Features & Applications
Key features
- Full PAH Range – Full 0 – 4,500μg/L PAH phe eq measurement which provides full compatibility with all scrubber system flow rates
- Two year calibration intervals – allowing for uninterrupted monitoring
- Easy to use onboard sensor check – solid standards kit allows you to verify the sensor calibration onsite with easy to operate, robust and stable solid standards as part of the commissioning process, without the need for liquids or chemicals
- Compliant with current and upcoming IMO regulations
- Temperature compensated, referenced output
- High ambient light and turbidity rejection
- Robust and easy to clean
Applications
- Exhaust gas cleaning systems (EGCS) wash water monitoring systems
- Suitable for both new ship and retrofit installations
- Compatible with Open Loop and Hybrid systems
Operational support
- Training – Chelsea scientists and engineers provide training for integrators and operators of exhaust gas cleaning systems looking to integrate Chelsea sensors to their offering. Training can be provided online, remotely or onsite.
- Technical support – as designers and manufacturers of the PAH and turbidity sensors, Chelsea scientists and engineers can provide technical support and commissioning services.
- Spares provision – spare parts and sensors can be provided as an additional package and are available as needed from the UK headquarters
- Sensor calibration – comprehensive calibration services are provided by Chelsea calibration scientists on an ad hoc basis or under long term support contracts.
Specifications
| Measurement outputs | PAH phe eq (uncorrected) (µg/l), Absorbance (cm-1), Transmission (%), PMT eht (V), Error Code |
| Data output | Digital RS232 Option 2 x 4-20mA or RS422 |
| Operating temperature | -1 °C to + 55 °C |
| Input voltage | 9 to 36 Vdc |
| Power | <100 mA @ 15 V |
| Size | Ø 70 mm x 170 mm length (excluding connector) |
| Weight | 850 g in air |
| Pressure rating | 6 ba |
| Calibration interval | 2 year, return to Chelsea |
| Materials | Housing – rigid PVC |
PAH phe eq
| Measurement principle | Absorbance corrected fluorescence |
| Reported parameter | Polycyclic aromatic hydrocarbon in phenanthrene equivalence, PAH phe eq (uncorrected) |
| Units | µg/l |
| Dynamic range | 0 – 4500 µg/l, full MEPC range |
| Measurement sensitivity | 0.04 µg/l |
| Validation | Solid standard for on-site sensor check |
Absorbance
| Reported parameter | Absorbance |
| Units | Absorbance per unit path length (cm-1) |
| Dynamic range | 0 – 3.5 cm-1 |
| Sensitivity | 0.002 cm-1 |
| Validation | Solid standard for on-site sensor check |
Downloads
FAQs
Why monitor wash water?
Exhaust emissions from ships engines using heavy fuel oils release gases and particulates that can be detrimental to human health and the environment. To reduce this pollution the IMO established regulations through the Marine Environment Protection Committee (MEPC). Ships must now reduce nitrogen
dioxide (NOX), sulphur dioxide (SOX) and particulate emissions. To meet the sulphur limit for 2020 of 0.5% the shipping industry is implementing strategies, which includes installing Exhaust Gas Cleaning Systems (scrubbers) to neutralize the sulphur. Any discharge into the environment must be monitored to ensure nothing harmful is discharged. Ships need to fit monitoring systems and should ensure that it performs the full regulatory analysis, as required by the IMO, including PAH, pH, turbidity and temperature, to enable robust and accurate measurements are made in accordance with the regulatory requirements.
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