Hemi-Directional Loudspeakers from Bosch Installed at TÜDEMSAS Railway Machinery Factory in Turkey

Full Audio over IP-based Public Address and emergency evacuation system designed and installed by Entegre Electronics

Established in 1939, TÜDEMSAS (Turkish Railway Machines Industry Inc.) repairs freight and passenger wagons and manufactures freight wagons and spare parts. Its factory in Sivas, Turkey has a total area of 287,467 m2 with an additional indoor area of 96,000 m2. The factory employs 1,500 people, making TÜDEMSAS one of the biggest industrial groups for the international railway market in the Balkans and the Middle East.

Between January and April 2010, solutions supplier and Bosch dealer Entegre Electronics from Istanbul designed and installed a public address and voice evacuation system at TÜDEMSAS, based around 50 Hemi-directional Loudspeakers from Bosch. The loudspeakers were installed in three buildings and cover around 50,000 m².

The public address and emergency evacuation system is controlled and managed from the factory's head office and security center. Business calls and emergency announcements can be made from both locations. The security center uses call stations with keypads. For the head office Entegre Electronics designed PC-based call stations with a graphical user interface that enable on-screen zone selection and both pre-recorded messages and live speech in the selected areas.

It's a full Audio over IP system. The three existing Praesideo systems installed in separate locations in the factory work together; both audio and contact information are distributed over the IP network. The factory's existing fiber-optic network configuration allowed optimal freedom in system design. It permitted the public address and voice evacuation equipment such as amplifiers, network controller, call stations and multi-channel interfaces to be located wherever required without having to install lots of additional cabling.

Powerful loudspeakers required
Bosch's Hemi-directional Loudspeaker has an innovative acoustic design that uses 14 specially positioned speaker drivers combined with advanced filtering to eliminate any flat spots in the frequency response. This gives consistent, high-quality sound reproduction over the whole coverage area and a broad frequency response over the audio range from around 60 Hz to over 17 kHz.

"The TÜDEMSAS factory is a very demanding environment," says Serhat Kacar, Project Manager, Entegre Electronics. "It's noisy, with average ambient noise levels around 85 dB, so Bosch's powerful Hemi-directional Loudspeakers are ideal. It's also a dirty, dusty and hot environment, so the ruggedness of these speakers is vital. The units are suspended from the 15-meter high ceilings with steel wires."

TÜDEMSAS management are very satisfied with the Bosch solution and in 2011 are planning to install Bosch's Hemi-directional Loudspeakers in two other factories.

Access control system
Entegre Electronics also installed a state-of-the-art access control system and CCTV solution from Bosch at the TÜDEMSAS factory. The video surveillance system consists of 5 day/night AutoDome 300 IP cameras with 36X optic zoom, 3 NightSense FlexiDome IP cameras and 8 channel DiBos IP software. The FlexiDome cameras and one of the PTZ cameras are installed at the main entrance while the others are installed on a tower in the middle of the campus for viewing the whole plant.

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