Why Monitor Onboard Environments?
A gap can exist between the automation of ship control and engine-room alarm systems and the comparatively lower level of automation for cabin-environment monitoring and fire warning. Continuous monitoring of onboard environmental conditions can support crew awareness, cabin comfort and operational safety.
The described solution uses a low-frequency 433 MHz wireless self-organizing network based on WBee. In this design, WBee provides A/D acquisition, I/O control and alarm functions, allowing sensor data and control information to be exchanged wirelessly.
Monitoring Areas and Parameters
Cargo Hold Monitoring
The cargo-hold monitoring arrangement in this design includes:
- Smoke sensors
- Temperature and humidity sensors
- Noise sensors
- Vibration sensors
- Methane sensors
WBee wireless acquisition and control terminals are used to collect the environmental parameters from the cargo hold.
Passenger Cabin Monitoring
Passenger-cabin monitoring includes smoke, temperature and humidity, and methane sensors. The system also includes a voice alarm device intended to support audible evacuation guidance in an emergency.
Engine Room Monitoring
The engine-room monitoring arrangement includes smoke, temperature and humidity, noise, vibration and methane sensors, working with WBee wireless acquisition and control terminals.
System Overview
The design is organized into three parts: a data acquisition and control layer, a wireless transmission layer, and a data monitoring centre. Sensors in different ship compartments connect to WBee nodes. The nodes communicate over a 433 MHz self-organizing wireless network, which carries measurement data and equipment-fault alarm information to the monitoring centre.
System Architecture
The architecture below distinguishes the three monitored ship zones, WBee field nodes, the 433 MHz self-organizing network and the monitoring-centre functions.
Wireless Network and Data Flow
The 2016 design uses a 433 MHz self-organizing network with automatic node formation and connection. Validate radio coverage, interference conditions and network capacity for the installation.
Permitted frequencies, power limits, duty-cycle rules and equipment approvals vary by country. Check the 433 MHz configuration against the requirements of the target market.
Monitoring Centre
The monitoring centre is described as comprising three main functions:
- Data acquisition and analysis
- Data storage
- Remote control and management
Operators can view and analyse current environmental parameters. The system also supports alarm handling, control of onboard safety equipment through WBee I/O, and voice evacuation support for passenger areas where configured.
System Functions
- Simplified installation by using wireless transmission instead of the original wired bus arrangement.
- Expandable network in which additional nodes are described as joining the self-organizing network automatically.
- Threshold-based alarms and I/O-triggered control of connected onboard safety equipment.
- A visual software interface for viewing data and using the expert diagnosis function to adjust cabin conditions.
WBee Device Reference
WBee is the acquisition and control terminal in this 2016 design, providing A/D acquisition, I/O control and alarm functions. Contact CAIMORE to discuss current equipment options.
Operational Value
- Monitor environmental conditions across cargo holds, passenger cabins and engine rooms.
- Reduce the amount of complex field wiring described in the original bus-based arrangement.
- Transmit sensor readings and fault alarms to a central monitoring point.
- Support threshold-based alarms and configured I/O control.
- Provide a visual interface for reviewing compartment conditions and supporting operator response.
This reference architecture dates from 2016. Confirm current equipment availability and applicable marine safety requirements for a new installation.
Discuss Your Shipboard Monitoring Project
If you are evaluating wireless environmental monitoring for cargo holds, passenger areas or engine rooms, contact CAIMORE to discuss sensor requirements, radio-frequency regulations, network design and the suitability of current hardware for your vessel.
Discuss your monitoring project