توضیحات
آژیر اعلام حریق ضد انفجار برند MEDC مدل DB4B
(MEDC Brand Loudspeaker Model DB4B)
Overview
The DB4B is a high power explosion proof loudspeaker, introduced as a replacement for the current DB4 with improved intelligibility and acoustic performance.
Certi_ ed for use in a wide range of temperatures from -55°C to +85°C, the Ex enclosure is manufactured from GRP with a rugged thermoplastic _ are providing a corrosion free and aesthetically pleasing product.
The frequency response of the unit ensures that critical voice messages and general alarm tones are highly intelligible.
The speci_ c SPL _ gure for sensitivity, 1W @ 1m is 110dB whilst at 1m the 25W unit produces 124dB, the 15W unit 122dB and the 8W unit 119dB.
Options include DC blocking capacitors for monitored systems, resettable fuses for compliance with marine regulations and
a swivel bracket that gives the installer greater _ exibility when positioning the unit.
The short _ are option is a worthy addition to the range offering a high SPL and wide dispersion angle in a compact unit.
Description
Features
Ex d / Ex de IIC/IIIC T3/T4/T5/T6
Ex d IIC/AEx d IIC Gb
ATEX certi_ ed
IECEx certi_ ed
UL certi_ ed for USA and Canada
(Class I, Div 2, Groups A-D Class I, Zone 1, Ex d IIC/AEx d IIC Gb
Class II, Div 2, Groups F & G Zone 21, AEx tb IIIC ,Class III, Div. 1)
TR CU certi_ ed
CQST certi_ ed
INMETRO certi_ ed
CCOE certified
SIL 2 certified
DNV GL type approved (IEC60945) (Long Flare, Ex d only)
CSFM certified
Certi_ ed temperature -55ºC to +85ºC*
IP66 & IP67/ NEMA 4X & 6
Optional Ex e terminal chamber
۱۲۴dB at 25W, 1m*
۸W, 15W & 25W versions
Power tappings, via integral transformer
Frequency response 350Hz – 8kHz
Ex enclosure – glass reinforced polyester
Flare – high impact thermoplastic polyester
Internal earth stud _ tted as standard
Stainless steel mounting bracket and cover screws
Mounting bracket has ratchet facility as standard
Optional swivel bracket available
Optional resettable fuse†
* Depending on version† Contact MEDC for details
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