The DANELEC BMU-004 is a rugged, outdoor microphone designed to capture ambient sound from the bridge wings and other exposed areas of a vessel. It’s a key component of a Voyage Data Recorder (VDR) system, ensuring that external audio, such as communications, machinery sounds, or environmental noises, is continuously recorded. This audio data is crucial for accident investigation and compliance with maritime regulations (IMO/SOLAS). The unit is built to withstand harsh marine environments, typically featuring an IP66 water-resistant rating, internal amplification and filters for clear audio, and a self-test buzzer. It receives power directly from the VDR’s Data Acquisition Unit.
Technical Specification
General Specifications:
- Type: Outdoor Bridge Microphone Unit
- Part Number (P/N): 1302647 (commonly associated with BMU-004)
- Function: Captures ambient audio from outdoor bridge areas for VDR recording.
- Compatibility: Designed for Danelec VDR systems (e.g., DM100 series) and other IMO-compliant VDR systems.
- Power: Powered directly from the VDR’s Data Acquisition Unit (DAU).
Audio Specifications:
- Microphone Type: Omnidirectional (designed to pick up sound from all directions).
- Features:
- Built-in amplifier and filters to ensure clear audio recording.
- Designed for high speech clarity with noise filtering.
Environmental & Physical Specifications:
- IP Rating: IP66 water-resistant (Ingress Protection), meaning it is dust-tight and protected against powerful jets of water. This makes it suitable for exposed outdoor marine environments.
- Built-in Self-Test: Includes a built-in buzzer for self-test functions, allowing for verification of operational status.
- Mounting: Designed for bulkhead or ceiling mounting on the bridge.
- Housing: Compact and durable housing built for marine environments.
- Dimensions (W x H x D): Approximately 96 mm x 96 mm x 60 mm (This can vary slightly based on specific revisions, but these are common dimensions).
- Weight: Approximately 0.5 kg (lightweight for easy installation).
- Connectors: Uses standard marine-grade connectors for audio/data interface.
Compliance:
- IMO/SOLAS: Engineered to meet International Maritime Organization (IMO) and Safety of Life at Sea (SOLAS) regulations for VDR audio recording.
- Standards: Complies with relevant IEC standards (e.g., IEC 61996-1 Ed. 2 for VDRs).
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