DNV approves BW-800 BNWAS

09 Nov 2010
The BW-800 bridge navigational watch alarm system

The BW-800 bridge navigational watch alarm system

The Copenhagen-based Uni-Safe Electronics has obtained a DNV type approval for their BNWAS BW-800 system.

This new bridge navigational watch alarm system (BNWAS) BW-800 complies with regulations from IMO: MSC.128 (75) and thenew IEC 62616 performance standard from February 2010.

Uni-Safe Electronics has successfully delivered more than 800 BNWAS systems. Currently, the company is expanding its agent network worldwide and is still looking for new business partners to help bring the BW-800 system as the no. 1 preferred BNWAS brand in the world.

The BW-800 has been tested according to specifications from the top ten classification societies.

From 1 July 2011 all new ships over 150gt and all new passenger ships have to be equipped with a BNWAS. The purpose of a BNWAS is to monitor bridge activity and detect operator disability which could lead to marine accidents. The system monitors the awareness of the officer of the watch (OOW) and automatically alerts the captain or another qualified OOW if for any reason the OOW becomes incapable of performing the OOW’s duties.

The BW-800 is delivered with a motion sensor as standard and normally one to three motion sensors are needed depending on the bridge design and size. The sensors detect motion on the bridge and reset the internal timer in the BNWAS. These units are installed to minimize stress for the officer on watch because he does not have to activate the reset unit every three minutes as long as he moves around regularly on the bridge. For safety reasons Uni-Safe Electronics has chosen to use a dual motion sensor with infrared and microwave detection in order to avoid a ‘non human’ motion to reset the timer and a single sensor is not suitable for BNWAS systems.

The system is also equipped with an Emergency call facility. If the officer on watch (OOW) needs assistance on the bridge, the BW-800 has an emergency call facility. If the reset unit is activated for more than 2 seconds, the back-up officer will be alerted immediately.

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