The SM Electrics WMS 220.2.0.0 is a PIR (Passive Infrared) Motion Sensor primarily used as a component within a Bridge Navigational Watch Alarm System (BNWAS)
Core Function:
- Motion Detection: It detects movement within its specified area by sensing infrared energy emitted from moving objects (like a person).
- Automatic Countdown Reset: In a BNWAS, its main purpose is to automatically reset the countdown timer by detecting the movement of the Officer Of the Watch (OOW) on the bridge. This helps ensure continuous vigilance and prevents unnecessary alarms.
- Intelligent Sensor/Software: It’s designed to detect movement without being falsely triggered by typical ship movements, thanks to its intelligent sensor and integrated software.
Technical Specification
1. Sensor Type:
- Technology: Passive Infrared (PIR)
- Detection Method: Detects infrared energy (heat) emitted by moving objects.
2. Performance:
- Detection Area: 12 meters (39.4 feet)
- Detection Angle: 90°
- Detectable Walk Rate: 0.3 – 3.0 meters/sec (1 – 10 ft./sec) (Typical for similar sensors, ensuring accurate human movement detection)
- Response Time: Designed for quick response to OOW movement for BNWAS countdown reset.
- False Alarm Prevention:
- Intelligent microprocessor-based processing to differentiate human movement from ship’s motion.
- Prevention of insect access into housing.
- Immunity to white light (e.g., ≥6500 Lux).
- Temperature compensation circuit for reliable operation in varying temperatures.
3. Electrical:
- Power Supply: 12VDC nominal (This is consistently mentioned in product listings and often used for peripheral BNWAS components).
- Compatibility: Designed to integrate with SM Electrics BNWAS (Bridge Navigational Watch Alarm System), particularly the “le guardian 2025” series.
- Output: Provides a signal (likely a dry contact or similar) to the BNWAS control panel to reset the countdown timer.
4. Physical & Environmental:
- Kit Components: Typically includes the PIR sensor, a patch cable, a distribution box, and an electronic module.
- Mounting: Often designed for discreet installation within the bridge area.
- Operating Temperature: Typically -10°C to +50°C (standard for marine electronics).
- IP Rating: While not explicitly stated for the sensor itself, BNWAS components for bridge areas are generally designed for marine environments.
- Construction: Robust construction to withstand marine conditions.
- Tamper Protection: Built-in tamper-proof and self-test supervision functions.
5. System Integration & Compliance:
- BNWAS Role: Functions as a critical component for automatic countdown reset within the BNWAS to monitor OOW vigilance.
- Parallel Operation: Supports parallel operation of up to four WMS 220.2.0.0 sensor kits for increased coverage on larger bridges.
- Compliance: Designed to comply with international maritime standards for Bridge Navigational Watch Alarm Systems, such as:
- IMO Resolution MSC.128(75)
- IEC 62616
- Other relevant SOLAS regulations and classification society requirements (e.g., MED Type Approved, Wheel Mark certified).
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