Feature sponsored by Test & measurement The transducer
features a thin-walled Inconel tube
contained within a sensor that uses the Pressductor technology to
measure changes in the cylinder pressure. These changes are measured and used by the autotuning system supplied by the engine designers.
Designed specifically to continuously monitor the performance of two stroke diesel engines in both marine and power plant applications, the transducers can continuously measure combustion pressures up to 250 bar at high temperatures to an accuracy of within 0.5 per cent. Compared to many standard membrane- based pressure transducers, the measurement performance of Cylmate transducers is not affected by any clogging or heat flash from combustion gases, enabling them to provide an accurate indication of the true cylinder pressure. To give some idea of the importance of enhanced accuracy on engine performance and fuel consumption, consider that a deviation of just 1.0 bar in Pmax pressure in a cylinder equates to 0.2 g/kWh SFOC (Specific Fuel Oil Consumption), potentially resulting in reduced fuel efficiency throughout the course of a voyage.
HIGH PERFORMANCE, REDUCED MAINTENANCE
HOW DO CYLMATE PRESSURE TRANSDUCERS WORK?
The Cylmate pressure transducer is based on the proven Pressductor magneto-elastic technology, which uses the mechanical forces that change the magnetic properties of a ferro- magnetic material to provide an induced voltage proportional to the applied force up to a given value. When attached to the cylinder’s indicator bore, the Cylmate pressure transducer can be used to provide a continuous overview throughout the complete combustion cycle.
A key benefit of Cylmate pressure transducers is their robust design and reduced maintenance requirement. With a blow-through design that simplifies the cleaning of combustion residues that could otherwise affect pressure measurement accuracy, the transducer can operate for long periods without maintenance. If maintenance is required for cleaning, the indicator valve mounted on the top of the transducer can be opened to allow the tube to be blown through. Furthermore, because Cylmate transducers have no components that can age or deteriorate and are unaffected by pressure or temperature cycling, combustion gases or combustion deposits, measurement performance can be maintained around the clock without the need for any recalibration. The reliability of ABB’s Cylmate combustion pressure transducers for large two-stroke diesel engines enables them to offer maintenance- and calibration-free performance during years of continuous operation. In many cases, transducers installed for over a decade are still in operation, with no deterioration in accuracy or performance. As further support, all Cylmate transducers also have a five-year warranty.
SUMMARY
The need for operators to improve vessel efficiency will increase as costs rise and regulations continue to get tighter. As this happens, operators will need technologies such
Instrumentation Monthly April 2023
as Cylmate to help them find ways to make their ships more fuel efficient and sustainable. By supplying a highly accurate pressure signal from each cylinder in real time to the governing auto tuning system provided by the engine designer, Cylmate ensures that the auto tuning is always tuning the engine with the correct pressure signal to achieve optimum performance. By maintaining a good engine balance, operators can ensure maximum combustion efficiency with minimum wear and tear, improving fuel efficiency, reducing maintenance, and staying compliant with emissions regulations.
ABB
www.abb.com 55
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