[Weekend Share-6] What level of alarm signal should be used for various audio and visual alarms?

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This post was last edited by zhoudingshengs on 2024-12-14 at 11:49. 1. What level of alarm signal should be used for various audio and visual alarms? 【Answer】The alarm built into the on-site detector receives the first and second level alarm signals; the area alarm in the on-site location receives the second level alarm signal, while the fire control center receives the second level alarm signals as well. 【Basis】GB/T 50493-2019 Design Code for Detection and Alarm of Flammable and Toxic Gases in Petrochemical Industries 5.3.1 The detection and alarm systems for flammable and toxic gases shall be divided into alarm zones according to the installations or units in production facilities and storage and transportation facilities; an on-site alarm device shall be installed in each alarm zone. The activation signal for the area alarm should use the second-level alarm setpoint signal. The number of area alarms should be such that personnel on site at any location within that area can detect the alarm. 5.3.3 Toxic gas detectors should be equipped with integrated audible and visual alarms; combustible gas detectors may also be equipped with integrated audible and visual alarms. The activation signal for these integrated audible and visual alarms should be based on the signal corresponding to the first-level alarm setting. 5.4.2 The sound pressure level of the audible and visual alarms for combustible gases and toxic gases in the control room shall be not less than 75 dBA at a distance of 1 m in front of the equipment; the activation signals for these audible and visual alarms shall use the second-level alarm setpoint signal.