Explosionproof loudspeaker is intended for transmission of verbal and sound messages at industrial facilities having explosion hazardous areas according to the explosion protection marking.
It can be used not only for sound transmission, but for verbal message transmission.
Due to developed and mathematically calculated form of resonator loudspeaker ensures transmission of messages without distortion at long range.
It has two standard dimensions depending on the required power.
Loudspeaker consists of explosionproof enclosure and resonator (voice amplifier). In enclosure, which consists of body and cover connected with thread, speaker and terminal clamps are installed. On the body brace for loudspeaker fastening is fixed. Cable gland, near which grounding bolt is located, is installed in the body.
VELAN-VG – explosionproof loudspeaker.
Х1 – loudspeaker power W:
5, 10, 15 – first standard dimension (length 307 mm, diameter 277 mm);
20, 25 – second standard dimension (length 434 mm, diameter 495 mm);
Х2 is an explosion protection marking: 1ExdIIBT6 X
X3 – type of climatic version and arrangement category according to GOST 15150: UHL1
Example of designation record for explosionproof loudspeaker with power 15 W:
Explosion protection marking: 1ExdIIBT6 X
Nominal power, W: 5, 10, 15, 20, 25
Nominal input voltage, V: 9, 12, 15, 18, 20
Nominal electrical resistance, Ohm: 16
Effective operating frequency range, Hz: 400–4000
Power of sound pressure at output, within band 800–3150 Hz, at least: 103 dB
Level of dust and moisture protection: IP65
Ambient temperature: from -60 °С to +50 °С
Weight, kg: 2.8, 3.2
Number of technical conditions: TU 6652-001-00213569-2015