BHY BHY series drum explosion-proof speaker speaker (hereinafter referred to as the speaker) is for noisy explosive hazardous areas designed for public address communication system equipment. Suitable for IIA, IIB, IIC class T1 ~ T6 temperature class (1 and Zone 2) of explosive hazardous areas, can be widely used in petroleum, chemical, pharmaceutical, military, oil depots, terminals and other places. (3) The speaker meets the following criteria: GB3836.1-2000 GB3836.2-2000 IEC60079-0 IEC60079-1 4 environmental conditions: a) Altitude: ≤ 2000 米; b) Working temperature:. -20 ℃ ~ + 40 ℃; c) ambient air relative humidity less than 95% (+25 ℃); d) in the absence of significant shake and shock vibrations; e) without damage to the insulation of gas or vapor environment; f) Pollution Degree : 3. g) Installation category: II class. Installation, use and maintenance of an installation parameters listed on the nameplate before checking whether the actual conditions of use. 2 speakers installed by professionals. 3 can not directly access the speaker output of the amplifier output voltage, otherwise it will damage the product. 4 speakers must be grounded. 5 After the installation or power supply must be disconnected before the class maintenance openings! 6 according to GB3836.15 standards, combined with on-site working conditions, periodic inspection; 7 after speaker installation is complete, you should check before sending electrical insulation resistance between the electrode and the shell is normal in order to send power back to normal. 8 in the installation, maintenance speaker, should be taken to ensure the introduction of the pressing ring device, in order to avoid internal speaker or affect water-proof performance. Check the seals on a regular basis, if found its aging should contact me to order, and timely replacement. 9 speakers regularly check whether there is loosening the fastening screws, if required for a professional for repair loose. 10 should be checked regularly to connect securely connected, so as not to affect the performance of electricity; 11 if found faulty speaker, qualified personnel for repairs.