector may exceed the exposure limit level;3) A warning that this product may not be used for entertainment since the output level is not limited to the necessary innocuousness level.BS EN 352-9 pdf downlaod.